WO2014066272A1

WO2014066272A1 - Battery-powered retrofit remote control device

Info

Publication number: WO2014066272A1
Application number: PCT/US2013/065983
Authority: WO
Inventors: Matthew J. SWATSKY; Chris DIMBERG; Timothy S. Majewski; Robert C. Newman, Jr.; Daniel Curtis Raneri
Original assignee: Lutron Electronics Co., Inc.
Priority date: 2012-10-26
Filing date: 2013-10-21
Publication date: 2014-05-01
Also published as: WO2014066269A1

Abstract

A remote control device may be configured to be mounted over the toggle actuator of a light switch and to control a load control device via wireless communication. The remote control device may include a base portion and a rotating portion supported by the base portion so as to be rotatable about the base portion. The remote control device may include a control circuit and a wireless communication circuit. The control circuit may be operably coupled to the rotating portion and to the wireless communication circuit. The control circuit may be configured to translate a force applied to the rotating portion of the remote control device into a control signal and to cause the communication circuit to transmit the control signal to the load control device.

Description

BATTERY-POWERED RETROFIT REMOTE CONTROL DEVICE

CROSS REFERENCE TO RELATED APPLICATOINS

[0001] This application claims priority from provisional U.S. Patent Application No.

61/718,818, filed October 26, 2012, entitled WIRELESS LOAD CONTROL SYSTEM HAVING CONTROLLABLE LIGHT SOURCES AND ROTARY REMOTE CONTROL DEVICES, U.S. Patent Application No. 13/829,981 filed March 14, 2013, entitled BATTERY-POWERED

RETROFIT REMOTE CONTROL DEVICE, and U.S. Patent Application No. 13/829,834 filed March 14, 2013, entitled CONTROLLABLE LIGHT SOURCE.

BACKGROUND

[0002] In prior art load control systems, standard mechanical toggle switches are often replaced by more advanced load control devices (such as dimmer switches) that control the amount of power delivered from an AC power source to an electrical load. This procedure requires that the old mechanical toggle switch be un-wired and removed from the load control system and the new load control device to be connected to the electrical wiring. Typically, such a procedure must be performed by an electrical contractor or other skilled installer. The average consumer may not feel comfortable to complete the installation of the load control device. Accordingly, there is a need for a load control system that may be installed in an existing installation having a mechanical toggle switch without requiring any electrical work.

SUMMARY

[0003] As described herein, a remote control device may provide a simple retrofit solution for an existing switched control system. Implementation of the remote control device, for example in an existing switched control system, may enable energy savings and/or advanced control features, for example without requiring any electrical re-wiring and/or without requiring the replacement of any existing mechanical switches.

[0004] The remote control device may be configured to control an electrical load, such as a lighting load. The remote control device may be configured to be mounted over the toggle actuator of an existing mechanical switch that controls whether power is delivered to the electrical load.

[0005] The remote control device may be configured to maintain the toggle actuator in an on position when mounted over the toggle actuator, such that a user of the remote control device is not able to mistakenly switch the toggle actuator to the off position, which may cause the electrical load to be unpowered such that the electrical load cannot be controlled by one or more remote control devices. The remote control device may be configured to control multiple types of electrical loads on a single electrical circuit (e.g., substantially in unison). A load control system may include multiple remote control devices that are configured to provide individual (e.g. , zoned) control of each of a plurality of electrical loads coupled to a single electrical circuit.

[0006] The remote control device may be configured to control a load control device of a load control system without requiring access to the electrical wiring of the load control system. An electrical load may be electrically connected to the load control device such that the load control device may control an amount of power delivered to the electrical load. The electrical load may include a toggle actuator configured to switch electrical power to the electrical load on and/or off.

[0007] The remote control device may be configured to be attached to the toggle actuator.

For example, the remote control device may be configured to mount over a portion of the toggle actuator. The remote control device may include a base portion and an intensity adjustment actuator operatively attached to the base portion and configured to move relative to the base portion. The intensity adjustment actuator may be a rotating portion supported by the base portion and rotatable about the base portion. The intensity adjustment actuator may be a slider supported by the base portion and configured to slide relative to the base portion. The remote control device may be configured such that the base portion does not actuate the actuator of the electrical load when a force is applied to the rotating portion. [0008] The remote control device may include a control circuit and a wireless

communication circuit. The control circuit may be operatively connected to the intensity adjustment actuator of the remote control device. The control circuit may be communicatively connected to the intensity adjustment actuator of the remote control device and to the wireless communication circuit.

[0009] The control circuit may be configured to translate a force applied to the intensity adjustment actuator of the remote control device into a control signal for the load control device. The control circuit may, responsive to the application of a force to the intensity adjustment actuator of the remote control device, generate one or more control signals and may cause the communication circuit to transmit the one or more control signals, for example to the load control device.

[0010] A load control system may include a mechanical switch coupled in series electrical connection between an alternating current (AC) power source and a socket. The load control system may be retrofitted for wireless control. Retrofitting the load control system for wireless control may include installing a controllable light source in the socket. Retrofitting the load control system for wireless control may include mounting a remote control device over a toggle actuator of the mechanical switch. Retrofitting the load control system for wireless control may include associating the controllable light source and the remote control device with each other, such that the controllable light source is responsive to a signal transmitted to the controllable light source by the remote control device via wireless communication. The toggle switch may be operated to an on position prior to mounting the remote control device over the toggle actuator, for example such that the controllable light source is electrically coupled to the AC power source. Associating the controllable light source and the remote control device with each other may include actuating respective actuators of the controllable light source and the remote control device.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG. 1 depicts an example load control system.

[0012] FIG. 2 is a simplified block diagram of an example controllable light source. [0013] FIG. 3 is a perspective view of an example rotary remote control device attached to a switch.

[0014] FIG. 4 is a perspective view of the rotary remote control device depicted in FIG. 3, detached from the switch.

[0015] FIG. 5 is a perspective view of the base portion of an example rotary remote control device.

[0016] FIG. 6 is a simplified block diagram of an example rotary remote control device.

[0017] FIG. 7 A depicts a first encoder control signal and a second encoder control signal when an example rotary remote control device is actuated along a first direction.

[0018] FIG. 7B depicts a first encoder control signal and a second encoder control signal when an example rotary remote control device is actuated along a second direction.

[0019] FIG. 8 depicts another example load control system.

