USER FRIENDLY INTERFACE FOR CONTROL UNIT

[0001] This patent is a continuation-in-part of U.S. Ser. No. 13/033,573, filed Feb. 23, 2011. This patent application also claims the benefit of U.S. Prov. Ser. No. 61/415,771 filed Nov. 19, 2010; and of U.S. Prov. Ser. No. 61/429,093 filed Dec. 31, 2010, each of which is incorporated by reference herein. The subject matter of this patent specification also relates to the subject matter of the following commonly assigned applications: U.S. Ser. No. 12/881,430 filed Sep. 14, 2010; U.S. Ser. No. 12/881,463 filed Sep. 14, 2010; U.S. Ser. No. 12/984,602 filed Jan. 4, 2011; U.S. Ser. No. 12/987,257 filed Jan. 10, 2011; U.S. Ser. No. 13/033,573 and US. Ser. No. 29/386,021, filed Feb. 23, 2011; U.S. Ser. No. 13/034,666, U.S. Ser. No. 13/034,674 and U.S. Ser. No. 13/034,678 filed Feb. 24, 2011; U.S. Ser. No. 13/038,206 and U.S. Ser. No. 13/038,191 filed Mar. 1, 2011; U.S. Ser. No. 29/399,609 filed Aug. 16, 2011; U.S. Ser. No. 29/399,614 filed Aug. 16, 2011; U.S. Ser. No. 29/399,617 filed Aug. 16, 2011; U.S. Ser. No. 29/399,618 filed Aug. 16, 2011; U.S. Ser. No. 29/399,621 filed Aug. 16, 2011; U.S. Ser. No. 29/399,623 filed Aug. 16, 2011; U.S. Ser. No. 29/399,625 filed Aug. 16, 2011; U.S. Ser. No. 29/399,627 filed Aug. 16, 2011; U.S. Ser. No. 29/399,630 filed Aug. 16, 2011; U.S. Ser. No. 29/399,632 filed Aug. 16, 2011; U.S. Ser. No. 29/399,633 filed Aug. 16, 2011; U.S. Ser. No. 29/399,636 filed Aug. 16, 2011; U.S. Ser. No. 29/399,637 filed Aug. 16, 2011; U.S. Ser. No. 13/199,108 filed Aug. 17, 2011; and U.S. Ser. No. 13/267,877 and U.S. Ser. No. 13/267,871 filed Oct. 6, 2011. Each of the above-referenced patent applications is incorporated by reference herein. The above-referenced patent applications are collectively referenced hereinbelow as “the commonly assigned incorporated applications.”

[0002] This patent specification relates to systems, methods, and related computer program products for the monitoring and control of energy-consuming systems or other resource-consuming systems. More particularly, this patent specification relates to user interfaces for control units that govern the operation of energy-consuming systems, household devices, or other resource-consuming systems, including user interfaces for thermostats that govern the operation of heating, ventilation, and air conditioning (HVAC) systems.

[0003] While substantial effort and attention continues toward the development of newer and more sustainable energy supplies, the conservation of energy by increased energy efficiency remains crucial to the world's energy future. According to an October 2010 report from the U.S. Department of Energy, heating and cooling account for 56% of the energy use in a typical U.S. home, making it the largest energy expense for most homes. Along with improvements in the physical plant associated with home heating and cooling (e.g., improved insulation, higher efficiency furnaces), substantial increases in energy efficiency can be achieved by better control and regulation of home heating and cooling equipment. By activating heating, ventilation, and air conditioning (HVAC) equipment for judiciously selected time intervals and carefully chosen operating levels, substantial energy can be saved while at the same time keeping the living space suitably comfortable for its occupants.

[0004] Historically, however, most known HVAC thermostatic control systems have tended to fall into one of two opposing categories, neither of which is believed be optimal in most practical home environments. In a first category are many simple, non-programmable home thermostats, each typically consisting of a single mechanical or electrical dial for setting a desired temperature and a single HEAT-FAN-OFF-AC switch. While being easy to use for even the most unsophisticated occupant, any energy-saving control activity, such as adjusting the nighttime temperature or turning off all heating/cooling just before departing the home, must be performed manually by the user. As such, substantial energy-saving opportunities are often missed for all but the most vigilant users. Moreover, more advanced energy-saving capabilities are not provided, such as the ability for the thermostat to be programmed for less energy-intensive temperature setpoints (“setback temperatures”) during planned intervals of non-occupancy, and for more comfortable temperature setpoints during planned intervals of occupancy.

[0005] In a second category, on the other hand, are many programmable thermostats, which have become more prevalent in recent years in view of Energy Star (US) and TCO (Europe) standards, and which have progressed considerably in the number of different settings for an HVAC system that can be individually manipulated. Unfortunately, however, users are often intimidated by a dizzying array of switches and controls laid out in various configurations on the face of the thermostat or behind a panel door on the thermostat, and seldom adjust the manufacturer defaults to optimize their own energy usage. Thus, even though the installed programmable thermostats in a large number of homes are technologically capable of operating the HVAC equipment with energy-saving profiles, it is often the case that only the one-size-fits-all manufacturer default profiles are ever implemented in a large number of homes. Indeed, in an unfortunately large number of cases, a home user may permanently operate the unit in a “temporary” or “hold” mode, manually manipulating the displayed set temperature as if the unit were a simple, non-programmable thermostat.

[0006] Proposals have been made for so-called self-programming thermostats, including a proposal for establishing learned setpoints based on patterns of recent manual user setpoint entries as discussed in US20080191045A1, and including a proposal for automatic computation of a setback schedule based on sensed occupancy patterns in the home as discussed in G. Gao and K. Whitehouse, “The Self-Programming Thermostat: Optimizing Setback Schedules Based on Home Occupancy Patterns,” Proceedings of the First ACM Workshop on Embedded Sensing Systems for Energy-Efficiency in Buildings, pp. 67-72, Association for Computing Machinery (November 2009). It has been found, however, that crucial and substantial issues arise when it comes to the practical integration of self-programming behaviors into mainstream residential and/or business use, issues that appear unaddressed and unresolved in such self-programming thermostat proposals. By way of example, just as there are many users who are intimidated by dizzying arrays of controls on user-programmable thermostats, there are also many users who would be equally uncomfortable with a thermostat that fails to give the user a sense of control and self-determination over their own comfort, or that otherwise fails to give confidence to the user that their wishes are indeed being properly accepted and carried out at the proper times. At a more general level, because of the fact that human beings must inevitably be involved, there is a tension that arises between (i) the amount of energy-saving sophistication that can be offered by an HVAC control system, and (ii) the extent to which that energy-saving sophistication can be put to practical, everyday use in a large number of homes. Similar issues arise in the context of multi-unit apartment buildings, hotels, retail stores, office buildings, industrial buildings, and more generally any living space or work space having one or more HVAC systems. It has been found that the user interface of a thermostat, which so often seems to be an afterthought in known commercially available products, represents a crucial link in the successful integration of self-programming thermostats into widespread residential and business use, and that even subtle visual and tactile cues can make an large difference in whether those efforts are successful.

[0007] Thus, it would be desirable to provide a thermostat having an improved user interface that is simple, intuitive, elegant, and easy to use such that the typical user is able to access many of the energy-saving and comfort-maintaining features, while at the same time not being overwhelmed by the choices presented. It would be further desirable to provide a user interface for a self-programming or learning thermostat that provides a user setup and learning instantiation process that is relatively fast and easy to complete, while at the same time inspiring confidence in the user that their setpoint wishes will be properly respected. It would be still further desirable to provide a user interface for a self-programming or learning thermostat that provides convenient access to the results of the learning algorithms and methods for fast, intuitive alteration of scheduled setpoints including learned setpoints. It would be even further desirable to provide a user interface for a self-programming or learning thermostat that provides insightful feedback and encouragement regarding energy saving behaviors, performance, and/or results associated with the operation of the thermostat. Notably, although one or more of the embodiments described infra is particularly advantageous when incorporated with a self-programming or learning thermostat, it is to be appreciated that their incorporation into non-learning thermostats can be advantageous as well and is within the scope of the present teachings. Other issues arise as would be apparent to one skilled in the art upon reading the present disclosure.

[0008] Provided according to one or more embodiments is a user interface for a programmable device, such as a programmable thermostat, that controls the operation of one or more energy-consuming systems, household devices, or other resource-consuming systems, such as a heating, ventilation, and air conditioning (HVAC) system. Further provided are systems, methods, computer program products, and related business methods associated with the user interface and programmable device. For some embodiments, the programmable device is configured to carry out a method for interacting with a user thereof, the method comprising displaying a plurality of background tick marks arcuately arranged within a range area on a rounded display that is centrally mounted on a rounded body of the programmable device. A setpoint tick mark is displayed on the rounded display within the range area such that the setpoint tick mark is more prominently visible to the user than the background tick marks, the setpoint tick mark representing a setpoint temperature. Numerical representations of the current temperature and the setpoint temperature are displayed on the rounded display, and input representing a desired change in the setpoint temperature is received from the user by user rotation of a rotatable ring surrounding the rounded display. The setpoint tick mark is moved in response to and in accordance with the received input such that the change in setpoint is visible to the user.

[0009] According to some embodiments, a background color having a red and/or orange shade is displayed when the device is calling for heating, and a background color having a bluish shade is displayed when the device is calling for cooling. For some embodiments, the displayed intensities of the colors correspond to an estimated amount of heating or cooling that will be used to reach the setpoint temperature.

[0010] According to some embodiments, there is provided a programmable device for controlling the operation of an HVAC system, the programmable device being configured to carry out a method for interacting with a user thereof, the method comprising displaying a menu including a plurality of user selectable options in an arcuate area on a rounded display that is centrally mounted on a rounded body of the programmable device, and receiving input from the user by user rotation of a rotatable ring surrounding the rounded display. Different user selectable options are highlighted in response to and in accordance with the received input. The arcuate area is preferably a circular outer area of the rounded display disposed along a periphery thereof, and the plurality of user selectable options are distributed about the circular area and are rotated about the display in response to the received input. For some embodiments, a highlighting window preferably remains in a fixed position relative to the device while the plurality of user selectable options are progressively rotated through the window such that only one of the user selectable options at a time is visible within the window. The currently highlighted option can be selected by the user by pressing the rotatable ring.

[0011] According to some embodiments, there is provided a programmable device for controlling the operation of an HVAC system, the programmable device being configured to carry out a method for interacting with a user thereof, the method comprising displaying a visible portion of a schedule plot on an electronic display that is centrally mounted on a body of the programmable device, the schedule plot having a time axis and including a plurality of programmed setpoints disposed at respective locations along the time axis. The method further comprises receiving input from the user by user rotation of a rotatable ring surrounding the rounded display, and progressively changing the visible portion of the schedule plot display in response to the received input. A stationary cursor is preferably overlaid on the displayed visible portion of the schedule plot, the cursor being representative of a time value by virtue of its location along the time axis of the schedule plot. The schedule plot is preferably moved in a direction of the time axis relative to the stationary cursor such that a progression of time intervals is represented on the display as a function of the received user input. Each programmed setpoint has an effective time that is characterized by its location along the time axis, and further has a temperature value that is characterized by its location along a temperature axis of the schedule plot. For some embodiments, the time axis is disposed along a horizontal direction while the temperature axis is disposed along a vertical direction. New programmed setpoints can be established, and existing programmed setpoints can be adjusted in terms of their effective time and/or temperature values, by intuitive sequences of user pressing and user rotation of the rotatable ring. To establish a new programmed setpoint, the user rotates the rotatable ring until the stationary cursor is coincident with the desired effective time, presses the rotatable ring to establish a new setpoint at that time axis location, rotates the rotatable ring to adjust the temperature value of the new setpoint, and then presses the rotatable ring again to establish the programmed setpoint at that effective time and that temperature value. To adjust an existing programmed setpoint, the user rotates the rotatable ring until the stationary cursor is coincident with the effective time thereof, presses the rotatable ring to select that programmed setpoint, rotates the rotatable ring to adjust the time axis location, presses the rotatable ring to select the desired time location and allow adjustment of the temperature value, rotates the rotatable ring to adjust the temperature value, and again presses the rotatable ring to establish the new effective time and temperature value of the programmed setpoint.

[0012] According to some embodiments, a programmable device for controlling an HVAC system is provided. The device includes an electronic display positioned inside a circular outer ring that is user rotatable and user pressable, and a processor adapted and configured to drive the electronic display responsive to user presses and rotations of the outer ring. The processor is programmed to cause the electronic display to show recent energy usage performance information for a succession of recent historical time intervals. Energy performance information for respective time intervals can be displayed to the user in separate respective windows, the electronic display showing animated transitions between respective time intervals responsive to user rotations of the ring.

[0013] It will be appreciated that these systems and methods are novel, as are applications thereof and many of the components, systems, methods and algorithms employed and included therein. It should be appreciated that embodiments of the presently described inventive body of work can be implemented in numerous ways, including as processes, apparata, systems, devices, methods, computer readable media, computational algorithms, embedded or distributed software and/or as a combination thereof. Several illustrative embodiments are described below.

[0031] A detailed description of the inventive body of work is provided below. While several embodiments are described, it should be understood that the inventive body of work is not limited to any one embodiment, but instead encompasses numerous alternatives, modifications, and equivalents. In addition, while numerous specific details are set forth in the following description in order to provide a thorough understanding of the inventive body of work, some embodiments can be practiced without some or all of these details. Moreover, for the purpose of clarity, certain technical material that is known in the related art has not been described in detail in order to avoid unnecessarily obscuring the inventive body of work.