DETAILED DESCRIPTION

[0020] FIG. 1 depicts an example load control system 100. As shown, the load control system 100 is configured as a lighting control system that includes a controllable light source 110 and a battery-powered remote control device 120, for example a rotary remote control device. The remote control device 120 includes a wireless transmitter. The load control system 100 includes a standard, single pole single throw (SPST) maintained mechanical switch 104 (i.e., a "toggle switch" or a "light switch") that may be in place prior to installation of the remote control device 120 (e.g., pre-existing in the load control system 100). The switch 104 is coupled in series electrical connection between an alternating current (AC) power source 102 and the controllable light source 110. The switch 104 includes a toggle actuator 106 that may be actuated to toggle, for example to turn on and/or turn off, the controllable light source 110. The controllable light source 110 is electrically coupled to the AC power source 102 when the switch 104 is closed (i.e., conductive), and is disconnected from the AC power source 102 when the switch 104 is open (i.e., nonconductive).

[0021] The remote control device 120 is configured to be attached to the toggle actuator 106 of the switch 104 when the toggle actuator 106 is in the on position (which is typically pointing upwards) and the switch 104 is closed (i.e., conductive). As shown, the remote control device 120 includes a base portion 125 configured to be mounted over the toggle actuator 106 of the switch 104. The base portion 125 may operate to maintain the toggle actuator 106 stays in the on position, such that a user is not able to switch the toggle actuator 106 to the off position, which may disconnect the controllable light source 110 from the AC power source 102.

[0022] The remote control device 120 may be operable to transmit wireless signals, for example radio frequency (RF) signals 108, to the controllable light source 110 for controlling the intensity of the controllable light source 110. The controllable light source 110 may be associated with the remote control device 120 during a configuration procedure of the load control system 100, such that the controllable light source 110 is then responsive to the RF signals 108 transmitted by the remote control device 120. An example of a configuration procedure for associating a remote control device with a load control device is described in greater detail in commonly-assigned U.S. Patent Publication No. 2008/0111491, published May 15, 2008, entitled "Radio-Frequency Lighting Control System," the entire disclosure of which is hereby incorporated by reference.

[0023] The controllable light source 110 may include a lighting load, for example the lighting load 214 shown in FIG. 2, such as an incandescent lamp, a halogen lamp, a compact fluorescent lamp, a light-emitting diode (LED) light engine, or other suitable light source. The controllable light source 110 includes a housing 111 that defines an end portion 114 and an intermediate portion 112. The housing 111 may be made of any suitable material, for example glass. The lighting load may be integral with and/or substantially enclosed by the housing 111. For example, the lighting load may be located inside of the intermediate portion 112 of the housing 111.

[0024] The controllable light source 110 may be configured such that light emitted from the lighting load shines through at least a portion of the housing 111. As shown, the intermediate portion 1 12 is configured to be reflective, such that the intermediate portion 1 12 functions as a reflector portion of the housing 1 1 1. The intermediate portion 1 12 may include one or more reflective surfaces. The end portion 1 14 is configured as a light emitting portion configured to shine light emitted by the lighting load out of the housing 1 1 1. The end portion 1 14 may be transparent or translucent. The end portion 1 14 of the housing 1 1 1 may define an end surface 1 13. The housing 1 1 1 may define any suitable shape, for example the illustrated bulb shape. As shown, the end portion 1 14 defines a convex, domed shape, but may be configured to define any other suitable shape, for example flat. The housing 1 1 1 is not limited to the illustrated configuration of shining light emitted by the lighting load. For example, the housing 1 1 1 may be configured to shine light emitted from the lighting load through the intermediate portion 1 12 (e.g., at least a part of the intermediate portion 1 12) and/or the end portion 1 14 (e.g., at least a part of the end portion 1 14).

[0025] As shown, the controllable light source 1 10 includes an enclosure 1 15 that is configured to house one or more electrical components of the controllable light source 1 10, such as an integral load control circuit (e.g., the load control circuit 212 shown in FIG. 2), for controlling the intensity of the lighting load between a low end intensity (e.g., approximately 1%) and a high-end intensity (e.g., approximately 100%). The controllable light source 1 10 may include a wireless communication circuit (e.g., wireless communication circuit 222 shown in FIG. 2) housed inside the enclosure 1 15, such that the controllable light source 1 10 may be operable to receive the RF signals 108 transmitted by the remote control device 120 and control the intensity of the lighting load in response to the received RF signals. As shown, the enclosure 1 15 is attached to the intermediate portion 1 12 of the housing 1 1 1 and may function as an enclosure portion of the housing 1 1 1.

Alternatively, the enclosure 1 15 may be integral with, for example monolithic with, the housing 1 1 1 , such that the enclosure 1 15 defines an enclosure portion of the housing 1 1 1.

[0026] The controllable light source 1 10 may be configured as a screw-in, controllable light source. As shown, the controllable light source 1 10 includes a screw-in base 1 16 that is configured to be screwed into a standard Edison socket, such that the controllable light source may be coupled to the AC power source 102. The screw-in base 1 16 may be attached to the enclosure 1 15. The controllable light source 1 10 may be configured as a downlight (e.g., as shown in FIG. 1) that may be installed in a recessed light fixture. Alternatively, the controllable light source 1 10 may be configured as an A type lamp or any other type of screw-in lamp, for example. The controllable light source 1 10 is not limited to the illustrated screw-in base 1 16, and may include any suitable base, for example a bayonet-style base or other suitable base providing electrical connections. Examples of screw-in luminaires are described in greater detail in commonly assigned U.S. Patent No. 8,008,866, issued August 30, 201 1 , entitled "Hybrid Light Source," and U.S. Patent Application Publication No. 2012/0286689, published November 15, 2012, entitled "Dimmable Screw-In Compact Fluorescent Lamp Having Integral Electronic Ballast Circuit," the entire disclosures of which are hereby incorporated by reference.

[0027] The controllable light source 1 10 may further comprise a transparent (e.g., translucent) actuator 1 18, such as a clear button, that may be pressed to associate the controllable light source with the remote control device 120. The actuator 1 18 may protrude from the end portion 1 14 of the housing 1 1 1 , for example below the end surface 1 13, such that the actuator 1 18 may be pressed when the controllable light source 1 10 is installed, for example in a recessed downlight fixture. Alternatively, the actuator 1 18 may be flush with the end surface 1 13 of the end portion 1 14 or may be recessed in the end surface 1 13 of the end portion 1 14 (e.g., such that the actuator 1 18 may be actuated by a tool, such as a screwdriver). When the controllable light source 1 10 is installed in a recessed downlight fixture, the intermediate portion 1 12 (e.g., the reflector portion) of the housing 1 1 1 and the enclosure 1 15 may be substantially enclosed within the downlight fixture, and at least a portion of the end portion 1 14, for example the end surface 1 13, may not be enclosed by the downlight fixture, such that actuator 1 18 may be actuated. The actuator 1 18 may alternatively be positioned along a perimeter of the end portion 1 14. Alternatively, the controllable light source 1 10 may include an actuator supported by the enclosure 1 15 that may be actuated when the end portion 1 14, for example the end surface 1 13, is pressed towards the screw-in base 1 16. The end surface 1 13, and/or another surface of the controllable light source 1 10, may alternatively include a touch sensitive surface, for example a resistive, capacitive, or other touch sensitive surface that may be touched to associate the controllable light source 1 10 with the remote control device 120. [0028] The actuator 1 18 may be configured to be rotated to adjust a selectable maximum power rating of the controllable light source 1 10, such that the controllable light source 1 10 operates the lighting load at the maximum power rating when the remote control device 120 controls the intensity of the controllable light source to the high-end intensity. The remote control device 120 may then be operable to control the controllable light source 1 10 to dim the intensity of the lighting load below the high-end intensity down to the low-end intensity.

[0029] The load control system 100 may also include one or more other devices configured to wirelessly communicate with the controllable light source 1 10. As shown, the load control system 100 includes a handheld, battery-powered, remote control device 130 for controlling the controllable light source 1 10. The remote control device 130 may include one or more buttons, for example, an on button 132, an off button 134, a raise button 135, a lower button 136, and a preset button 138, as shown in FIG. 1. The remote control device 130 may include a wireless communication circuit (not shown) for transmitting digital messages (e.g., including commands to control the lighting load) to the controllable light source 1 10, for example via the RF signals 108, responsive to actuations of one or more of the buttons 132, 134, 135, 136, and 138. Alternatively, the remote control device 130 may be mounted to a wall or supported by a pedestal, for example a pedestal configured to be mounted on a tabletop. Examples of handheld battery-powered remote controls are described in greater detail in commonly assigned U.S. Patent No. 8,330,638, issued December 1 1 , 2012, entitled "Wireless Battery Powered Remote Control Having Multiple Mounting Means," and U.S. Patent No. 7,573,208, issued August 22, 1009, entitled "Method Of Programming A Lighting Preset From A Radio -Frequency Remote Control," the entire disclosures of which are hereby incorporated by reference.

[0030] The load control system 100 may also include one or more of a remote occupancy sensor or a remote vacancy sensor (not shown) for detecting occupancy and/or vacancy conditions in a space surrounding the sensors. The occupancy or vacancy sensors may be configured to transmit digital messages to the controllable light source 1 10, for example via the RF signals 108, in response to detecting occupancy or vacancy conditions. Examples of RF load control systems having occupancy and vacancy sensors are described in greater detail in commonly-assigned U.S. Patent No. 7,940,167, issued May 10, 201 1 , entitled "Battery Powered Occupancy Sensor," U.S. Patent No. 8,009,042, issued August 30, 201 1 , entitled "Radio Frequency Lighting Control System With Occupancy Sensing," and U.S. Patent Application No. 8, 199,010, issued June 12, 2012, entitled "Method And Apparatus For Configuring A Wireless Sensor," the entire disclosures of which are hereby incorporated by reference.

[0031] The load control system 100 may include a remote daylight sensor (not shown) for measuring a total light intensity in the space around the daylight sensor. The daylight sensor may be configured to transmit digital messages, such as a measured light intensity, to the controllable light source 1 10, for example via the RF signals 108, such that the controllable light source 1 10 is operable to control the intensity of the lighting load in response to the measured light intensity. Examples of RF load control systems having daylight sensors are described in greater detail in commonly assigned U.S. Patent Application No. 12/727,956, filed March 19, 2010, entitled

"Wireless Battery-Powered Daylight Sensor," and U.S. Patent Application No. 12/727,923, filed March 19, 2010, entitled "Method Of Calibrating A Daylight Sensor," the entire disclosures of which are hereby incorporated by reference.

[0032] The load control system 100 may include other types of input devices, for example, radiometers, cloudy-day sensors, temperature sensors, humidity sensors, pressure sensors, smoke detectors, carbon monoxide detectors, air-quality sensors, security sensors, proximity sensors, fixture sensors, partition sensors, keypads, kinetic or solar-powered remote controls, key fobs, cell phones, smart phones, tablets, personal digital assistants, personal computers, laptops, time clocks, audiovisual controls, safety devices, power monitoring devices (such as power meters, energy meters, utility submeters, utility rate meters), central control transmitters, residential, commercial, or industrial controllers, or any combination of these input devices.

[0033] During the configuration procedure of the load control system 100, the controllable light source 1 10 may be associated with a wireless control device, for example the remote control device 120, by actuating the actuator 1 18 on the controllable light source 1 10 and then actuating (e.g., pressing and holding) an actuator on the wireless remote control device (e.g., a rotating portion 322 of a rotary remote control device 320 shown in FIG. 3) for a predetermined amount of time (e.g., approximately 10 seconds).

[0034] Digital messages transmitted by the remote control device 120, for example directed to the controllable light source 110, may include a command and identifying information, such as a unique identifier (e.g., a serial number) associated with the remote control device 120. After being associated with the remote control device 120, the controllable light source 110 may be responsive to messages containing the unique identifier of the remote control device 120. The controllable light source 110 may be associated with one or more other wireless control devices of the load control system 100 (i.e., the remote control device 130, the occupancy sensor, the vacancy sensor, and/or the daylight sensor), for example using similar association process.

[0035] After a remote control device, for example the remote control device 120 or the remote control device 130, is associated with the controllable light source 110, the remote control device may be used to associate the controllable light source 110 with the occupancy sensor, the vacancy sensor, and/or the daylight sensor, without actuating the actuator 118 of the controllable light source 110, for example as described in greater detail in commonly-assigned U.S. Patent Application No. 13/598,529, filed August 29, 2012, entitled "Two Part Load Control System

Mountable To A Single Electrical Wallbox," the entire disclosure of which is hereby incorporated by reference.

[0036] When the remote control device 120 is mounted over the toggle actuator of a switch

(e.g., the toggle actuator 106), the base portion 125 may function to secure the toggle actuator 106 from being toggled. For example, the base portion 125 may be configured to maintain the toggle actuator 106 in an on position, such that a user of the remote control device 120 is not able to mistakenly switch the toggle actuator 106 to the off position, which may disconnect the controllable light source 110 from the AC power source 102, such that controllable light source 110 may not be controlled by one or more remote control devices of the load control system 100 (e.g., the remote control devices 120 and/or 130), which may in turn cause user confusion. [0037] As shown, the remote control device 120 is battery-powered, not wired in series electrical connection between the AC power source 102 and the controllable light source 110 (e.g., does not replace the mechanical switch 104), such that the controllable light source 110 receives a full AC voltage waveform from the AC power source 102 (i.e., the controllable light source 110 does not receive a phase-control voltage that may be created by a standard dimmer switch). Because the controllable light source 110 receives the full AC voltage waveform, multiple controllable light sources (e.g., controllable light sources 110) may be coupled in parallel on a single electrical circuit (e.g., coupled to the mechanical switch 104). The multiple controllable light sources may include light sources of different types (e.g., incandescent lamps, fluorescent lamps, and/or LED light sources). The remote control device 120 may be configured to control one or more of the multiple controllable light sources, for example substantially in unison. In addition, if there are multiple controllable light sources coupled in parallel on a single circuit, each controllable light source may be zoned, for example to provide individual control of each controllable light source. For example, a first controllable light 110 source may be controlled by the remote control device 120, while a second controllable light source 110 may be controlled by the remote control device 130). In prior art systems, a mechanical switch (such as the switch 104, for example) typically controls such multiple light sources in unison (e.g., turns them on and/or off together).