[0032] As used herein the term “HVAC” includes systems providing both heating and cooling, heating only, cooling only, as well as systems that provide other occupant comfort and/or conditioning functionality such as humidification, dehumidification and ventilation.

[0033] As used herein the terms power “harvesting,” “sharing” and “stealing” when referring to HVAC thermostats all refer to the thermostat are designed to derive power from the power transformer through the equipment load without using a direct or common wire source directly from the transformer.

[0034] As used herein the term “residential” when referring to an HVAC system means a type of HVAC system that is suitable to heat, cool and/or otherwise condition the interior of a building that is primarily used as a single family dwelling. An example of a cooling system that would be considered residential would have a cooling capacity of less than about 5 tons of refrigeration (1 ton of refrigeration=12,000 Btu/h).

[0035] As used herein the term “light commercial” when referring to an HVAC system means a type of HVAC system that is suitable to heat, cool and/or otherwise condition the interior of a building that is primarily used for commercial purposes, but is of a size and construction that a residential HVAC system is considered suitable. An example of a cooling system that would be considered residential would have a cooling capacity of less than about 5 tons of refrigeration.

[0036] As used herein the term “thermostat” means a device or system for regulating parameters such as temperature and/or humidity within at least a part of an enclosure. The term “thermostat” may include a control unit for a heating and/or cooling system or a component part of a heater or air conditioner. As used herein the term “thermostat” can also refer generally to a versatile sensing and control unit (VSCU unit) that is configured and adapted to provide sophisticated, customized, energy-saving HVAC control functionality while at the same time being visually appealing, non-intimidating, elegant to behold, and delightfully easy to use.

[0037] FIG. 1 is a diagram of an enclosure in which environmental conditions are controlled, according to some embodiments. Enclosure 100, in this example is a single-family dwelling. According to other embodiments, the enclosure can be, for example, a duplex, an apartment within an apartment building, a light commercial structure such as an office or retail store, or a structure or enclosure that is a combination of the above. Thermostat 110 controls HVAC system 120 as will be described in further detail below. According to some embodiments, the HVAC system 120 is has a cooling capacity less than about 5 tons. According to some embodiments, a remote device 112 wirelessly communicates with the thermostat 110 and can be used to display information to a user and to receive user input from the remote location of the device 112. Although many of the embodiments are described herein as being carried out by a thermostat such as thermostat 110, according to some embodiments, the same or similar techniques are employed using a remote device such as device 112.

[0038] FIG. 2 is a diagram of an HVAC system, according to some embodiments. HVAC system 120 provides heating, cooling, ventilation, and/or air handling for the enclosure, such as a single-family home 100 depicted in FIG. 1. The system 120 depicts a forced air type heating system, although according to other embodiments, other types of systems could be used. In heating, heating coils or elements 242 within air handler 240 provide a source of heat using electricity or gas via line 236. Cool air is drawn from the enclosure via return air duct 246 through filter 270, using fan 238 and is heated heating coils or elements 242. The heated air flows back into the enclosure at one or more locations via supply air duct system 252 and supply air grills such as grill 250. In cooling, an outside compressor 230 passes gas such a Freon through a set of heat exchanger coils to cool the gas. The gas then goes to the cooling coils 234 in the air handlers 240 where it expands, cools and cools the air being circulated through the enclosure via fan 238. According to some embodiments a humidifier 254 is also provided. Although not shown in FIG. 2, according to some embodiments the HVAC system has other known functionality such as venting air to and from the outside, and one or more dampers to control airflow within the duct systems. The system is controlled by control electronics 212 whose operation is governed by a thermostat such as the thermostat 110. Thermostat 110 controls the HVAC system 120 through a number of control circuits. Thermostat 110 also includes a processing system 260 such as a microprocessor that is adapted and programmed to controlling the HVAC system and to carry out the techniques described in detail herein.

[0039] FIGS. 3A-B illustrate a thermostat having a user-friendly interface, according to some embodiments. Unlike many prior art thermostats, thermostat 300 preferably has a sleek, simple, uncluttered and elegant design that does not detract from home decoration, and indeed can serve as a visually pleasing centerpiece for the immediate location in which it is installed. Moreover, user interaction with thermostat 300 is facilitated and greatly enhanced over known conventional thermostats by the design of thermostat 300. The thermostat 300 includes control circuitry and is electrically connected to an HVAC system, such as is shown with thermostat 110 in FIGS. 1 and 2. Thermostat 300 is wall mounted, is circular in shape, and has an outer rotatable ring 312 for receiving user input. Thermostat 300 is circular in shape in that it appears as a generally disk-like circular object when mounted on the wall. Thermostat 300 has a large front face lying inside the outer ring 312. According to some embodiments, thermostat 300 is approximately 80 mm in diameter. The outer rotatable ring 312 allows the user to make adjustments, such as selecting a new target temperature. For example, by rotating the outer ring 312 clockwise, the target temperature can be increased, and by rotating the outer ring 312 counter-clockwise, the target temperature can be decreased. The front face of the thermostat 300 comprises a clear cover 314 that according to some embodiments is polycarbonate, and a metallic portion 324 preferably having a number of slots formed therein as shown. According to some embodiments, the surface of cover 314 and metallic portion 324 form a common outward arc or spherical shape gently arcing outward, and this gentle arcing shape is continued by the outer ring 312.

[0040] Although being formed from a single lens-like piece of material such as polycarbonate, the cover 314 has two different regions or portions including an outer portion 314o and a central portion 314i. According to some embodiments, the cover 314 is painted or smoked around the outer portion 314o, but leaves the central portion 314i visibly clear so as to facilitate viewing of an electronic display 316 disposed thereunderneath. According to some embodiments, the curved cover 314 acts as a lens that tends to magnify the information being displayed in electronic display 316 to users. According to some embodiments the central electronic display 316 is a dot-matrix layout (individually addressable) such that arbitrary shapes can be generated, rather than being a segmented layout. According to some embodiments, a combination of dot-matrix layout and segmented layout is employed. According to some embodiments, central display 316 is a backlit color liquid crystal display (LCD). An example of information displayed on the electronic display 316 is illustrated in FIG. 3A, and includes central numerals 320 that are representative of a current setpoint temperature. According to some embodiments, metallic portion 324 has number of slot-like openings so as to facilitate the use of a passive infrared motion sensor 330 mounted therebeneath. The metallic portion 324 can alternatively be termed a metallic front grille portion. Further description of the metallic portion/front grille portion is provided in the commonly assigned U.S. Ser. No. 13/199,108, supra. The thermostat 300 is preferably constructed such that the electronic display 316 is at a fixed orientation and does not rotate with the outer ring 312, so that the electronic display 316 remains easily read by the user. For some embodiments, the cover 314 and metallic portion 324 also remain at a fixed orientation and do not rotate with the outer ring 312. According to one embodiment in which the diameter of the thermostat 300 is about 80 mm, the diameter of the electronic display 316 is about 45 mm. According to some embodiments an LED indicator 380 is positioned beneath portion 324 to act as a low-power-consuming indicator of certain status conditions. For, example the LED indicator 380 can be used to display blinking red when a rechargeable battery of the thermostat (see FIG. 4A, infra) is very low and is being recharged. More generally, the LED indicator 380 can be used for communicating one or more status codes or error codes by virtue of red color, green color, various combinations of red and green, various different blinking rates, and so forth, which can be useful for troubleshooting purposes.

[0041] Motion sensing as well as other techniques can be use used in the detection and/or predict of occupancy, as is described further in the commonly assigned U.S. Ser. No. 12/881,430, supra. According to some embodiments, occupancy information is used in generating an effective and efficient scheduled program. Preferably, an active proximity sensor 370A is provided to detect an approaching user by infrared light reflection, and an ambient light sensor 370B is provided to sense visible light. The proximity sensor 370A can be used to detect proximity in the range of about one meter so that the thermostat 300 can initiate “waking up” when the user is approaching the thermostat and prior to the user touching the thermostat. Such use of proximity sensing is useful for enhancing the user experience by being “ready” for interaction as soon as, or very soon after the user is ready to interact with the thermostat. Further, the wake-up-on-proximity functionality also allows for energy savings within the thermostat by “sleeping” when no user interaction is taking place our about to take place. The ambient light sensor 370B can be used for a variety of intelligence-gathering purposes, such as for facilitating confirmation of occupancy when sharp rising or falling edges are detected (because it is likely that there are occupants who are turning the lights on and off), and such as for detecting long term (e.g., 24-hour) patterns of ambient light intensity for confirming and/or automatically establishing the time of day.

[0042] According to some embodiments, for the combined purposes of inspiring user confidence and further promoting visual and functional elegance, the thermostat 300 is controlled by only two types of user input, the first being a rotation of the outer ring 312 as shown in FIG. 3A (referenced hereafter as a “rotate ring” or “ring rotation” input), and the second being an inward push on an outer cap 308 (see FIG. 3B) until an audible and/or tactile “click” occurs (referenced hereafter as an “inward click” or simply “click” input). For the embodiment of FIGS. 3A-3B, the outer cap 308 is an assembly that includes all of the outer ring 312, cover 314, electronic display 316, and metallic portion 324. When pressed inwardly by the user, the outer cap 308 travels inwardly by a small amount, such as 0.5 mm, against an interior metallic dome switch (not shown), and then springably travels back outwardly by that same amount when the inward pressure is released, providing a satisfying tactile “click” sensation to the user's hand, along with a corresponding gentle audible clicking sound. Thus, for the embodiment of FIGS. 3A-3B, an inward click can be achieved by direct pressing on the outer ring 312 itself, or by indirect pressing of the outer ring by virtue of providing inward pressure on the cover 314, metallic portion 314, or by various combinations thereof. For other embodiments, the thermostat 300 can be mechanically configured such that only the outer ring 312 travels inwardly for the inward click input, while the cover 314 and metallic portion 324 remain motionless. It is to be appreciated that a variety of different selections and combinations of the particular mechanical elements that will travel inwardly to achieve the “inward click” input are within the scope of the present teachings, whether it be the outer ring 312 itself, some part of the cover 314, or some combination thereof. However, it has been found particularly advantageous to provide the user with an ability to quickly go back and forth between registering “ring rotations” and “inward clicks” with a single hand and with minimal amount of time and effort involved, and so the ability to provide an inward click directly by pressing the outer ring 312 has been found particularly advantageous, since the user's fingers do not need to be lifted out of contact with the device, or slid along its surface, in order to go between ring rotations and inward clicks. Moreover, by virtue of the strategic placement of the electronic display 316 centrally inside the rotatable ring 312, a further advantage is provided in that the user can naturally focus their attention on the electronic display throughout the input process, right in the middle of where their hand is performing its functions. The combination of intuitive outer ring rotation, especially as applied to (but not limited to) the changing of a thermostat's setpoint temperature, conveniently folded together with the satisfying physical sensation of inward clicking, together with accommodating natural focus on the electronic display in the central midst of their fingers' activity, adds significantly to an intuitive, seamless, and downright fun user experience. Further descriptions of advantageous mechanical user-interfaces and related designs, which are employed according to some embodiments, can be found in U.S. Ser. No. 13/033,573, supra, U.S. Ser. No. 29/386,021, supra, and U.S. Ser. No. 13/199,108, supra.

[0043] FIG. 3C illustrates a cross-sectional view of a shell portion 309 of a frame of the thermostat of FIGS. 3A-B, which has been found to provide a particularly pleasing and adaptable visual appearance of the overall thermostat 300 when viewed against a variety of different wall colors and wall textures in a variety of different home environments and home settings. While the thermostat itself will functionally adapt to the user's schedule as described herein and in one or more of the commonly assigned incorporated applications, supra, the outer shell portion 309 is specially configured to convey a “chameleon” quality or characteristic such that the overall device appears to naturally blend in, in a visual and decorative sense, with many of the most common wall colors and wall textures found in home and business environments, at least in part because it will appear to assume the surrounding colors and even textures when viewed from many different angles. The shell portion 309 has the shape of a frustum that is gently curved when viewed in cross-section, and comprises a sidewall 376 that is made of a clear solid material, such as polycarbonate plastic. The sidewall 376 is backpainted with a substantially flat silver- or nickel-colored paint, the paint being applied to an inside surface 378 of the sidewall 376 but not to an outside surface 377 thereof. The outside surface 377 is smooth and glossy but is not painted. The sidewall 376 can have a thickness T of about 1.5 mm, a diameter dl of about 78.8 mm at a first end that is nearer to the wall when mounted, and a diameter d2 of about 81.2 mm at a second end that is farther from the wall when mounted, the diameter change taking place across an outward width dimension “h” of about 22.5 mm, the diameter change taking place in either a linear fashion or, more preferably, a slightly nonlinear fashion with increasing outward distance to form a slightly curved shape when viewed in profile, as shown in FIG. 3C. The outer ring 312 of outer cap 308 is preferably constructed to match the diameter d2 where disposed near the second end of the shell portion 309 across a modestly sized gap gltherefrom, and then to gently arc back inwardly to meet the cover 314 across a small gap g2. It is to be appreciated, of course, that FIG. 3C only illustrates the outer shell portion 309 of the thermostat 300, and that there are many electronic components internal thereto that are omitted from FIG. 3C for clarity of presentation, such electronic components being described further hereinbelow and/or in other ones of the commonly assigned incorporated applications, such as U.S. Ser. No. 13/199,108, supra.