[0038] The controllable light source 110 and the remote control device 120 may be part of a larger RF load control system than that shown in FIG. 1. Examples of RF load control systems are described in commonly-assigned U.S. Patent No. 5,905,442, issued on May 18, 1999, entitled "Method And Apparatus For Controlling And Determining The Status Of Electrical Devices From Remote Locations," and U.S. Patent Application No. 12/033,223, filed February 19, 2008, entitled "Communication Protocol For A Radio Frequency Load Control System," the entire disclosures of which are both hereby incorporated by reference.

[0039] While the load control system 100 was described with reference to the single-pole system shown in FIG. 1, one or both of the controllable light source 110 and the remote control device 120 may be implemented in a "three-way" lighting system having two single-pole double- throw (SPDT) mechanical switches (i.e., a "three-way" switch) for controlling a single electrical load. For example, the system could comprise two remote control devices 120, with one remote control device 120 connected to the toggle actuator of each SPDT switch. The toggle actuators of each SPDT switch would be positioned, such that the SPDT switches form a complete circuit between the AC source and the electrical load before the remote control devices 120 are installed on the toggle actuators.

[0040] The load control system 100 shown in FIG. 1 may provide a simple retrofit solution for an existing switched control system. The load control system 100 may provide energy savings and/or advanced control features, for example without requiring any electrical re -wiring and/or without requiring the replacement of any existing mechanical switches. To install and use the load control system 100 of FIG. 1 , a consumer may replace an existing lamp with the controllable light source 1 10, switch the toggle actuator 106 of the mechanical switch 104 to the on position, install (e.g., mount) the remote control device 120 onto the toggle actuator 106, and associate the remote control device 120 and the controllable light source 1 10 with each other, for example as described above.

[0041] FIG. 2 is a simplified block diagram of an example controllable light source 210 that may be deployed as, for example, the controllable light source 1 10 of the load control system 100 shown in FIG. 1. As shown, the controllable light source 210 includes a hot terminal H and a neutral terminal N that are configured to be electrically coupled to an AC power source, such as the AC power source 102, for example via the screw-in base 1 16.

[0042] The controllable light source 210 includes a lighting load 214 and a load control circuit 212 for controlling the intensity of the lighting load 214. The controllable light source 210 includes an electromagnetic interference (EMI) filter 216 that may operate to mitigate (e.g., prevent) noise generated by the load control circuit 212 from being conducted on the AC mains wiring. The controllable light source 210 may include a rectifier circuit 218 for generating a direct-current (DC) bus voltage V_Bus across a bus capacitor C_Bus- As shown, the load control circuit 212 receives the bus voltage VBUS and regulates the power delivered to the lighting load 214 in order to control the intensity of the lighting load 214. For example, the load control circuit 212 for controlling the lighting load 214 may include a dimmer circuit for an incandescent lamp, an electronic ballast circuit for a compact fluorescent lamp (CFL), a light-emitting diode (LED) driver for an LED light engine, or the like.

[0043] The controllable light source 210 includes a control circuit 220 operatively coupled to the load control circuit 212. The control circuit 220 may operate to control the intensity of the lighting load 214. The control circuit 220 may include one or more of a processor (e.g., a microprocessor), a microcontroller, a programmable logic device (PLD), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or any suitable processing device.

[0044] The controllable light source 210 includes a wireless communication circuit 222, for example an RF receiver coupled to an antenna for receiving the RF signals 108 from wireless remote control devices, such as the remote control device 120, the remote control device 130, the occupancy sensor, and the daylight sensor of the load control system 100 shown in FIG. 1. Alternatively, the wireless communication circuit 222 may include an RF transmitter for transmitting RF signals, an RF transceiver for transmitting and receiving RF signals, or an infrared (IR) receiver for receiving IR signals.

[0045] The controllable light source 210 includes a memory 224 communicatively coupled to the control circuit 220. The control circuit 220 may be configured to use the memory 224 for the storage and/or retrieval of, for example, unique identifiers (e.g., serial numbers) of the wireless remote control devices to which the controllable light source 210 is responsive. The memory 224 may be implemented as an external integrated circuit (IC) or as an internal circuit of the control circuit 220.

[0046] The controllable light source 210 includes an actuator 226 that is operatively coupled to the control circuit 220. The actuator 226 may be actuated to associate the controllable light source 210 with one or more of the wireless remote control devices. For example, the actuator 226 may be mechanically coupled to the actuator 1 18 shown in FIG. 1.

[0047] The controllable light source 210 includes a power supply 228 coupled to the bus voltage VBUS for generating a DC supply voltage Vcc- The supply voltage Vcc may be used to power one or more of the control circuit 220, the wireless communication circuit 222, the memory 224, and other low- voltage circuitry of the controllable light source 210.

[0048] The controllable light source 210 may include an integral occupancy sensing circuit

(not shown) configured to detect occupancy and/or vacancy conditions in a space surrounding the controllable light source 210, for example in a similar manner as the remote occupancy sensor described above with reference to FIG. 1. The control circuit 220 may be configured to control the lighting load 214 in response to occupancy and vacancy conditions detected by the occupancy sensing circuit.

[0049] The controllable light source 210 may include an integral daylight (or ambient light) sensing circuit (not shown) configured to measure a light intensity (e.g. , a total light intensity) in a space around the controllable light source 210, for example in a similar manner as the remote daylight sensor described above with reference to FIG. 1. The control circuit 220 may be configured to control the lighting load 214 in response to light intensity measured by the daylight sensing circuit.

[0050] The controllable light source 210 may include an integral power measurement circuit

(not shown) configured to measure a total amount of power consumed by the lighting load 214 and/or the controllable light source 210. The control circuit 220 may be configured to control the lighting load 214 in response to power consumption measured by the power measurement circuit and/or to cause the wireless communication circuit 222 to transmit one or more RF signals that may include information pertaining to a measured power consumption. A load control device capable of power measurement is described in greater detail in commonly-assigned U.S. Patent Application No. 13/793,308, filed March 1 1 , 2013, entitled "Power Measurement in a Two-Wire Load Control Device," the entire disclosure of which is hereby incorporated by reference.

[0051] FIGs. 3 and 4 are perspective views of an example rotary remote control device 320 that may deployed as, for example, the remote control device 120 of the load control system 100 shown in FIG. 1. As shown, the rotary remote control device 320 is configured to be mounted over the toggle actuator of a mechanical switch, for example the toggle actuator 106 of the switch 104 as shown in FIG. 1, over which a standard, traditional-style faceplate 329 is installed.

[0052] As shown, the rotary remote control device 320 includes an intensity adjustment actuator, configured as a rotating portion 322 that may be moved for example rotated, with respect to a base portion 325. One or more components of the rotary remote control device 320, for example the rotating portion 322 and the base portion 325, may be made of any suitable material, such as plastic. The rotating portion 322 may be supported by the base portion 325 so as to be rotatable in opposed directions about the base portion 325, for example in the clockwise or counter-clockwise directions.

[0053] The illustrated rotating portion 322 includes a body that defines a disc-shaped front portion 321 and an annular side portion 324 that extends around an entirety of an outer perimeter of the front portion 321. The front portion 321 defines a front surface 323. The front portion 321 of the rotating portion 322 may be made of a translucent material, so as to allow a night light that may be located in a toggle actuator to which the rotary remote control device 320 is attached to shine through the front portion 321. Alternatively, the rotary remote control device 320 may include an internal night light circuit, for example, as described in greater detail in commonly-assigned U.S. Patent Application Publication No. 2012/0286940, published November 15, 2012, entitled "Control Device Having a Night Light," the entire disclosure of which is hereby incorporated by reference. The rotary remote control device 320 may be configured to be mounted on a mechanical switch having a designer-style faceplate or other faceplate style.

[0054] The base portion 325 may be configured to be attached to the faceplate 329. For example, the base portion may define a rear surface 327 configured to be attached to the faceplate 329. With the rotating portion 322 rotatably attached to the base portion 325, the rear surface 327 of the base portion 325 may protrude inwardly beyond a lower edge of the side portion 324. The base portion 325 defines an opening 326 that extends into the rear surface 327. The opening 326 is dimensioned to receive at least a portion of the toggle actuator of a switch, for example the toggle actuator 106 of the switch 104 as shown in FIG. 1. [0055] The base portion 325 may be configured to be fixedly (e.g., permanently) attached to the toggle actuator or may be configured to be removably attached to the toggle actuator, so to allow access to the toggle actuator in order to disconnect power from an electrical load controlled by the mechanical switch, for example the controllable light source 1 10 of the load control system 100 shown in FIG. 1. As shown, the base portion 325 defines a plurality of crush ribs 328 that extend into the opening 326, the crush ribs 328 configured to engage one or more surfaces of a toggle actuator over which the rotary remote control device 320 is mounted. The base portion 325 may be alternatively configured to attach to the toggle actuator of a switch. For example, the base portion 325 may be configured to attach to the toggle actuator via one or more mechanical fasteners, for example, a set screw, a camming clamp, or the like.

[0056] The rotary remote control device 320 may be configured to transmit wireless signals, for example RF signals, to a load control device, for example the controllable light source 1 10 shown in FIG. 1 or the controllable light source 210 shown in FIG. 2, for controlling the intensity of a respective lighting load, for example the lighting load 214. The rotary remote control device 320 may transmit one or more wireless signals, for example, responsive to actuations of the rotating portion 322, such as a rotational force applied to the side portion 324 of the rotating portion 322 along the clockwise or counter-clockwise directions. A controllable light source associated with the rotary remote control device 320, for example the controllable light source 1 10, may adjust the intensity of the lighting load in response to rotation of the rotating portion 322. The controllable light source may turn the lighting load on and off responsive to forces applied to (e.g. , presses of) the front surface 323 of the front portion 321 that cause front portion 321 to be biased toward the base portion 325. A speed at which the controllable light source adjusts the intensity of the lighting load in response to the rotation of the rotating portion 322 may be a function of the rotational speed at which the rotating portion 322 is rotated. An example of a load control device responsive to a rotary actuator is described in greater detail in commonly-assigned U.S. Patent No. 8,212,486, issued July 3, 2012, entitled "Smart Load Control Device Having A Rotary Actuator," the entire disclosure of which is hereby incorporated by reference. [0057] The rotary remote control device 320 may be configured to cause the controllable light source to "jog" the intensity of the lighting load, for example to increase or decrease intensity of the lighting load, by a predetermined amount in response to a slight rotation of the rotating portion 322 in either direction, for example a rotation of approximately 45°. The rotary remote control device 320 may be configured to cause the controllable light source to continuously adjust the intensity of the lighting load in response to the rate and/or degree of rotation of the rotating portion 322 in either direction, for example rotations greater rotation than 45°. The rotating portion 322 may be configured to return to an idle position after the rotation of the rotating portion 322. The front surface 323 of the front portion 321 of the rotating portion 322 could be marked with text and/or an image that remains upright when the rotating portion 322 is in the idle position. Alternatively, the rotary remote control device 320 may be configured such that the side portion 324 is rotatable and the front portion 321 is fixed relative to the base portion 325, such that text and/or images on the front surface 323 of the front portion 321 remain upright.

[0058] The base portion 325 may be configured to be attached (e.g., removably attached) to the faceplate 329, for example, using double sided tape affixed to the rear surface 327.

Alternatively, the base portion 325 may define one or more snap fit catches (not shown) that extend inward from the base portion 325 relative to the rear surface 327 and are configured to engage within the actuator opening of a faceplate. Alternatively still, the base portion 325 may define on more apertures that extend into the rear surface 327 and a complementary faceplate (not shown) may define one or more snap fit catches configured to be received in, and engage within, the apertures in the base portion 325. Alternatively still, the base portion 325 may be configured to be magnetically attached to the faceplate.

[0059] Alternatively, the base portion 325 of the rotary remote control device 320 may be integral with a corresponding faceplate, for example the base portion 325 and the faceplate may be monolithic. Such a rotary remote control device 320 may be mounted over the toggle actuator of a switch by first removing a traditional style faceplate from the switch and replacing the traditional faceplate with the faceplate having an integrated rotary remote control device 320. Such a rotary remote control device 320 may include a solar cell affixed to the integral faceplate, the solar cell configured to charge a battery of the rotary remote control device 320 and/or to power a controller and/or an RF transmitter of the rotary remote control device 320.