[0044] According to some embodiments, the thermostat 300 includes a processing system 360, display driver 364 and a wireless communications system 366. The processing system 360 is adapted to cause the display driver 364 and display area 316 to display information to the user, and to receiver user input via the rotatable ring 312. The processing system 360, according to some embodiments, is capable of carrying out the governance of the operation of thermostat 300 including the user interface features described herein. The processing system 360 is further programmed and configured to carry out other operations as described further hereinbelow and/or in other ones of the commonly assigned incorporated applications. For example, processing system 360 is further programmed and configured to maintain and update a thermodynamic model for the enclosure in which the HVAC system is installed, such as described in U.S. Ser. No. 12/881,463, supra. According to some embodiments, the wireless communications system 366 is used to communicate with devices such as personal computers and/or other thermostats or HVAC system components, which can be peer-to-peer communications, communications through one or more servers located on a private network, or and/or communications through a cloud-based service.

[0045] FIG. 4 illustrates a side view of the thermostat 300 including a head unit 410 and a backplate (or wall dock) 440 thereof for ease of installation, configuration and upgrading, according to some embodiments. As is described hereinabove, thermostat 300 is wall mounted and has circular in shape and has an outer rotatable ring 312 for receiving user input. Head unit 410 includes the outer cap 308 that includes the cover 314 and electronic display 316. Head unit 410 of round thermostat 300 is slidably mountable onto back plate 440 and slidably detachable therefrom. According to some embodiments the connection of the head unit 410 to backplate 440 can be accomplished using magnets, bayonet, latches and catches, tabs or ribs with matching indentations, or simply friction on mating portions of the head unit 410 and backplate 440. According to some embodiments, the head unit 410 includes a processing system 360, display driver 364 and a wireless communications system 366. Also shown is a rechargeable battery 420 that is recharged using recharging circuitry 422 that uses power from backplate that is either obtained via power harvesting (also referred to as power stealing and/or power sharing) from the HVAC system control circuit(s) or from a common wire, if available, as described in further detail in co-pending patent application U.S. Ser. Nos. 13/034,674, and 13/034,678, which are incorporated by reference herein. According to some embodiments, rechargeable battery 420 is a single cell lithium-ion, or a lithium-polymer battery.

[0046] Backplate 440 includes electronics 482 and a temperature/humidity sensor 484 in housing 460, which are ventilated via vents 442. Two or more temperature sensors (not shown) are also located in the head unit 410 and cooperate to acquire reliable and accurate room temperature data. Wire connectors 470 are provided to allow for connection to HVAC system wires. Connection terminal 480 provides electrical connections between the head unit 410 and backplate 440. Backplate electronics 482 also includes power sharing circuitry for sensing and harvesting power available power from the HVAC system circuitry.

[0047] FIGS. 5A-F and 6A-D are display output flow diagrams illustrating a user-friendly graphical user interface for a programmable thermostat upon initial set up, according to some embodiments. The initial setup flow takes place, for example, when the thermostat 300 is removed from the box for the first time, or after a factory default reset instruction is made. The screens shown, according to some embodiments, are displayed on the thermostat 300 on round dot-matrix electronic display 316 having a rotatable ring 312, such as shown and described supra with respect to FIGS. 3A-4. In FIG. 5A, the thermostat 300 with electronic display 316 shows a logo screen 510 upon initial startup. The logo screen 510 adds a spinner icon513 in screen 512 to indicate to the user that the boot up process is progressing. According to some embodiments, information such as to inform the user of aspects of the thermostat 300 or aspects of the manufacturer is displayed to the user during the booting process. After booting, the screen 514 is displayed to inform the used that the initial setup process may take a few minutes. The user acknowledges the message by an inward click command, after which screen 516 is displayed. Screen 516 allows the user to select, via the rotatable ring, one of four setup steps. According to some embodiments, the user is not allowed to select the order of the set up steps, but rather the list of four steps is shown so that the user has an indication of current progress within the setup process. According to some preferred embodiments, the user can select either the next step in the progression, or any step that has already been completed (so as to allow re-doing of steps), but is not allowed to select a future step out of order (so as to prevent the user from inadvertently skipping any steps). According to one embodiment, the future steps that are not allowed yet are shown in a more transparent (or “greyed”) color so as to indicate their current unavailability. In this case a click leads to screen 518, which asks the user to connect to the internet to establish and/or confirm their unique cloud-based service account for features such as remote control, automatic updates and local weather information.

[0048] According to some embodiments, the transitions between some screens use a “coin flip” transition, and/or a translation or shifting of displayed elements as described in U.S. patent application Ser. No. 13/033,573, supra. The animated “coin flip” transition between progressions of thermostat display screens, which is also illustrated in the commonly assigned U.S. Ser. No. 29/399,625, supra, has been found to be advantageous in providing a pleasing and satisfying user experience, not only in terms of intrinsic visual delight, but also because it provides a unique balance between logical segregation (a sense that one is moving on to something new) and logical flow (a sense of connectedness and causation between the previous screen and the next screen). Although the type of transitions may not all be labeled in the figures herein, it is understood that different types of screen-to-screen transitions could be used so as to enhance the user interface experience for example by indicating to the user a transition to a different step or setting, or a return to a previous screen or menu.

[0049] In screen 518, the user proceeds to the connection setup steps by selecting “CONNECT” with the rotatable ring followed by an inward click. Selecting “CONNECT” causes the thermostat 300 to scan for wireless networks and then to display screen 524 in FIG. 5B. If the user selects “SKIP,” then screen 520 is displayed, which informs the user that they can connect at any time from the settings menu. The user acknowledges this by clicking, which leads to screen 522. In screen 522, the first step “Internet Connection” is greyed out, which indicates that this step has been intentionally skipped.

[0050] In FIG. 5B, screen 524 is shown after a scan is made for wireless networks (e.g. using Wi-Fi or ZigBee wireless communication). In the example shown in screen 524, two wireless networks have been found and are displayed: “Network2” and “Network3.” The electronic display 316 preferably also includes a lock icon 526 to show that the network uses password security, and also can show a wireless icon 528 to indicate the wireless connection to the network. According to some embodiments, wireless signal icon 528 can show a number of bars that indicates relative signal strength associated with that network. If the user selects one of the found networks that requires a password, screen 530 is displayed to obtain the password from the user. Screen 530 uses an alphanumeric input interface where the user selects and enters characters by rotating the ring and clicking. Further details of this type of data entry interface is described in the commonly assigned U.S. Ser. No. 13/033,573, supra. The user is reminded that a password is being entered by virtue of the lock icon 526. After the password is entered, screen 532 is displayed while the thermostat tries to establish a connection to the indicated Wi-Fi network. If the network connection is established and the internet is available, then the thermostat attempts to connect to the manufacturer's server. A successful connection to the server is shown in screen 534. After a pause (or a click to acknowledge) screen 536 is displayed that indicates that the internet connection setup step has been successfully completed. According to some embodiments, a checkmark icon 537 is used to indicate successful completion of the step.

[0051] If no connection to the selected local network could be established, screen 538 is displayed notifying the user of such and asking if a network testing procedure should be carried out. If the user selects “TEST,” then screen 540, with a spinner icon 541, is displayed while a network test is carried out. If the test discovers an error, a screen such as screen 542 is displayed to indicate the nature of the errors. According to some embodiments, the user is directed to further resources online for more detailed support.

[0052] If the local network connection was successful, but no connection to the manufacturer's server could be established then, in FIG. 5C, screen 544, the user is notified of the status and acknowledges by clicking “CONTINUE.” In screen 546, the user is asked if they wish to try a different network. If the user selects “NETWORK,” then the thermostat scans for available networks and then moves to screen 524. If the user selects “SKIP,” then screen 522 is displayed.

[0053] Under some circumstances, for example following a network test (screen 540) the system determines that a software and/or firmware update is needed. In such cases, screen 548 is displayed while the update process is carried out. Since some processes, such as downloading and installing updates, can take a relatively long time, a notice combined with a spinner 549 having a percent indicator can be shown to keep the user informed of the progress. Following the update, the system usually needs to be rebooted. Screen 550 informs the user of this.

[0054] According to some embodiments, in cases where more than one thermostat is located in the same dwelling or business location, the units can be associated with one another as both being paired to the user's account on a cloud-based management server. When a successful network and server connection is established (screen 534), and if the server notes that there is already an online account associated with the current location by comparison of a network address of the thermostat 300 with that of other currently registered thermostats, then screen 552 is displayed, asking the user if they want to add the current thermostat to the existing account. If the user selects “ADD,” the thermostat is added to the existing account as shown in screens 554 and 556. After adding the current thermostat to the online account. If there is more than one thermostat on the account a procedure is offered to copy settings, beginning with screen 558. In FIG. 5D, screen 558 notifies the user that another thermostat, in this case named “Living Room,” is also associated with the user's account, and asks the user if the settings should be copies. If the user selects “COPY SETTINGS” then the screen 560 is displayed with a spinner 561 while settings are copied to the new thermostat. According to some embodiments, one or more of the following settings are copied: account pairing, learning preferences (e.g. “learning on” or “learning off”), heating or cooling mode (if feasible), location, setup interview answers, current schedule and off-season schedule (if any).

[0055] Advantageous functionalities can be provided by two different instances of the thermostat unit 300 located in a common enclosure, such as a family home, that are associated with a same user account in the cloud-based management server, such as the account “[email protected]” in FIGS. 5C-5D. For purposes of the present description it can be presumed that each thermostat is a “primary” thermostat characterized in that it is connected to an HVAC system and is responsible for controlling that HVAC system, which can be distinguished from an “auxiliary” thermostat having many of the same sensing and processing capabilities of the thermostat 300 except that an “auxiliary” thermostat does not connect to an HVAC system, but rather influences the operation of one or more HVAC systems by virtue of its direct or indirect communication with one or more primary thermostats. However, the scope of the present disclosure is not so limited, and thus in other embodiments there can be cooperation among various combinations of primary and/or auxiliary thermostats.

[0056] A particular enclosure, such as a family home, can use two primary thermostats 300 where there are two different HVAC systems to control, such as a downstairs HVAC system located on a downstairs floor and an upstairs HVAC system located on an upstairs floor. Where the thermostats have become logically associated with a same user account at the cloud-based management server, such as by operation of the screens 552, 554, 556, the two thermostats advantageously cooperate with one another in providing optimal HVAC control of the enclosure as a whole. Such cooperation between the two thermostats can be direct peer-to-peer cooperation, or can be supervised cooperation in which the central cloud-based management server supervises them as one or more of a master, referee, mediator, arbitrator, and/or messenger on behalf of the two thermostats. In one example, an enhanced auto-away capability is provided, wherein an “away” mode of operation is invoked only if both of the thermostats have sensed a lack of activity for a requisite period of time. For one embodiment, each thermostat will send an away-state “vote” to the management server if it has detected inactivity for the requisite period, but will not go into an “away” state until it receives permission to do so from the management server. In the meantime, each thermostat will send a revocation of its away-state vote if it detects occupancy activity in the enclosure. The central management server will send away-state permission to both thermostats only if there are current away-state votes from each of them. Once in the collective away-state, if either thermostat senses occupancy activity, that thermostat will send a revocation to the cloud-based management server, which in turn will send away-state permission revocation (or an “arrival” command) to both of the thermostats. Many other types of cooperation among the commonly paired thermostats (i.e., thermostats associated with the same account at the management server) can be provided without departing from the scope of the present teachings.

[0057] Where there is more than one thermostat for a particular enclosure and those thermostats are associated with the same account on the cloud-based management server, one preferred method by which that group of thermostats can cooperate to provide enhanced auto-away functionality is as follows. Each thermostat maintains a group state information object that includes (i) a local auto-away-ready (AAR) flag that reflects whether that individual thermostat considers itself to be auto-away ready, and (ii) one or more peer auto-away-ready (AAR) flags that reflect whether each other thermostat in the group considers itself to be auto-away ready. The local AAR flag for each thermostat appears as a peer AAR flag in the group state information object of each other thermostat in the group. Each thermostat is permitted to change its own local AAR flag, but is only permitted to read its peer AAR flags. It is a collective function of the central cloud-based management server and the thermostats to communicate often enough such that the group state information object in each thermostat is maintained with fresh information, and in particular that the peer AAR flags are kept fresh. This can be achieved, for example, by programming each thermostat to immediately communicate any change in its local AAR flag to the management server, at which time the management server can communicate that change immediately with each other thermostat in the group to update the corresponding peer AAR flag. Other methods of direct peer-to-peer communication among the thermostats can also be used without departing from the scope of the present teachings.

[0058] According to a preferred embodiment, the thermostats operate in a consensus mode such that each thermostat will only enter into an actual “away” state if all of the AAR flags for the group are set to “yes” or “ready”. Therefore, at any particular point in time, either all of the thermostats in the group will be in an “away” state, or none of them will be in the “away” state. In turn, each thermostat is configured and programmed to set its AAR flag to “yes” if either or both of two sets of criteria are met. The first set of criteria is met when all of the following are true: (i) there has been a period of sensed inactivity for a requisite inactivity interval according to that thermostat's sensors such as its passive infrared (PIR) motion sensors, active infrared proximity sensors (PROX), and other occupancy sensors with which it may be equipped; (ii) the thermostat is “auto-away confident” in that it has previously qualified itself as being capable of sensing statistically meaningful occupant activity at a statistically sufficient number of meaningful times, and (iii) other basic “reasonableness criteria” for going into an auto-away mode are met, such as (a) the auto-away function was not previously disabled by the user, (b) the time is between 8 AM and 8 PM if the enclosure is not a business, (c) the thermostat is not in OFF mode, (d) the “away” state temperature is more energy-efficient than the current setpoint temperature, and (e) the user is not interacting with the thermostat remotely through the cloud-based management server. The second set of criteria is met when all of the following are true: (i) there has been a period of sensed inactivity for a requisite inactivity interval according to that thermostat's sensors, (ii) the AAR flag of at least one other thermostat in the group is “yes”, and (iii) the above-described “reasonableness” criteria are all met. Advantageously, by special virtue of the second set of alternative criteria by which an individual thermostat can set its AAR flag to “yes”, it can be the case that all of the thermostats in the group can contribute the benefits of their occupancy sensor data to the group auto-away determination, even where one or more of them are not “auto-away confident,” as long as there is at least one member that is “auto-away confident.” This method has been found to increase both the reliability and scalability of the energy-saving auto-away feature, with reliability being enhanced by virtue of multiple sensor locations around the enclosure, and with scalability being enhanced in that the “misplacement” of one thermostat (for example, installed at an awkward location behind a barrier that limits PIR sensitivity) causing that thermostat to be “away non-confident” will not jeopardize the effectiveness or applicability of the group consensus as a whole.