[0060] FIG. 5 is a perspective view of the base portion 425 of an example rotary remote control device. The base portion 425 may be deployed as, for example, the base portion 325 of the rotary remote control device 320 shown in FIGs. 3 and 4. The base portion 425 defines an opening 426 that is dimensioned to receive at least a portion of the toggle actuator 406 of a switch, for example the switch 104 as shown in FIG. 1. The base portion 425 includes a friction spring 440 configured to attach the base portion 425 to a toggle actuator 406, for example the toggle actuator 106 of the switch 104 shown in FIG. 1. The illustrated friction spring 440 includes a plurality of fingers 442 configured to capture at least a portion of the toggle actuator 406. As shown, the fingers 442 of the friction spring 440 flank opposed sides of the opening 426.

[0061] FIG. 6 is a simplified block diagram of an example rotary remote control device 520 that may be implemented as, for example, the remote control device 120 shown in FIG. 1 and/or the rotary remote control device 320 shown in FIGs. 3 and 4. As shown, the rotary remote control device 520 includes a control circuit 530. The control circuit 530 may include one or more of a processor (e.g., a microprocessor), a microcontroller, a programmable logic device (PLD), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or any suitable processing device.

[0062] The rotary remote control device 520 includes a rotary encoder circuit 532 that may be operatively coupled to a rotary knob, for example the rotating portion 322 of the rotary remote control device 320. The control circuit 530 is communicatively coupled to the rotary encoder circuit 532. The rotary remote control device 520 includes a wireless communication circuit 534, for example an RF transmitter coupled to an antenna, for transmitting wireless signals, such as the RF signals 108, in response to actuations of the rotary knob coupled to the rotary encoder circuit 532 (e.g., the rotating portion 322 of the rotary remote control device 320). The control circuit 530 may cause the wireless communication circuit 534 to transmit one or more wireless signals to an associated load control device, for example the controllable light source 1 10 shown in FIG. 1 or the controllable light source 210 shown in FIG. 2, for example responsive to actuations of the rotary knob coupled to the rotary encoder circuit 532. Alternatively, the wireless communication circuit 534 may include an RF receiver for receiving RF signals, an RF transceiver for transmitting and receiving RF signals, or an infrared (IR) receiver for receiving IR signals.

[0063] The rotary remote control device 520 includes a memory 536 communicatively coupled to the control circuit 530. The control circuit 530 may be configured to use the memory 536 for the storage and/or retrieval of, for example, a unique identifier (e.g., a serial number) of the rotary remote control device 520 that may be included in the transmitted RF signals. The memory 536 may be implemented as an external integrated circuit (IC) or as an internal circuit of the control circuit 530.

[0064] The rotary remote control device 520 includes a battery 538 for producing a battery voltage VBATT that may be used to power one or more of the control circuit 530, the rotary encoder circuit 532, the wireless communication circuit 534, the memory 536, and other low-voltage circuitry of the rotary remote control device 520. The rotary remote control device 520 may include a solar cell (not shown) configured to charge the battery 538 and/or another energy storage device, such as a capacitor. The solar cell may be located on a surface of the rotary remote control device 520, for example on the front surface 323 of the front portion 321 of the rotating portion 322 of the rotary remote control device 320 shown in FIGs. 3 and 4.

[0065] The rotary remote control device 520 may include one or more visual indicators, for example one or more LEDs 540, that are configured to provide feedback to a user of the rotary remote control device 520. As shown, the LEDs 540 are operatively coupled to the control circuit 530. For example, the control circuit 530 may control the LEDs 540 to provide feedback indicating a status of the controllable light source 1 10, for example if the controllable light source 1 10 is on, off, or a present intensity of the controllable light source 1 10. The control circuit 530 may be configured to illuminate the LEDs 540 in order to provide an indication that the battery 538 is low on energy, to provide feedback during programming or association of the rotary remote control device 520, and/or to provide a night light. [0066] In response to one or more actuations of the rotary knob coupled to the rotary encoder circuit 532, for example the rotating portion 322 of the rotary remote control device 320, the rotary encoder circuit 532 may generate three control signals that may be provided to the control circuit 530. For example, the rotary encoder circuit 532 may generate a toggle control signal Vxoothat may be representative of instances when the front surface 323 of the front portion 321 of the rotating portion 322 is pushed towards the base portion 325, so as to toggle a controlled electrical load on and/or off. The rotary encoder circuit 532 may also generate a first encoder control signal V_EI and a second encoder control signal V_E2. The first and second encoder control signals V_Ei, V_E2 may, in combination, be representative of an angular velocity ω at which the rotating portion 322 is rotated and an angular direction (e.g., clockwise or counter-clockwise) in which the rotating portion 322 is rotated.

[0067] The control circuit 530 may, responsive to receiving one or more of V_TOG, V_EI, or

V_E2, cause the wireless communication circuit 534 to transmit one or more signals, for example RF signals 108, to a controllable light source associated with the rotary remote control device 520, for example the lighting load of the controllable light source 1 10 shown in FIG. 1. The controllable light source 1 10, responsive to receiving the RF signals 108, may turn the lighting load on or off and/or may adjust the intensity of the lighting load, for example via a load control circuit such as the load control circuit 212.

[0068] FIG. 7 A is a simplified diagram showing example waveforms of the first encoder control signal V_EI and the second encoder control signal V_E2 when the rotating portion 322 is being rotated in the clockwise direction. The first encoder control signal V_EI lags the second encoder control signal V_E2 by 90° when the rotating portion 322 is rotated clockwise. FIG. 7B is a simplified diagram showing example waveforms of the first encoder control signal V_EI and the second encoder control signal V_E2 when the rotating portion 322 is being rotated in the counter-clockwise direction. The second encoder control signal V_E2 lags the first encoder control signal V_Ei by 90° when the rotating portion 322 is rotated counter-clockwise.

[0069] The control circuit 530 may be configured to determine whether the second encoder control signal V_E2 is low (i.e., at approximately circuit common) or high (i.e., at approximately the battery voltage V_BA_TT) at the times of the falling edges of the first encoder control signal V_EI (i.e., when the first encoder control signal V_EI transitions from high to low), in order to determine whether the rotating portion 322 is being rotated clockwise or counter-clockwise, respectively.

[0070] FIG. 8 depicts another example load control system 600. As shown, the load control system 600 is configured as a lighting control system that includes a lamp 610 and a battery-powered rotary remote control device 620. The load control system 600 includes a plug-in load control device 630 (e.g., a "wall wart" plug-in device) configured to be plugged into a standard electrical receptacle 632 that is electrically connected to an AC power source 602. The plug-in load control device 630 may include one or more electrical outlets, such as an electrical outlet 633 located on a side of the plug-in load control device 630.