[0059] It is to be appreciated that the above-described method is readily extended to the case where there are multiple primary thermostats and/or multiple auxiliary thermostats. It is to be further appreciated that, as the term primary thermostat is used herein, it is not required that there be a one-to-one correspondence between primary thermostats and distinct HVAC systems in the enclosure. For example, there are many installations in which plural “zones” in the enclosure may be served by a single HVAC system by virtue of controllable dampers that can stop and/or redirect airflow to and among the different zones from the HVAC system. In such cases, there can be a primary thermostat for each zone, each of the primary thermostats being wired to the HVAC system as well as to the appropriate dampers to regulate the climate of its respective zone.

[0060] Referring now again to FIG. 5D, in screen 562 a name is entered for the thermostat, assuming the thermostat is being installed in a dwelling rather than in a business. The list of choices 563 is larger than the screen allows, so according to some embodiments the list 563 scrolls up and down responsive to user ring rotation so the user can view all the available choices. For purposes of clarity of description, it is to be appreciated that when a listing of menu choices is illustrated in the drawings of the present disclosure as going beyond the spatial limits of a screen, such as shown with listing 563 of screen 562, those menu choices will automatically scroll up and down as necessary to be viewable by the user as they rotate the rotatable ring 312. The available choices of names in this case are shown, including an option to enter a custom name (by selecting “TYPE NAME”). The first entry “Nest 2” is a generic thermostat name, and assumes there is already a thermostat on the account named “Nest 1.” If there already is a “Nest 2” thermostat then the name “Nest 3” will be offered, and so on. If the user selects “TYPE NAME,” then a character entry user interface 565 is used to enter a name. Screen 564 shows a thermostat naming screen analogous to screen 562 except that is represents a case in which the thermostat 300 is being installed in a business rather than a dwelling. Screen 566 is displayed when thermostat learning (or self-programing) features are turned “on.” In this case the user is asked if the current schedule from the other thermostat should be copied. Screens 568, 570 and 572 show what is displayed after completion of the Internet connection, server connection and pairing procedures are completed. Screen 568 is used in the case there an Internet connection is established, but no pairing is made with a user account on the server. Screen 570 is used in the case where both an Internet connection and pairing the user's account on the server is established. Finally, screen 572 is used in the case where no internet connection was successfully established. In all cases the next setup topic is “Heating and Cooling.”

[0061] FIG. 5E shows example screens, according to some embodiments, for a thermostat that has the capability to detect wiring status and errors, such as described in the commonly assigned U.S. Ser. No. 13/034,666, supra, by detecting both the physical presence of a wire connected to the terminal, as well as using an analog-to-digital converter (ADC) to sense the presence of appropriate electrical signals on the connected wire. According to some embodiments, the combination of physical wire presence detection and ADC appropriate signal detection can be used to detect wiring conditions such as errors, for example by detecting whether the signal on an inserted wire is fully energized, or half-rectified. Screen 574 is an example when no wiring warnings or errors are detected. According to some preferred embodiments, the connectors that have wires attached are shown in a different color and additionally small wire stubs, such as stub 575, are shown indicating to the user that a wire is connected to that connector terminal. According to some preferred embodiments, the wire stubs, such as stub 575, are shown in a color that corresponds to the most common wire color that is found in the expected installation environment. For example, in the case of screen 574, the wire stub for connector R_H is red, the wire stub for connector Y₁ is yellow, the wire stub for connector G is green and so on. Screen 578 is an example of a wiring warning indication screen. In general a wiring warning is used when potential wiring problem is detected, but HVAC functionality is not blocked. In this case, a cooling wire Y1 is detected but no cooling system appears to be present, as notified to the user in screen 579. Other examples of wiring warnings, according to some embodiments, include: Rh pin detected (i.e., the insertion of a wire into the Rh terminal has been detected) but that Rh wire is not live; Rc pin detected but Rc wire not live; W1 pin detected but W1 wire not live; AUX pin detected but AUX wire not live; G pin detected but G wire not live; and OB pin detected but OB wire not live. Screen 580 is an example of a wiring error indication screen. In general, wiring errors are detected problems that are serious enough such that HVAC functionality is blocked. In this case the wiring error shown in screen 580 is the absence of detected power wires (i.e., neither Rc nor Rh wires are detected), as shown in screen 582. In screen 584, the user is asked to confirm that the heating or cooling system is connected properly, after which the system shuts down as indicated by the blank (or black) screen 585. Other examples of wiring errors, according to some embodiments, include: neither a Y1 nor a W1 pin has been detected; C pin detected but that C wire is not live; Y1 pin has been detected but that Y1 wire is not live; and a C wire is required (i.e., an automated power stealing test has been performed in which it has been found that the power stealing circuitry in thermostat 300 will undesirably cause one or more HVAC call relays to trip, and so power stealing cannot be used in this installation, and therefore it is required that a C wire be provided to the thermostat 300).

[0062] FIG. 5F show user interface screens relating to location and time/date, according to some embodiments. Screen 586 shows an example of the electronic display 316 when the first two steps of the setup process are completed. Upon user selection of “Your location” screen 588 is displayed to notify the user that a few questions should be answered to create a starting schedule. In screen 590, the user's location country is identified. Note that the list of countries in this example is only USA and Canada, but in general other or larger lists of countries could be used. Screen 592 shows an example of a fixed length character entry field, in this case, entry of a numerical five-digit United States ZIP code. The use rotates the rotatable ring 312 (see FIG. 3A, supra) to change the value of the highlighted character, followed by a click to select that value. Screen 594 shows an example after all five digits have been entered. Screen 596 shows an example of a screen that is used if the thermostat is not connected to the Internet, for entering date and time information. According to some embodiments, the time and date entry are only displayed when the clock has been reset to the firmware default values.

[0063] FIG. 6A shows example user interface screens of setup interview questions for the user to answer, according to some embodiments. The screens shown, according to some embodiments, are displayed on a thermostat 300 on round dot-matrix electronic display 316 having a rotating ring 312 such as shown and described in FIGS. 3A-4. Screen 600 shows the setup steps screen that is displayed once the first three steps have been completed. Note that if one of the steps has not been successful, a “−” symbol can be marked instead of a check mark. For example, if the internet connection was not made or skipped, a minus symbol “−” precedes the internet step. If “Your Home” is selected, screen 602 asks the user if the thermostat is being installed in a home or business. If “HOME” is selected, a number of questions 604 can be asked to aid in establishing a basic schedule for the user. Following the interview questions, in screen 608, the user is asked to give the thermostat a name. Notably, the step 608 is only carried out if there was not already a name requested previously (see FIG. 5D, step 562), that is, if the thermostat currently being setup is not the first such thermostat being associated with the user's cloud-based service account. A list of common names 607 is displayed for the user to choose by scrolling via the rotatable ring. The user can also select “TYPE NAME” to enter a custom name via character input interface 609. If the indicates that the thermostat is being installed in a business, then a set of interview questions 606 can be presented to aid in establishing a basic schedule. Following questions 606, the user is asked to give the thermostat a name in an analogous fashion as described in the case of a home installation.

[0064] FIG. 6B shows further interview questions associated with an initial setup procedure, according to some embodiments. Following the thermostat naming, in screen 610, the user is asked if electric heat is used in the home or business. According to some embodiments, the heating questions shown are only asked if a wire is connected to the “W1” and/or “W2” terminals. In screen 612, the user is asked if forced-air heating is used. Screen 614 informs the user that a testing procedure is being carried out in the case where a heat-pump heating system is used. For example, the test could be to determine proper polarity for the heat pump control system by activating the system and detecting resulting temperature changes, as described in the commonly assigned U.S. Ser. No. 13/038,191, supra. Screen 616 shows an example displayed to the user to inform the user that a relatively long procedure is being carried out. According to some embodiments, the heat pump test is not carried out if the user is able to correctly answer questions relating to the polarity of the heat pump system. Screen 620 show an example of where all the setup steps are successfully completed. If the user selects “FINISH” a summary screen 622 of the installation is displayed, indicating the installed HVAC equipment.

[0065] FIG. 6C shows screens relating to learning algorithms, in the case such algorithms are being used. In screen 630 the user is informed that their subsequent manual temperature adjustments will be used to train or “teach” the thermostat. In screen 632, the user is asked to select between whether the thermostat 300 should enter into a heating mode (for example, if it is currently winter time) or a cooling mode (for example, if it is currently summer time). If “COOLING” is selected, then in screen 636 the user is asked to set the “away” cooling temperature, that is, a low-energy-using cooling temperature that should be maintained when the home or business is unoccupied, in order to save energy and/or money. According to some embodiments, the default value offered to the user is 80 degrees F., the maximum value selectable by the user is 90 degrees F., the minimum value selectable is 75 degrees F., and a “leaf” (or other suitable indicator) is displayed when the user selects a value of at least 83 degrees F. Screen 640 shows an example of the display shown when the user is going to select 80 degrees F. (no leaf is displayed), while screen 638 shows an example of the display shown when the user is going to select 84 degrees F. According to some embodiments, a schedule is then created while the screen 642 is displayed to the user.

[0066] If the user selects “HEATING” at screen 632, then in screen 644 the user is asked to set a low-energy-using “away” heating temperature that should be maintained when the home or business is unoccupied. According to some embodiments the default value offered to the user is 65 degrees F., the maximum value selectable by the user is 75 degrees F., the minimum value selectable is 55 degrees F., and a “leaf” (or other suitable energy-savings-encouragement indicator) is displayed when the user selects a value below 63 degrees F. Screens 646 and 648 show examples of the user inputting 63 and 62 degrees respectively. According to some embodiments, a schedule is then created while the screen 642 is displayed to the user.

[0067] FIG. 6D shows certain setup screens, according to some preferred embodiments. According to some embodiments, screen 650 displays the first three setup steps completed, and a fourth step, “Temperature” that has not yet been completed. If “TEMPERATURE” is selected, then in screen 652, the user is asked if heating or cooling is currently being used at this time of year. In screen 654, the user is asked to input the energy saving heating and cooling temperatures to be maintained in the case the home or business is unoccupied.

[0068] FIGS. 7A-7K show aspects of a general layout of a graphical user interface for a thermostat, according to some embodiments. The screens shown, according to some embodiments, are displayed on a thermostat 300 on round dot-matrix electronic display 316 having a rotatable ring 312 such as shown and described in FIGS. 3A-4. FIG. 7A shows a basic thermostat screen 700 in heating mode. According to some embodiments, the foreground symbols and characters remain a constant color such as white, while the background color of the screen can vary according to thermostat and HVAC system function to provide an intuitive visual indication thereof. For example, according to a preferred embodiment, a background orange-red color (e.g. R/G/B values: 231/68/0) is used to indicate that the thermostat is currently calling for heating from the HVAC system, and a background blueish color (e.g., R/G/B values: 0/65/226) is used to indicate that the thermostat is currently calling for cooling from the HVAC system. Further, according to some embodiments, the intensity, hue, saturation, opacity or transparency of the background color can be changed to indicate how much heating and/or cooling will be required (or how “hard” the HVAC system will have to work) to achieve the current setpoint. For example, according to some preferred embodiments, a black background is used when the HVAC system is not activated (i.e., when neither heating or cooling is being called for), while a selected background color that represents heat (e.g., orange, red, or reddish-orange) is used if the setpoint temperature is at least 5 degrees F. higher than the current ambient temperature, and while a selected background color that represents cooling (e.g., blue) is used if the setpoint temperature is at least 5 degrees F. lower than the current ambient temperature. Further, according to preferred embodiments, the color can be faded or transitioned between the neutral color (black) and the HVAC active color (red-orange for heating or blue for cooling) to indicate the increasing amount of “work” the HVAC system must do to change the ambient temperature to reach the current setpoint. For example, according to some preferred embodiments, decreasing levels of transparency (i.e., an increasing visibility or “loudness” of the HVAC active color) are used to correspond to increasing discrepancy between the current ambient temperature and the setpoint temperature. Thus, as the discrepancy between the setpoint temperature and the current ambient temperature increases from 1 to 5 degrees, the “loudness” of the background HVAC active color increases from an almost completely transparent overlay on the black background to a completely non-transparent “loud” heating or cooling color. It has been found that the use of variations in color display, such as described, can be extremely useful in giving the user a “feel” for the amount of work, and therefore the amount of energy and cost, that is going to be expended by the HVAC system at the currently displayed setpoint value. This, in turn, can be extremely useful in saving energy, particularly when the user is manually adjusting the setpoint temperature in real time, because the background color provides an immediate feedback relating to the energy consequences of the user's temperature setting behavior.

[0069] According to some alternate embodiments, parameters other than simply the difference in current to setpoint temperature can be used in displaying background colors and intensity. For example, time-to-temp (the estimated amount of time it will take to reach the current setpoint temperature), amount of energy, and/or cost, if accurately known can also be used alone or in combination determine which color and how intense (or opaque) is used for the background of the thermostat display.

[0070] According to some preferred embodiments the characters and other graphics are mainly displayed in white overlying the black, orange or blue backgrounds as described above. Other colors for certain displayed features, such green for the “leaf” logo are also used according to some embodiments. Although many of the screens shown and described herein are provided in the accompanying drawings with black characters and graphics overlaying a white background for purposes of clarity and print reproduction, it is to be understood that the use of white or colored graphics and characters over black and colored backgrounds such is generally preferable for enhancing the user experience, particularly for embodiments where the electronic display 316 is a backlit dot matrix LCD display similar to those used on handheld smartphones and touchpad computers. Notably, although the presently described color schemes have been found to be particularly effective, it is to be appreciated that the scope of the present teachings is not necessarily so limited, and that other impactful schemes could be developed for other types of known or hereinafter developed electronic display technologies (e.g., e-ink, electronic paper displays, organic LED displays, etc.) in view of the present description without departing from the scope of the present teachings.

[0071] In FIG. 7A, screen 700 has a red-orange background color with white central numerals 720 indicating the current setpoint of 72 degrees F. The current setpoint of 72 degrees is also shown by the large tick mark 714. The current ambient temperature is 70 degrees as shown by the small numerals 718 and the tick mark 716. Other tick marks in a circular arrangement are shown in a more transparent (or more muted) white color, to give the user a sense of the range of adjustments and temperatures, in keeping with the circular design of the thermostat, display area and rotatable ring. According to some embodiments, the circular arrangement of background tick marks are sized and spaced apart so that 180 tick marks would complete a circle, but 40 tick marks are skipped at the bottom, such that a maximum of 140 tick marks are displayed. The setpoint tick mark 714 and the current temperature tick mark 716 may replace some the of the background tick marks such that not all of the background tick marks are displayed. Additionally, the current temperature is displayed numerically using numerals 718 which can also be overlaid, or displayed in muted or transparent fashion over the background tick marks. According to some embodiments, so as to accentuate visibility the setpoint tick mark 714 is displayed in 100% opacity (or 0% transparency), is sized such that it extends 20% farther towards the display center than the background tick marks, and is further emphasized by the adjacent background tick marks not being displayed. According to some embodiments, a time-to-temperature display 722 is used to indicate the estimated time needed to reach the current setpoint, as is described more fully co-pending commonly assigned patent application U.S. Ser. No. 12/984,602. FIG. 7B shows a screen 701, which displays a “HEAT TO” message 724 indicating that the HVAC system is in heating mode, although currently is not active (“HEATING” will be displayed when the HVAC system is active). According to some embodiments, the background color of screen 701 is a neutral color such as black. A fan logo 730 can be displayed indicating the fan is active without any associated heating or cooling. Further, a lock icon 732 can be displayed when the thermostat is locked. FIG. 7C shows a screen 702 which has the message 726 “COOLING” indicating that cooling is being called for, in addition to a background color such as blue. In this case, the message 726 “COOLING” is displayed instead of the time-to-temp display since there may be low confidence in the time-to-temp number may (such as due to insufficient data for a more accurate estimation). In FIG. 7D, screen 703 shows an example similar to screen 702, but with the time-to-temp 728 displayed instead of message 726, indicating that there is a higher confidence in the time-to-temp estimation. Note that the background color of screen 702 and 703 are bluish so as to indicate HVAC cooling is active, although the color may be partially muted or partially transparent since the current setpoint temperature and current ambient temperature is relatively close.

[0072] According to some embodiments, to facilitate the protection of compressor equipment from damage, such as with conventional cooling compressors or with heat pump heating compressors, the thermostat prevents re-activation of a compressor within a specified time period (“lockout period”) from de-activation, so as to avoid compressor damage that can occur if the de-activation to re-activation interval is too short. For example, the thermostat can be programmed to prevent re-activation of the compressor within a lockout interval of 2 minutes after de-activation, regardless of what happens with the current ambient temperature and/or current setpoint temperature within that lockout interval. Longer or shorter lockout periods can be provided, with 2 minutes being just one example of a typical lockout period. During this lockout period, according to some embodiments, a message such as message 762 in screen 704 of FIG. 7E is displayed, which provides a visually observable countdown until the end of the lockout interval, so as to keep the user informed and avoid confusion on the user's part as to why the compressor has not yet started up again.

[0073] According to some embodiments, a manual setpoint change will be active until an effective time of the next programmed setpoint. For example, if at 2:38 PM the user walks up to the thermostat 300 and rotates the outer ring 312 (see FIG. 3A, supra) to manually adjust the setpoint to 68 degrees F., and if the thermostat 300 has a programmed schedule containing a setpoint that is supposed to take effect at 4:30 PM with a setpoint temperature that is different than 68 degrees F., then the manual setpoint temperature change will only be effective until 4:30 PM. According to some embodiments, a message such as message 766 (“till 4:30 PM”) will be displayed on screen 705 in FIG. 7F, which informs the user that their setpoint of 68 degrees F. will be in effect until 4:30 PM.

[0074] FIG. 7G shows an example screen 706 in which a message “HEAT TO” is displayed, which indicates that the thermostat 300 is in heating mode but that the heating system is not currently active (i.e., heat is not being called for by the thermostat). In this example, the current temperature, 70 degrees F., is already higher than the setpoint of 68 degrees F., so an active heating call is not necessary. Note that screen 706 is shown with a black background with white characters and graphics, to show an example of the preferred color scheme. FIG. 7H shows an example screen 707 in which a message 724 “COOL TO” is displayed, which indicates that the cooling system is in cooling mode but is not currently active (i.e. cooling is not being called for by the thermostat). In this example, the current temperature, 70 degrees F., is already lower than the setpoint of 68 degrees F., so an active cooling call is not necessary. This case is analogous to FIG. 7G except that the system is in cooling mode.

[0075] FIG. 7I shows an example screen 708 where the thermostat has manually been set to “AWAY” mode (e.g., the user has walked up to the thermostat dial and invoked an “AWAY” state using user interface features to be described further infra), which can be performed by the user when a period of expected non-occupancy is about to occur. The display 708 includes a large “AWAY” icon or text indicator 750 along with a leaf icon 740. Note that the current temperature numerals 718 and tick mark 716 continue to be displayed. During the away mode, the thermostat uses an energy-saving setpoint according to default or user-input values (see, for example, screens 638 and 648 of FIG. 6C and screen 654 of FIG. 6D, supra). According to some embodiments, if the user manually initiates an “away” mode (as opposed to the thermostat automatically detecting non-occupancy) then the thermostat will only come out of “away” mode by an explicit manual user input, such as by manually using the user interface. In other words, when manual “away” mode is activated by the user, then the thermostat will not use “auto arrival” to return to standard operation, but rather the user must manually establish his/her re-arrival. In contrast, when the thermostat has automatically entered into an away state based on occupancy sensor data that indicates non-occupancy for a certain period of time (see FIG. 7J and accompanying text below), then the thermostat will exit the “away” state based on either of (i) occupancy sensor data indicating that occupants have returned, or (ii) an explicit manual user input.

[0076] FIG. 7J shows an example screen 709 where the thermostat has automatically entered into an “AWAY” mode (referred to as “AUTO AWAY” mode), as indicated by the message 752 and icon 750, based on an automatically sensed state of non-occupancy for a certain period of time. Note that according to some embodiments, the leaf icon 740 is always displayed during away modes (auto or manual) to indicate that the away modes are energy-saving modes. Such display of leaf icon 740 has been found advantageous at this point, because it is reassuring to the user that something green, something good, something positive and beneficial, is going on in terms of energy-savings by virtue of the “away” display. According to some embodiments, the leaf icon 740 is also displayed when the thermostat is in an “OFF” mode, such as shown in example screen 710 in FIG. 7K, because energy is inherently being saved through non-use of the HVAC system. Notably, the “OFF” mode is actually one of the working, operational modes of the thermostat 300, and is to be distinguished from a non-operational or “dead” state of the thermostat 300. In the “OFF” mode, the thermostat 300 will still acquire sensor data, communicate wirelessly with a central server, and so forth, but will simply not send heating or cooling calls (or other operating calls such as humidification or dehumidification) to the HVAC system. The “OFF” mode can be invoked responsive to an explicit menu selection by the user, either through the rotatable ring 312 (see screen 814 of FIG. 8C, infra), or from a network command received via the Wi-Fi capability from a cloud-based server that provides a web browser screen or smartphone user interface to the user and receives an OFF command thereby. As illustrated in FIG. 7K, the current temperature numerals 718 and current temperature tick mark 716 are preferably displayed along with the leaf 740 when the thermostat is in “OFF” mode. In alternative embodiments, background tick marks can also be displayed in “OFF” mode.

[0077] According to a preferred embodiment, all of the operational screens of the thermostat 300 described herein that correspond to normal everyday operations, such as the screens of FIGS. 7A-7K, will actually only appear when the proximity sensor 370A (see FIG. 3A, supra) indicates the presence of a user or occupant in relatively close proximity (e.g., 50 cm-200 cm or closer) to the thermostat 300, and the electronic display 316 will otherwise be dark. While the user is proximal to the thermostat 300 the electronic display 316 will remain active, and when the user walks away out of proximity the electronic display 316 will remain active for a predetermined period of time, such as 20 seconds, and then will go dark. In contrast to an alternative of keeping the electronic display 316 active all of the time, this selective turn-on and turn-off of the electronic display has been found to be a preferable method of operation for several reasons, including the savings of electrical power that would otherwise be needed for an always-on electronic display 316, extension of the hardware life of the electronic display 316, and also aesthetic reasons for domestic installations. The savings of electrical power is particularly advantageous for installations in which there is no “C” wire provided by the HVAC system, since it will often be the case that the average power that can safely obtained from power-stealing methods will be less than the average power used by a visually pleasing hardware implementation of the electronic display 316 when active. Advantageously, by designing the thermostat 300 with the rechargeable battery 482 and programming its operation such that the electronic display 316 will only be active when there is a proximal viewer, the electronic display 316 itself can be selected and sized to be bright, bold, informative, and visually pleasing, even where such operation takes more instantaneous average electrical power than the power stealing can provide, because the rechargeable battery 482 can be used to provide the excess power needed for active display, and then can be recharged during periods of lesser power usage when the display is not active. This is to be contrasted with many known prior art electronic thermostats whose displays are made very low-power and less visually pleasing in order to keep the thermostat's instantaneous power usage at budget power-stealing levels. Notably, it is also consistent with the aesthetics of many home environments not to have a bright and bold display on at all times, such as for cases in which the thermostat is located in a bedroom, or in a media viewing room such as a television room. The screens of FIGS. 7A-7K can be considered as the “main” display for thermostat 300 in that these are the screens that are most often shown to the user as they walk up to the thermostat 300 in correspondence with normal everyday operation.

[0078] According to one embodiment, the thermostat 300 is programmed and configured such that, upon the detection of a working “C” wire at device installation and setup, the user is automatically provided with a menu choice during the setup interview (and then revised later at any time through the settings menu) whether they would like the electronic display 316 to be on all the time, or only upon detection of a proximal user. If a “C” wire is not detected, that menu choice is not provided. A variety of alternative display activation choices can also be provided, such as allowing the user to set an active-display timeout interval (e.g., how long the display remains active after the user has walked away), allowing the user to choose a functionality similar to night lighting or safety lighting (i.e., upon detection of darkness in the room by the ambient light sensor 370B, the display will be always-on), and other useful functionalities. According to yet another embodiment, if the presence of a “C” wire is not detected, the thermostat 300 will automatically test the power stealing circuitry to see how much power can be tapped without tripping the call relay(s), and if that amount is greater than a certain threshold, then the display activation menu choices are provided, but if that amount is less than the certain threshold, the display activation menu choices are not provided.

[0079] FIGS. 8A-C show example screens of a rotating main menu, according to some preferred embodiments. The screens shown, according to some embodiments, are displayed on a thermostat 300 on a round dot-matrix electronic display 316 having a rotatable ring 312 such as shown and described in FIGS. 3A-4. FIG. 8A shows an example screen 800 in normal operations (such as described in FIG. 7A or 7C). An inward click from the normal display screen 800 causes a circumferential main menu 820 to appear as shown in screen 801. In this example the main menu 820 displays about the perimeter of the circular display area various menu names such as “SETTINGS,” “ENERGY,” “SCHEDULE,” “AWAY,” “DONE,” as well one or more icons. The top of the circular menu 820 includes an active window 822 that shows the user which menu item will be selected if an inward click is performed at that time. Upon user rotation of the rotatable ring 312 (see FIG. 3A, supra) the menu items turn clockwise or counter clockwise, matching the direction of the rotatable ring 312, so as to allow different menu items to be selected. For example, screen 802 and 804 show examples displayed in response to a clockwise rotation of the rotatable ring 312. One example of a rotating menu that rotates responsive to ring rotations according to some embodiments is illustrated in the commonly assigned U.S. Ser. No. 29/399,632, supra. From screen 804, if an inward click is performed by the user, then the Settings menu is entered. It has been found that a circular rotating menu such as shown, when combined with a rotatable ring and round display area, allows for highly intuitive and easy input, and so therefore greatly enhances the user interface experience for many users. FIG. 8B shows an example screen 806 that allows for the schedule mode to be entered. FIG. 8C shows the selection of a mode icon 809 representing a heating/cooling/off mode screen, the mode icon 809 comprising two disks 810 and 812 and causing the display of a mode menu if it appears in the active window 822 when the user makes an inward click. In screen 808, a small blue disk 810 represents cooling mode and a small orange-red disk 812 represents heating mode. According to some embodiments the colors of the disks 810 and 812 match the background colors used for the thermostat as described with respect to FIG. 7A. One of the disks, in this case the heating disk 812 is highlighted with a colored outline, to indicate the current operating mode (i.e. heating or cooling) of the thermostat. In one alternative embodiment, the mode icon 809 can be replaced with the text string “HEAT/COOL/OFF” or simply the word “MODE”. If in inward click is performed from screen 808, a menu screen 814 appears (e.g. using a “coin flip” transition). In screen 814 the user can view the current mode (marked with a check mark) and select another mode, such as “COOL” or “OFF.” If “COOL” is selected then the thermostat will change over to cooling mode (such changeover as might be performed in the springtime), and the cooling disk icon will highlighted on screens 814 and 808. The menu can also be used to turn the thermostat off by selecting “OFF.” In cases the connected HVAC system only has heating or cooling but not both, the words “HEAT” or “COOL” or “OFF” are displayed on the menu 820 instead of the colored disks.