[0071] The lamp 610 includes a lighting load 612 (e.g., an incandescent lamp, a halogen lamp, a compact fluorescent lamp, an LED lamp, or other screw-in lamp) and an electrical plug 614 that is configured to be plugged into an electrical outlet. The plug 614 is plugged into the electrical outlet 633 of the plug-in load control device 630, such that the plug-in load control device 630 may control the amount of power delivered to, and thus the intensity of, the lighting load 612 of the lamp 610.

[0072] The lamp 610 may include a toggle actuator 616 operative ly coupled to an internal mechanical switch 618 of the lamp 610 that is configured to turn the lighting load 612 on and off. The toggle actuator 616 may be a push-pull-type actuator that may be pushed and pulled to turn the lighting load 612 on and off, a push-push-type actuator that may be pushed to alternately turn the lighting load on and off, or a rotary-type actuator that may be rotated in opposed directions to turn the lighting load on and off. The lamp 610 is not limited to the illustrated table lamp configuration. Alternatively, the lamp 610 may be configured as a floor lamp, a wall mounted lamp, or any other lamp having a toggle actuator, such as the toggle actuator 616.

[0073] As shown, the rotary remote control device 620 is configured to mount over the toggle actuator 616 of the lamp 610 when the toggle actuator is in the on position and the switch 618 is closed (i.e., conductive). The rotary remote control device 620 may be configured to transmit wireless signals, for example RF signals 608, to the plug-in load control device 630 for controlling the amount of power delivered to the lamp 610, and thus the intensity of the lighting load 612. The plug-in load control device 630 includes an actuator 634 that may be actuated to associate the plug- in load control device 630 with the rotary remote control device 620 during a configuration procedure of the load control system 600, such that the plug-in load control device 630 may then be responsive to the RF signals 608 transmitted by the rotary remote control device 620.

[0074] As shown, the rotary remote control device 620 includes a rotating portion 622 and a base portion 625. One or more components of the rotary remote control device 620, for example the rotating portion 622 and the base portion 625, may be made of any suitable material, such as plastic. The rotating portion 622 may be supported by the base portion 625 so as to be rotatable in opposed directions about the base portion 625, for example in the clockwise or counter-clockwise directions. The base portion 625 may be configured to be fixedly attached relative to the toggle actuator 616 of the lamp 610 when the rotary remote control device 620 is mounted over the toggle actuator 616, such that rotation of the rotating portion 622 does not actuate the toggle actuator 616.

[0075] When the rotary remote control device 620 is mounted over the toggle actuator of a switch (e.g., the toggle actuator 616), the base portion 625 may function to secure the toggle actuator 616 from being toggled. For example, the base portion 625 may be configured to maintain the toggle actuator 616 in an on position, such that a user of the rotary remote control device 620 is not able to mistakenly switch the toggle actuator 616 to the off position, which may disconnect the lighting load 612 from the AC power source 602, such that the plug-in load control device 630 is not able to control the lighting load 612.

[0076] The rotary remote control device 620 includes electrical components (not shown) that may be housed inside the rotary remote control device 620. The electrical components of the rotary remote control device 620 may be configured similarly to those of the rotary remote control device 520 shown in FIG. 6. For example, components of the rotary remote control device 620 may include a control circuit, a rotary encoder circuit, a wireless communication circuit, a memory, and a battery. The rotary remote control device 620 may transmit one or more RF signals 608 to the plug-in load control device 630 for controlling the intensity of the lighting load 612 responsive to actuations of the rotating portion 622.

[0077] The plug-in load control device 630, responsive to receiving the RF signals 608, may turn the lighting load 612 on or off and/or may adjust the intensity of the lighting load 612, for example via a load control circuit. For example, the plug-in load control device 630 may turn the lighting load 612 on and off responsive to forces applied to (e.g., presses of) the rotating portion 622 of the rotary remote control device 620 that cause rotating portion 622 to be biased toward the base portion 625. The plug-in load control device 630 may adjust the intensity of the lighting load 612 responsive to one or more rotational forces applied to the rotating portion 622, for example in the clockwise and/or counter-clockwise directions. The plug-in load control device 630 may adjust the intensity of the lighting load 612 in accordance with the rotational speed at which the rotating portion 622 is rotated.

[0078] It should be appreciated that the load control system 600 need not include the plug-in load control device 630 for controlling the lighting load 612. For example, the load control system 600 may alternatively include a controllable light source that is associated with the rotary remote control device 620, for example the controllable light source 1 10 shown in FIG. 1 , that is electrically connected to (e.g., screwed into the socket of) the lamp 610, such that actuations of the rotating portion 622 of the rotary remote control device 620 may adjust the intensity of the lighting load of the controllable light source and/or cause the lighting load of the controllable light source to turn on and/or off. It should further be appreciated that the load control system 100 shown in FIG. 1 may alternatively include a plug-in load control device (e.g., the plug-in load control device 630 shown in FIG. 8) that is configured to be controlled by the remote control device 120.

[0079] It should further still be appreciated that the load control systems 100 and/or 600 may include other types of load control devices and/or electrical loads that are configured to be controlled by one or more remote control devices (e.g., one or more remote control devices 120, 320, 520, and/or 620). For example, the load control systems 100 and/or 600 may include one or more of: a dimming ballast for driving a gas-discharge lamp; a light-emitting diode (LED) driver for driving an LED light source; a dimming circuit for controlling the intensity of a lighting load; a screw-in luminaire including a dimmer circuit and an incandescent or halogen lamp; a screw-in luminaire including a ballast and a compact fluorescent lamp; a screw-in luminaire including an LED driver and an LED light source; an electronic switch, controllable circuit breaker, or other switching device for turning an appliance on and off; a plug-in load control device, controllable electrical receptacle, or controllable power strip for controlling one or more plug-in loads; a motor control unit for controlling a motor load, such as a ceiling fan or an exhaust fan; a drive unit for controlling a motorized window treatment or a projection screen; one or more motorized interior and/or exterior shutters; a thermostat for a heating and/or cooling system; a temperature control device for controlling a setpoint temperature of a heating, ventilation, and air-conditioning (HVAC) system; an air conditioner; a compressor; an electric baseboard heater controller; a controllable damper; a variable air volume controller; a fresh air intake controller; a ventilation controller; a hydraulic valves for use radiators and radiant heating system; a humidity control unit; a humidifier; a dehumidifier; a water heater; a boiler controller; a pool pump; a refrigerator; a freezer; a television and/or computer monitor; a video camera; an audio system or amplifier; an elevator; a power supply; a generator; an electric charger, such as an electric vehicle charger; an alternative energy controller; and the like.