[0080] FIGS. 9A-J and 10A-I illustrate example user interface screens for making various settings, according to some embodiments. The screens shown, according to some embodiments, are displayed on a thermostat 300 on round dot-matrix electronic display 316 having a rotatable ring 312 such as shown and described in FIGS. 3A-4. In FIG. 9A, screen 900 is initially displayed following a user selection of “SETTINGS” from the main menu, such as shown in screen 804 of FIG. 8A. The general layout of the settings menu in this example is a series of sub-menus that are navigated using the rotatable ring 312. For example, with reference to FIG. 9A, the user can cause the initial screen 900 to be shifted or translated to the left by a clockwise rotation of the rotatable ring 312, as shown in the succession of screens 902 and 908. The animated translation or shifting effect is illustrated in FIG. 9A by virtue of a portion of the previous screen disk 901 and a portion of the new screen disk 906 shifting as shown, and is similar to the animated shifting translation illustrated in the commonly assigned U.S. Ser. No. 29/399,621, supra. Further rotation of the ring leads to successive sub-menu items such as “system on” screen 912, and lock setting screen 916 (see FIG. 9B). Rotating the ring in the opposite direction, i.e., counterclockwise, translates or shifts the screens in the opposite direction (e.g., from 916 to 908 to 900). The “initial screen” 900 is thus also used as a way to exit the settings menu by an inward click. This exit function is also identified by the “DONE” label on the screen 900. Note that inner disk 901 shows the large central numerals that correspond to the current setpoint temperature and can include a background color to match the thermostat background color scheme as described with respect to FIG. 7A, so as to indicate to a user, in an intuitive way, that this screen 900 is a way of exiting the menu and going “back” to the main thermostat display, such as shown in FIGS. 7A-K. According to some embodiments, another initial/done screen such as screen 900 is displayed at the other end (the far end) of the settings menu, so as to allow means of exit from the settings menu from either end. According to some embodiments, the sub-menus are repeated with continued rotation in one direction, so that they cycle through in a circular fashion and thus any sub menu can eventually be accessed by rotating the ring continuously in either one of the two directions.

[0081] Screen 908 has a central disk 906 indicating the name of the sub-menu, in this case the Fan mode. Some sub menus only contain a few options which can be selected or toggled among by inward clicking alone. For example, the Fan sub-menu 908 only has two settings “automatic” (shown in screen 908) and “always on” (shown in screen 910). In this case the fan mode is changed by inward clicking, which simply toggles between the two available options. Ring rotation shifts to the next (or previous) settings sub-menu item. Thus rotating the ring from the fan sub-menu shift to the system on/off sub-menu shown in screens 912 (in the case of system “ON”) and 914 (in the case of system “OFF”). The system on/off sub-menu is another example of simply toggling between the two available options using the inward click user input.

[0082] In FIG. 9B, screen 916 is the top level of the lock sub-menu. If the thermostat is connected and paired (i.e., has Internet access and is appropriately paired with a user account on a cloud-based server), an inward click will lead to screen 918. At screen 918, the user can vary the highlighting between the displayed selections by rotating the rotatable ring 312, and then can select the currently displayed menu item by inward clicking the rotatable ring 312. If “LOCKED” is selected then the user is asked to enter a locking PIN in screen 920. If the thermostat is already locked then screen 925 is displayed instead of screen 916. If the thermostat is unlocked then a PIN confirmation is requested such as in screen 922. If the confirmation PIN does not match then the user is asked to enter a new PIN in screen 924. If the confirmation PIN matches, then the temperature limits are set in screens 938 and/or 939 in FIG. 9C. The described locking capability can be useful in a variety of contexts, such as where a parent desires the limit the ability of their teenager to set the temperature too high in winter or too low in summer. According to some embodiments, locking of the thermostat is not permitted if the thermostat is not connected to the Internet or is not paired to an account, so that an online backup method of unlocking the thermostat is available should the user forget the PIN number. In such case, if the thermostat is not connected to the Internet, then screen 926 is displayed, and if the thermostat is not paired then screen 927 is displayed.

[0083] FIG. 9C shows further details of the locking feature, according to some embodiments. In screen 938 the user is allowed to set the minimum setpoint temperature using the rotatable ring followed by an inward click (in the case where a cooling system is present). Screen 939 similarly allows the user to set the maximum setpoint temperature (when a heating system is present). After setting the limits in screens 938 and/or 939 a coin flip transition returns to the main thermostat operation screen such as shown in screen 940. In the case shown in screen 940, a maximum setpoint of 73 degrees F. has been input. A lock icon 946 is displayed on the dial to notify the user that a maximum setpoint temperature has been set for the heating system. Screens 941, 942, 943, 944 and 945 show the behavior of the thermostat when locked, according to some embodiments. In this example, the user is trying to adjust the setpoint temperature above the maximum of 73 degrees. In screen 943 the user is asked for the PIN. If the PIN is incorrect, then the thermostat remains locked as shown in screen 944. If the PIN is correct the thermostat is unlocked and lock icon is removed as shown in screen 945, in which case the user can then proceed to change the current setpoint above 73 degrees F.

[0084] FIG. 9D shows a sub-menu for settings and information relating to learning, according to some preferred embodiments. Screen 928 displays a learning sub-menu disk 928a which, when entered into by inward clicking, leads to screen 929. From screen 929 four different options can be selected. If “SCHEDULE learning” is selected, then in screen 930 the user is notified of how long the learning algorithm has been active (in the example shown, learning has been active for three days). If the user selects “PAUSE LEARNING” then learning is paused, which is reflected in the screen 931. If the user selects “AUTO-AWAY training” then the user is notified of the auto-away function in screen 932. By clicking to continue, the user is asked if the auto away feature should be active in screen 933. If the user selects “SET TEMP.” then in screen 934 the user can input the energy-saving temperatures to be used when the home or business is non-occupied, these temperatures being applicable upon either an automatically invoked or a manually invoked away condition. In an alternative embodiment (not shown), the user is able to enter different temperature limits for the automatically invoked away condition versus the manually invoked away condition. According to some embodiments an energy saving icon, such as the leaf icon, is displayed next to the temperatures in screen 934 if those selected temperatures conforms to energy-saving standards or other desirable energy-saving behavior. If the user selects “YES” from screen 933 then the user is notified of the confidence status of the activity/occupancy sensor used for automated auto-away invocation. Screen 935 is an example showing that the activity sensor confidence is too low for the auto-away feature (the automated auto-away invocation) based on to be effective. Screen 937 is an example of a screen shown when the activity/occupancy sensor is “in training” and the progress in percentage is displayed. If and when the activity/occupancy sensor confidence is high enough for the auto-away function to be effective, then another message (not shown) is displayed to notify the user of such. Screen 936 is an example of information displayed to the user pertaining to the leaf icon and is accessed by selecting the leaf icon from the screen 929.

[0085] FIG. 9E shows settings sub-menus for learning and for auto-away, according to some alternate embodiments. Screens 950-958 show alternative screens to those shown in FIG. 9D. Upon clicking at the screen 950, in screen 951 the user is asked if learning should be activated based on the user's adjustments, and if yes, then in screen 952 the user is informed that the thermostat will automatically adjust the program schedule based on the user's manual temperature adjustments. In screen 953 the user is notified of how long the learning feature has been active (if applicable). In screen 954 the user is notified that learning cannot be activated due to a conflict with another setting (in this case, the use of a RANGE mode of operation in which both upper and lower setpoint temperatures are enforced by the thermostat).

[0086] Upon user ring rotation at screen 950, screen 955 is displayed which allows entry to the auto-away sub-menu. Screen 956 asks if the auto-away feature should be active. Screen 957 notifies the user about the auto-away feature. Screen 958 is an example showing the user the status of training and/or confidence in the occupancy sensors. Other examples instead of screen 958 include “TOO LOW FOR AUTO-AWAY” and “ENOUGH FOR AUTO-AWAY,” as appropriate.

[0087] FIG. 9F shows sub-menu screen examples for settings for brightness, click sounds and Celsius/Fahrenheit units, according to some embodiments. Screens 960, 961, 962 and 963 toggle among four different brightness settings using the inward click input as shown in FIG. 9F. Specifically, the settings for auto-brightness, low, medium and high can be selected. According to some embodiments, the brightness of the display is changed to match the current selection so as to aid the user in selecting an appropriate brightness setting. Screens 964 and 965 toggle between providing, and not providing, audible clicking sounds as the user rotates the rotatable ring 312, which is a form of sensory feedback that some users prefer and other users do not prefer. Screens 966 and 967 are used to toggle between Celsius and Fahrenheit units, according to some embodiments. According to some embodiments, if Celsius units is selected, then half-degrees are displayed by the thermostat when numerical temperature is provided (for example, a succession of 21, 21⁵, 22, 22⁵, 23, 23⁵, and so forth in an example in which the user is turning up the rotatable ring on the main thermostat display). According to another embodiment, there is another sub-menu screen disk (not shown) that is equivalent to the “Brightness” and “Click Sound” disks in the menu hierarchy, and which bears one of the two labels “SCREEN ON when you approach” and “SCREEN ON when you press,” the user being able to toggle between these two options by an inward click when this disk is displayed. When the “SCREEN ON when you approach” is active, the proximity sensor-based activation of the electronic display screen 316 is provided (as described above with the description accompanying FIG. 8C), whereas when the “SCREEN ON when you press” option is selected, the electronic display screen 316 does not turn on unless there is a ring rotation or inward click.

[0088] FIG. 9G shows a sub menu for entering or modifying a name for the thermostat, according to some embodiments. Clicking on screen 968 leads to either screen 969 in the case of a home installation or screen 970 in the case of a business installation. In screens 969 and 970 several common names are offered, along with the option of entering a custom name. If “TYPE NAME” is selected from either screen a character input interface 971 is presented through which the user can enter a custom name. The newly selected (or inputted) name for the thermostat is displayed in the central disk as shown in screen 972.

[0089] FIG. 9H shows sub-menu screens relating to network connection, according to some embodiments. In FIG. 9H, screen 974 shows a network sub menu disk 974a showing the current connected network name, in this case “Network2.” The wireless symbol next to the network name indicates that the wireless connection to that network is currently active. Clicking leads to screen 975 which allows the user to select a different wireless network if available (in this case there is another available network called “Network3”), disconnect or obtain technical network details. If “TECH. DETAILS” is selected then screen 976 is displayed which, by scrolling using the rotatable ring 312, the user can view various technical network details such as shown in the list 977. If a different network is selected from screen 975, then the user is prompted to enter a security password (if applicable) using interface 978, after which a connection attempt is made while screen 979 is displayed. If the connection is successful, then screen 980 is displayed.

[0090] FIG. 10A shows settings screens relating to location and time, according to some embodiments. Screen 1000 shows a sub-menu disk 1000a having the currently assigned zip code (or postal code). Clicking leads to screen 1002 for selecting the country. Selecting the country (e.g. “USA”) provides the appropriate ZIP code/postal code format for the following screen. In this case “USA” is selected and the ZIP code is entered on screens 1004 and 1006. Screen 1008 shows a sub-menu disk 1008a having the current time and date. Clicking when the thermostat is connected to the Internet and in communication with the associated cloud-based server automatically sets the time and date as shown in screen 1010. If the thermostat is not connected to the Internet, clicking leads to screen 1012 in which the user can manually enter the time, date and daylight savings time information.

[0091] FIG. 10B shows settings screens relating to technical and legal information, according to some embodiments. Screen 1014 shows a sub-menu disk 1014a bearing the TECHNICAL INFO moniker, whereupon clicking on screen 1014 leads to screen 1016 which displays a long list 1018 of technical information which is viewed by scrolling via the rotatable ring 312. Similarly, screen 1020 shows a sub-menu disk 1020a bearing the LEGAL INFO moniker, whereupon clicking on screen 1020 leads to screen 1022 which displays various legal information.

[0092] FIGS. 10C and 10D show settings screens relating to wiring and installation, according to some embodiments. In FIG. 10C, screen 1024 shows a sub-menu disk 1024a the provides entry to the wiring settings sub-menu. If no wiring warnings or errors are detected then the wiring is considered “good wiring” and a click displays screen 1026 which shows the connection terminals having the wires connected and the HVAC functionality related to each. This screen is analogous to screen 574 shown in FIG. 5E. According to some embodiments, the wiring and installation settings sub-menu can also perform testing. For example, screen 1028 asks the user if an automatic test of the heating and cooling equipment should be undertaken. Screen 1029 shows an example screen during the automatic testing process when the first item, the fan, is being tested. If the fan test returns satisfactory results (screen 1030) the next testing step is carried out, in this case cooling, with a checkmark next to the word “Fan” notifying the user of the successful completion of the fan test. Screen 1032 shows an example screen where all of the automatic tests have been successfully completed (for an installation that includes a fan, heating, cooling and auxiliary heating). Screen 1034 shows an example of a failed automatic test, in this case the fan test, and asks the user if a wiring change should be made. In screen 1036 the user can elect to continue with the other testing steps, and screen 1038 shows an example of the completion of the testing where one of the steps had an error or test failure (in this case the fan test).

[0093] In FIG. 10D, screen 1040 shows an example of a wiring warning, which is denoted by a yellow or otherwise highlighted disk next to the connector terminal label “cool”. An inward click input leads to an explanation of the warning, in this case being an error in which there is a wire insertion detected at terminal Y1 but no electronic signature consistent with a cooling system can be sensed. Note that the wiring warning shown in this example is not serious enough to block operation. However, some wiring errors are serious enough such that HVAC operation is blocked. An example is shown in screen 1044 where the wires are detected on the C and Rc terminals but no power is detected. A red disk appears next to the terminal connected labeled “cool” which indicates a wiring error. Clicking leads to an explanation screen 1046 and a notification screen 1048, followed by a mandatory thermostat shut down (blank screen 1050). Examples of detected wiring warnings that do not block operation, and wiring errors that block operation, are discussed supra with respect to FIG. 5E.

[0094] FIGS. 10E and 10F show screens relating to certain advanced settings, according to some embodiments. Screen 1052 shows entry to the advanced settings sub-menu. Inward clicking on the sub-menu disk at screen 1052 leads to an advanced settings sub-menu selection screen 1054. Selecting “EQUIPMENT” leads to some advanced equipment related settings. For example, screens 1055, 1056 and 1057 allow the user to activate pre-heating or pre-cooling, according to what type of equipment is installed. Selecting “SAFETY TEMP.” from screen 1054 leads to screens 1059, 1060 and 1061 that allow settings for safety temperatures, which are minimum and maximum temperatures that will be maintained so long as the thermostat is operational. Safety temperatures can be useful, for example, to prevent damage such as frozen pipes, due to extreme temperatures. Selecting “HEAT PUMP” leads to screen 1062 in FIG. 10F. Note that according to some preferred embodiments, the heat pump option in screen 1054 will only appear if a heat pump is installed. Screens 1062, 1063 and 1064 allow settings for heat pump and auxiliary heating configurations. Since heat pump effectiveness decreases with decreasing outside temperature, the user is provided with an option at screen 1063 to not invoke the heat pump below a selected outside temperature. Since auxiliary resistive electric heating is very energy intensive, the user is provided with an option at screen 1064 to not invoke the auxiliary heat above a selected outside temperature. By lowering the temperature in screen 1064, the user can save auxiliary heating energy that might otherwise be used simply to speed up the heating being provided by the slower, but more energy-efficient, heat pump. For some embodiments, the real-time or near-real-time outside temperature is provided to the thermostat 300 by the cloud-based server based on the ZIP code or postal code of the dwelling. Selecting “RANGE” from screen 1054 leads to temperature range settings screens 1065, 1066, 1067 and 1068. The user is warned that enabling temperature ranges can use high levels of energy and that automatic learning has to be disabled. Screens 1070 and 1071 show examples of questions to ascertain the type of heating system installed.

[0095] FIGS. 10G, 10H and 10I show screens relating to resetting the thermostat, according to some embodiments. Screen 1072 shows entry into the reset settings sub-menu. If learning is currently active, clicking at screen 1072 leads to screen 1073. If “LEARNING” is selected, then in screens 1074, 1075 and 1076 the user can reset the learning so as to erase the current schedule and learning data. Note that screen 1075 provides a way of confirming the user's agreement with the procedure (which includes forgetting the data learned up until the present time) by asking the user to rotate the rotatable ring to that the large tick mark moves through the background tick-arc as shown. Further, the user in screen 1076 is given a time interval, in this case 10 seconds, in which to cancel the learning reset process. The reset dial and the cancellation interval effectively reduce the risk of the user inadvertently performing certain reset operations involving learned data loss. Selecting “DEFAULTS” from screen 1073 leads to screens 1077, 1078, 1079 and 1080 which erases all information from the unit and returns the thermostat unit to factory defaults. This operation could be useful, for example if the user wishes to sell the unit to someone else. If learning is not active when screen 1072 is clicked, then screen 1082 is displayed instead of screen 1073. Selecting “SCHEDULE” at screen 1082 leads to screens 1083, 1084 and 1085 which allow the user to reset the current schedule information. Selecting “RESTART” leads to screens 1086 and 1087 in which the user can re-boot the thermostat, again providing some protection against unintended data loss (in this case, the particular schedule that the user may have taken some time to establish).

[0096] FIG. 10I shows example screens following a reset operation. If the reset operation erased the information about home or business installation then screen 1088 can be displayed to obtain this setting. According to some embodiments basic questions are used to establish a basic schedule. Example questions 1090 are for a home installation, and example questions 1092 are for a business installation. Screens 1094 and 1095 show further screens in preparing a basic schedule. Screen 1096 shows the final settings screen, which is reachable by rotating the ring from screen 1072, allowing for a way for the user to exit the settings menu and return to standard thermostat operation. According to some embodiments, one or more other “exit” methods can be provided, such as clicking and holding to exit the settings menus.

[0097] FIGS. 11A-D show example screens for various error conditions, according to some embodiments. The screens shown, according to some embodiments, are displayed on a thermostat 300 on round dot-matrix electronic display 316 having a rotatable ring 312 such as shown and described in FIGS. 3A-4. In FIG. 11A, screens 1100, 1101, 1103, 1104 and 1105 show an example of a power wiring error. A red disk next to the power connector terminal label in screen 1100 shows the there is a power wire related error. Clicking leads to screen 1101 that explains the wiring error condition, including an error number associated with the error. Screen 1103 instructs the user to remove the thermostat head unit from the back-plate and to make corrective wiring connections, if possible. Screen 1104 is displayed while the thermostat is performing a test of the wiring condition following re-attachment of the head unit to the back-plate. If the error persists, screen 1105 displays information for the user to obtain technical support, as well as an error number for reference. Screens 1106, 1107, 1108 and 1109 show an example for an error where HVAC auto-detection found a problem during its initial automated testing (e.g. performed during the initial installation of the thermostat), such initial automated testing being described, for example, in U.S. Ser. No. 13/038,191, supra. In FIG. 11B, screens 1110, 1111, 1112, 1113 and 1114 show an example for an error where HVAC auto-detection found a problem during later testing. Screens 1116, 1117 and 1118 show an example where the head unit (see FIG. 4, head unit 410) had detected that the back-plate (see FIG. 4, back plate 440) has failed in some way. In FIG. 11C, thermostat screens 1120, 1121, 1122, 1123, 1124 and 1125 show an example of when the head unit detects that it has been attached to a different baseplate than it expects. The user given the option in screen 1120, to either remove the head unit from the baseplate, or reset the thermostat to its factory default settings. In FIG. 11D, screens 1130, 1131, 1132 and 1133 show an example in which power stealing (or power harvesting) is causing inadvertent tripping or switching of the HVAC function (e.g. heating or cooling). In this case the user is informed that a common wire is required to provide power to the thermostat.

[0098] FIGS. 12A and 12B show certain aspects of user interface navigation through a multi-day program schedule, according to some preferred embodiments. The screens shown, according to some embodiments, are displayed on a thermostat 300 on round dot-matrix electronic display 316 having a rotatable ring 312 such as shown and described in FIGS. 3A-4. In FIG. 12A, screen 1200 includes a rotating main menu 820 with an active window 822, as shown and described with respect to FIG. 8A. Selecting “SCHEDULE” leads to an animated transition from the rotating main menu screen to a horizontally-oriented week-long schedule viewer/editor. One example of an animated transition from the rotating main menu screen to a horizontally-oriented week-long schedule according to some embodiments is illustrated in the commonly assigned U.S. Ser. No. 29/399,636, supra. Screens 1210, 1212 and 1214 show portions of the animated transition. Screen 1210 shows a shifting or translation to the schedule display that preferably begins with a removal of the circular main menu (e.g. similar to FIG. 7A), followed by a shrinking (or zoom-out) of the circular standard thermostat view 1204. Along with the shrinking, the circular standard view 1204 begins to shift or translate to the left while the rectangular horizontally-oriented week-long schedule 1206 begins to appear from the right as shown in screen 1210. The week-long schedule begins with Monday, as shown in screen 1212, and continues to translate to a position that corresponds to the current time and day of the week, which in this example is 2:15 PM on Thursday, which is shown in screen 1214. The horizontally-oriented schedule has a plot area in which the vertical axis represents the temperature value of the setpoints and the horizontal axis represents the effective time (including the day) of the setpoints. The schedule display includes a day of the week label, labels for each 4 hours (e.g. 12A, 4A, 8A, 12P, 4P, 8P and 12P), a central horizontal cursor bar 1220 marking the current schedule time, as well as a small analog clock 1230 that displays hands indicating the current schedule time. Setpoints are indicated as circles with numbers corresponding to the setpoint temperature, and having a position corresponding to the setpoint temperature and the time that the setpoint becomes effective. According to some embodiments, the setpoint disks are filled with a color that corresponds to heating or cooling (e.g. orange or blue). Additionally, a continuation indicator mark 1222 may be included periodically, for example at each day at midnight, that show the current setpoint temperature at that point in time. The continuation indicator mark can be especially useful, for example, when there are large time gaps between setpoints such that the most recent setpoint (i.e. the active setpoint) may no longer be visible on the current display.

[0099] According to some embodiments, timewise navigation within the week-long schedule is accomplished using the rotatable ring 312 (shown in FIG. 3A). Rotating the ring clockwise shifts the schedule in one direction, such as in screen 1240, which is moves forward in time (i.e. the schedule plot area shifts to the left relative to the centrally located current schedule time cursor bar 1220, and the analog clock 1230 spins forward in displayed time). Rotating the ring counter-clockwise does the opposite, as shown in screen 1242, shifting the schedule backwards in time (i.e. the schedule plot area shifts to the right relative to the centrally located current schedule time cursor bar 1220, and the analog clock 1230 spins backward in displayed time). According to some preferred embodiments, the schedule time adjustment using the rotatable ring is acceleration-based. That is, the speed that the schedule time is adjusted is based on the speed of rotation of the ring, such that detailed adjustments in the current schedule time can be made by slowly rotating the ring, while shifts from day to day or over multiple days can be made by rapidly rotating the ring. According to some embodiments, the difference in acceleration rate factor is about 4 to 1 between the fastest and slowest rotating speeds to achieve both adequate precision and easy movement between days, or to the end of the week. Screen 1244 shows an example of more rapid movement of the rotatable ring, where the schedule has been shifted at a higher rate factor than in screen 1242. According to some embodiments the schedule time adjustments are accompanied by audible “click sound” or other noise to provide further feedback and further enhance the user interface experience. According to some preferred embodiments, the audible clicks correspond to each 15 minutes of schedule time that passes the time cursor bar 1220.

[0100] If the time cursor bar 1220 is not positioned on an existing setpoint, such as shown in screen 1214, and an inward click is received, a create new setpoint option will be offered, as in screen 1250 of FIG. 12B. In screen 1250, if the user selects “NEW” then a new setpoint disk 1254 will appear on the time cursor bar 1220, as shown in screen 1252. For some embodiments, this “birth” of the new setpoint disk 1254 proceeds by virtue of an animation similar to that illustrated in the commonly assigned U.S. Ser. No. 29/399,637, supra, wherein, as soon as the user clicks on “NEW,” a very small disk (much smaller than the disk 1254 at screen 1252) appears near the top of the cursor bar 1220, and then progressively grows into its full-size version 1254 as it visibly “slides” downward to “land” at a vertical location corresponding to a starting temperature setpoint value. For some embodiments, the starting temperature setpoint value is equal to that of an immediately preceding setpoint in the schedule. Rotating the ring will then adjust the setpoint temperature of the new setpoint disk 1254 upward or downward from that starting temperature setpoint value. According to some embodiments, an energy savings encouragement indicator, such as the leaf logo 1260, is displayed when the new setpoint temperature corresponds to energy-saving (and/or cost saving) parameters, which aids the user in making energy-saving decisions. Once the temperature for the new setpoint is satisfactory, an inward click allows adjustment of the setpoint time via the rotatable ring, as shown in screen 1256. Once the start time for the new setpoint is satisfactory, another inward click establishes the new setpoint, as shown in screen 1258. If the time cursor bar 1220 is positioned on an existing setpoint, such as shown in screen 1270, an inward click brings up a menu screen 1272 in which the user can choose to change the setpoint, remove the setpoint or return out of the schedule viewer/editor. If the user selects “CHANGE” then the user can make adjustments to the temperature and start time similar to the methods shown in screens 1252 and 1256, respectively.

[0101] According to some embodiments, setpoints must be created on even quarter-hours (i.e. on the hour, or 15, 30 or 45 minutes past), and two setpoints cannot be created or moved to be less than 60 minutes apart. Although the examples shown herein display a week-long schedule, according to other embodiments, other time periods can be used for the displayed schedule, such as daily, 3-day, two weeks, etc.

[0102] FIG. 13 shows example screens relating to the display of energy usage information, according to some embodiments. The screens shown, according to some embodiments, are displayed on a thermostat 300 on round dot-matrix electronic display 316 having a rotatable ring 312 such as shown and described in FIGS. 3A-4. From the rotating main menu such as shown in FIG. 8A, if the “ENERGY” option is selected, an interactive energy information viewer is displayed. According to some embodiments a shrinking and shifting of the standard thermostat display transition is used similar to the transition to the schedule viewer/editor described above. For example, screen 1310 (see upper right side of FIG. 13) includes a shrunken disk 1302 that corresponds to the current standard thermostat display (such as FIG. 7A), except that it is reduced in size. Rotating the ring shifts the energy viewer to display energy information for a progression of prior days, each day being represented by a different window or “disk”. For example, rotating the ring from the initial position in screen 1310 leads first to screen 1312 (showing energy information for “yesterday”), then to screen 1314 (showing energy information for the day before yesterday), then to screen 1316 (for three days prior), and then to screen 1318 (for four days prior), and so on. Preferably, the shifts between progressive disks representative of respectively progressive time periods proceeds as an animated shifting translation in a manner similar to that described for FIG. 9A (screens 900-902-908) and the commonly assigned U.S. 29/399,621, supra. According to some embodiments, the shifting information disks continue for 7 days prior, after which summary information is given for each successive prior week. Shown on each energy information disk is a measure of the amount of energy used relative to an average. For example, in disk 1332 for “yesterday” the energy usage was 4% below average, while in disk 1334 for Sunday September 11 the energy usage was up 2%. Additionally, according to some embodiments, an explanatory icon or logo is displayed where a primary reason for the change in energy usage can be determined (or estimated). For example, in screen 1322 a weather logo 1340 is displayed when the usage change is deemed primarily due to the weather, and an auto-away logo 1342 is displayed when the usage change is deemed primarily due to the auto-away detection and settings. Other logos can be used, for example, to represent changes in usage due to manual setpoint changes by users. Clicking on any of the information disk screens 1312, 1314 and 1318 lead to more detailed information screens 1322, 1324 and 1328 respectively.

[0103] FIG. 14 shows example screens for displaying an animated tick-sweep, according to some embodiments. The screens shown, according to some embodiments, are displayed on a thermostat 300 on round dot-matrix electronic display 316 having a rotatable ring 312 such as shown and described in FIGS. 3A-4. An animation is preferably displayed to enhance the user interface experience in which several highlighted background tick marks “sweep” across the space starting at the current temperature tick mark and ending at the setpoint temperature tick mark. One example of an animated tick-sweep according to some embodiments is illustrated in the commonly assigned U.S. 29/399,630, supra. In the case of cooling, shown in successive screens 1410, 1412, 1414, 1416 and 1418, highlighted background tick marks 1406 “sweep” from the current temperature tick mark 1402 to the setpoint tick mark 73. In the case of heating, the highlighted background tick marks sweep in the opposite direction.

[0104] FIGS. 15A-C show example screens relating to learning, according to some alternate embodiments. The screens shown, according to some embodiments, are displayed on a thermostat 300 on round dot-matrix electronic display 316 having a rotatable ring 312 such as shown and described in FIGS. 3A-4. In FIG. 15A, screens 1500, 1502 and 1504 display information to a user indicating in general terms how the thermostat will learn from their actions according to some embodiments. During a learning period the thermostat learns from the user's adjustments, according to some embodiments. Screens 1510 to 1512 show a user adjustment to set the setpoint to 75 degrees F. by a ring rotation input. The message “LEARNING” is flashed on and off twice to notify the user that the adjustment is being used to “train” the thermostat. After flashing, the regular message “HEATING” is displayed in screen 1516 (which could also be a time-to-temperature display if confidence is high enough). Screen 1518 is an example of a message reminding the user that the manual setpoint 75 degrees F. will only be effective until 4:15 PM, which can be due, for example, to an automatic setback imposed for training purposes (which urges the user to make another manual setpoint adjustment). In FIG. 15B, screen 1520 shows an example of a case in which the setpoint temperature has automatically been set back to a low temperature value (in this case 62 degrees) which will encourage the user can make a setpoint change according to his/her preference. Screen 1522 reminds the user that, for the learning algorithm, the user should set the temperature to a comfortable level for the current time of day, which is has been done a shown in screen 1524. According to some embodiments, during the evening hours the automatic setback to a low temperature (such as 62 degrees F.) is not carried out so as to improve comfort during the night. In screen 1530, 1532 and 1534, the temperature in the evening is automatically set to 70 degrees for user comfort. In FIG. 15C, screen 1540 shows a message informing the user that the initial learning period has completed. Screen 1542 informs the user that the auto-away confidence is suitably high and the auto-away feature is therefore enabled. Screens 1544 and 1546 inform the user that sufficient cooling and heating time calculation confidence has been achieved, respectively, for enabling sufficiently accurate time to temperature calculations, and also to notify the user that, since enough information for suitable energy-saving encouragement using the leaf logo has taken place, the leaf logo will be appearing in ways that encourage energy-saving behavior. Screen 1548 shows a message informing the user that an automatic schedule adjustment has been made due to the learning algorithm.

[0105] FIGS. 16A-16B illustrate a thermostat 1600 according to an alternative embodiment having a different form factor that, while not believed to be quite as advantageous and/or elegant as the circular form factors of one or more previously described embodiments, is nevertheless indeed within the scope of the present teachings. Thermostat 1600 comprises a body 1602 having a generally rounded-square or rounded-rectangular shape. An electronic display 1604 which is of a rectangular or rounded-rectangular shape is centrally positioned relative to the body 1602. A belt-style rotatable ring 1606 is provided around a periphery of the body 1602. As illustrated in FIGS. 16A-16B, it is not required that the belt-style rotatable ring 1606 extend around the centrally located electronic display 1604 by a full 360 degrees of subtended arc, although it is preferable that it extend for at least 180 degrees therearound so that it can be conveniently contacted by the thumb on one side and one or more fingers on the other side and slidably rotated around the centrally located electronic display 1604. The body 1602 can be mounted on a backplate (not shown) and configured to provide an inward click capability when the user's hand presses inwardly on or near the belt-style rotatable ring 1606. Illustrated on the electronic display 1604 is a population of background tick marks 1608 arcuately arranged within a range area on the electronic display 1604. Although not circular in their distribution, the background tick marks 1608 are arcuately arranged in that they subtend an arc from one angular location to another angular location relative to a center of the electronic display 1604. The particular arcuate arrangement of the background tick marks can be termed a rectangular arcuate arrangement, analogous to the way the minutewise tick marks of a rectangular or square clockface can be termed a rectangular arcuate arrangement. It is to be appreciated that the arcuate arrangement of tick marks can correspond to any of a variety of closed or semi-closed shapes without departing from the scope of the present teachings, including circular shapes, oval shapes, triangular shapes, rectangular shapes, pentagonal shapes, hexagonal shapes, and so forth. In alternative embodiments (not shown) the arrangement of background tick marks can be linear or quasi-linear, simply extending from left to right or bottom to top of the electronic display or in some other linear direction, wherein an arc is subtended between a first line extending from a reference point (such as the bottom center or center right side of the display) to the beginning of the range, and a second line extending from the reference point to the end of the tick mark range. A setpoint tick mark 1610 is displayed in a manner that is more visible to the user than the background tick marks 1608, and a numerical setpoint representation 1612 is prominently displayed in the center of the electronic display 1604.

[0106] As illustrated in FIGS. 16A-16B, the user can perform a ring rotation to change the setpoint, with FIG. 16B showing a new setpoint of 73 degrees along with a shift in the setpoint tick mark 1610 to a different arc location representative of the higher setpoint, and with a current temperature tick mark 1614 and current temperature numerical display 1616 appearing as shown. As with other embodiments, there is preferably a “sweeping” visual display of tick marks (not illustrated in FIGS. 16A-16B) that sweeps from the current temperature tick mark 1614 to the setpoint temperature tick mark 1610, analogous to the tick mark sweep shown in FIG. 14, supra. With the exception of the differently implemented ring rotation facility and the changing of various display layouts to conform to the rectangular electronic display screen 1604, operation of the thermostat 1600 is preferably similar to that of the circularly-shaped thermostat embodiments described supra. Thus, by way of non-limiting example, the thermostat 1600 is configured to provide a menu options screen (not shown) on electronic display 1604 that contains menu options such as Heat/Cool, Schedule, Energy, Settings, Away, and Done, and to function similarly to that shown in FIGS. 8A-8C responsive to rotation of the belt-style rotatable ring 1606, with the exception that instead of the electronically displayed words moving around in a circular trajectory, those words move around in a rectangular trajectory along the periphery of the electronic display 1604.

[0107] FIGS. 17A-17B illustrate a thermostat 1700 according to another alternative embodiment likewise having a different form factor that, while not believed to be quite as advantageous and/or elegant as the circular form factor, is nevertheless indeed within the scope of the present teachings. Thermostat 1700 comprises a body 1702 having a square or rectangular shape, and further comprises a rectangular electronic display 1704 that is centrally positioned relative to the body 1702. The body 1702 and electronic display 1704 are configured, such as by virtue of appropriate mechanical couplings to a common underlying support structure 1702, such that the body 1702 is manually rotatable by the user while the electronic display 1704 remains at a fixed horizontal angle, and further such that the body 1702 can be inwardly pressed by the user to achieve an inward click input, whereby the body 1702 itself forms and constitutes an inwardly pressable ring that is rotatable relative to an outwardly extending axis of rotation. With the exception of the different form factor assumed by the rotating ring/body 1702 and altered display layouts to conform to the rectangular electronic display screen 1704, operation of the thermostat 1700 is preferably similar to that of the circularly-shaped thermostat embodiments described supra. Background tick marks 1708, setpoint tick mark 1710, current temperature tick mark 1714, numerical current setpoint 1712, and numerical current setpoint 1716 appear and function similarly to their counterpart numbered elements 1608, 1610, 1614, 1612, and 1616 of FIGS. 16A-16B responsive to ring rotations and inward clicks. It is to be appreciated that the square or rectangular form factor of the body/rotatable ring 1702 and/or electronic display 1704 can be selected and/or and mixed-and-matched from among a variety of different shapes without departing from the scope of the present teachings, including circular shapes, oval shapes, triangular shapes, pentagonal shapes, hexagonal shapes, and so forth.

[0108] Although the foregoing has been described in some detail for purposes of clarity, it will be apparent that certain changes and modifications may be made without departing from the principles thereof. By way of example, it is within the scope of the present teachings for the rotatable ring of the above-described thermostat to be provided in a “virtual,” “static,” or “solid state” form instead of a mechanical form, whereby the outer periphery of the thermostat body contains a touch-sensitive material similar to that used on touchpad computing displays and smartphone displays. For such embodiments, the manipulation by the user's hand would be a “swipe” across the touch-sensitive material, rather than a literal rotation of a mechanical ring, the user's fingers sliding around the periphery but not actually causing mechanical movement. This form of user input, which could be termed a “virtual ring rotation,” “static ring rotation”, “solid state ring rotation”, or a “rotational swipe”, would otherwise have the same purpose and effect of the above-described mechanical rotations, but would obviate the need for a mechanical ring on the device. Although not believed to be as desirable as a mechanically rotatable ring insofar as there may be a lesser amount of tactile satisfaction on the part of the user, such embodiments may be advantageous for reasons such as reduced fabrication cost. By way of further example, it is within the scope of the present teachings for the inward mechanical pressability or “inward click” functionality of the rotatable ring to be provided in a “virtual” or “solid state” form instead of a mechanical form, whereby an inward pressing effort by the user's hand or fingers is detected using internal solid state sensors (for example, solid state piezoelectric transducers) coupled to the outer body of the thermostat. For such embodiments, the inward pressing by the user's hand or fingers would not cause actual inward movement of the front face of the thermostat as with the above-described embodiments, but would otherwise have the same purpose and effect as the above-described “inward clicks” of the rotatable ring. Optionally, an audible beep or clicking sound can be provided from an internal speaker or other sound transducer, to provide feedback that the user has sufficiently pressed inward on the rotatable ring or virtual/solid state rotatable ring. Although not believed to be as desirable as the previously described embodiments, whose inwardly moving rotatable ring and sheet-metal style rebounding mechanical “click” has been found to be particularly satisfying to users, such embodiments may be advantageous for reasons including reduced fabrication cost. It is likewise within the scope of the present teachings for the described thermostat to provide both the ring rotations and inward clicks in “virtual” or “solid state” form, whereby the overall device could be provided in fully solid state form with no moving parts at all.

[0109] By way of further example, although described above as having ring rotations and inward clicks as the exclusive user input modalities, which has been found particularly advantageous in terms of device elegance and simplicity, it is nevertheless within the scope of the present teachings to alternatively provide the described thermostat with an additional button, such as a “back” button. In one option, the “back” button could be provided on the side of the device, such as described in the commonly assigned U.S. Ser. No. 13/033,573, supra. In other embodiments, plural additional buttons, such as a “menu” button and so forth, could be provided on the side of the device. For one embodiment, the actuation of the additional buttons would be fully optional on the part of the user, that is, the device could still be fully controlled using only the ring rotations and inward clicks. However, for users that really want to use the “menu” and “back” buttons because of the habits they may have formed with other computing devices such as smartphones and the like, the device would accommodate and respond accordingly to such “menu” and “back” button inputs.

[0110] By way of even further example, other forms of user input modalities could be provided by the above-described thermostat as additions and/or alternative to the above-described ring rotations and inward clicks without necessarily departing from the scope of the present teachings. Examples include optically sensed gesture-based user inputs similar to those provided with modern video game consoles, and voice inputs implemented using known speech recognition algorithms. It is to be appreciated that there are many alternative ways of implementing both the processes and apparatuses described herein. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the inventive body of work is not to be limited to the details given herein, which may be modified within the scope and equivalents of the appended claims.