[0080] It should further still be appreciated that while remote control devices configured to transmit wireless control signals to associated electrical load control devices, for example controllable light sources such as the controllable light source 1 10 or the plug-in load control device 630, are described herein with reference to the rotary remote control devices 320, 520, and 620, such remote control devices may be alternatively configured with other suitable control interfaces (e.g. , intensity adjustment actuators), for example a slider or the like. Such a remote control device may include, for example, a base portion configured to mount over the toggle actuator of a switch, a slider operably coupled to the base portion, a wireless communication circuit, and a control circuit communicatively coupled to the slider and to the wireless communication circuit. The slider may be configured to move, for example linearly, with respect to the base portion. For example, the slider may be slidable, for example linearly, relative to the base portion. The base portion may thus be configured to slidably support the slider. The control circuit may be configured to translate a force applied to the intensity adjustment actuator, for example a force applied to the slider, into a signal for controlling the load control device. The control circuit may be configured to cause the wireless communication circuit to transmit the signal.

Claims

1. A remote control device, for use in a load control system having a load control device, the load control device configured to control an amount of power delivered to an electrical load that is electrically connected to the load control device, the remote control device comprising:

a base portion configured to be mounted over a toggle actuator of a mechanical switch that controls whether power is delivered to the electrical load;

a rotating portion supported by the base portion and rotatable about the base portion;

a wireless communication circuit; and

a control circuit operably coupled to the rotating portion and to the wireless communication circuit, the control circuit is configured to translate a force applied to the rotating portion into a control signal that controls the load control device, and is further configured to cause the wireless communication circuit to transmit the control signal.

2. The remote control device of claim 1, wherein the remote control device is configured to be mounted over the toggle actuator when the toggle actuator is in an on position.

3. The remote control device of claim 1, wherein the remote control device is configured so as not to actuate the toggle actuator of the electrical load when the force is applied to the rotating portion.

4. The remote control device of claim 1, wherein the base portion defines an opening configured to receive, and engage with, the toggle actuator of the mechanical switch.

5. The remote control device of claim 4, wherein the base portion defines a plurality of crush ribs that extend into the opening, the crush ribs configured to engage with the toggle actuator of the mechanical switch.

6. The remote control device of claim 4, wherein the base portion includes a friction spring that is configured to engage with the toggle actuator of the mechanical switch.

7. The remote control device of claim 6, wherein the friction spring includes a plurality of fingers that flank opposed sides of the opening.

8. The remote control device of claim 1, further comprising a faceplate that is integral with the base portion, the faceplate defining an opening configured to receive the toggle actuator.

9. The remote control device of claim 1, wherein the base portion is configured to be attached to a faceplate that defines an opening through which the toggle actuator extends.

10. The remote control device of claim 9, wherein the base portion defines a snap fit catch configured to engage within the opening of the faceplate.

11. The remote control device of claim 9, wherein the base portion defines an aperture and the faceplate defines a snap fit catch configured to engage within the aperture.

12. The remote control device of claim 1, wherein the rotating portion is configured to return to an idle position after the force is applied to the rotating portion.

13. The remote control device of claim 1, wherein when the force is a rotational force, the control signal is indicative of a change in the amount of power delivered to the electrical load by the load control device.

14. The remote control device of claim 1, wherein when the force causes the rotating portion to rotate, and the control signal is indicative of a change in the amount of power delivered to the electrical load by the load control device.

15. The remote control device of claim 14, wherein the if the rotational force causes the rotating portion to rotate a distance that does not exceed a predetermined distance, the control signal is indicative of changing the amount of power by a predetermined amount.

16. The remote control device of claim 14, wherein the if the rotational force causes the rotating portion to rotate a distance that exceeds a predetermined distance, the control signal is indicative of continuously changing the amount of power.

17. The remote control device of claim 1, wherein when the force causes the rotating portion to be biased toward the base portion, the control signal indicative of the load control device applying power to, or removing power from, the electrical load.

18. The remote control device of claim 1, wherein when the force causes the rotating portion to be biased toward the base portion, the control indicative of associating the remote control device with the load control device.

19. The remote control device of claim 1, further comprising a power supply configured to power the wireless communication circuit and the control circuit.

20. The remote control device of claim 19, wherein the power supply comprises a battery.

21. The remote control device of claim 20, wherein the power supply comprises a solar cell attached to the rotating portion of the remote control device.

22. A remote control device that is configured to control a load control device, the load control device configured to control an amount of power delivered to an electrical load, the remote control device comprising:

a rotary encoder circuit that is configured to translate a rotational force applied to the remote control device into an input signal;

a control circuit that is communicatively coupled to the rotary encoder circuit and that is configured to receive the input signal and to generate a control signal based upon the input signal; and

a wireless communication circuit communicatively coupled to the control circuit and that is configured to transmit the control signal to the load control device.

23. The remote control device of claim 22, wherein the control signal is indicative of a change of the amount of power delivered to the electrical load by the load control device.

24. The remote control device of claim 22, further comprising a power supply configured to power the rotary encoder circuit, the control circuit, and the wireless communication circuit.

25. The remote control device of claim 24, wherein the power supply is a battery.

26. The remote control device of claim 24, wherein the power supply is a solar cell.

27. The remote control device of claim 22, wherein the communication circuit comprises a radio frequency (RF) transmitter configured to transmit RF signals.

28. A remote control device, for use in a load control system having a mechanical switch coupled in series electrical connection between an alternating current power source and an electrical load, the mechanical switch adapted to be opened and closed in response to actuations of a toggle actuator, the remote control device comprising:

a base portion adapted to be mounted over the toggle actuator of the mechanical switch; an intensity adjustment actuator configured to move with respect to the base portion;

a wireless communication circuit; and

a control circuit operably coupled to the wireless communication circuit, the control circuit is configured to translate a force applied to the intensity adjustment actuator into a signal that controls the load control device, and is further configured to cause the wireless communication circuit to transmit the signal.

29. The remote control device of claim 28, wherein the intensity adjustment actuator comprises a rotating portion supported by the base portion and rotatable about the base portion.

30. The remote control device of claim 28, wherein the intensity adjustment actuator comprises a slider supported by the base portion and configured to slide relative to the base portion.

31. A remote control device, for use in a load control system having a mechanical switch coupled in series electrical connection between an alternating current power source and an electrical load, the mechanical switch adapted to be opened and closed in response to actuations of a toggle actuator, the remote control device comprising:

a base portion that defines an opening configured to engage with a portion of the toggle actuator, such that actuation of the toggle actuator is restrained when the base portion is mounted over the toggle actuator and the portion of the toggle actuator is engaged in the opening; and

an intensity adjustment actuator that is configured to move relative to the base portion.

32. The remote control device of claim 31 , wherein the intensity adjustment actuator comprises a rotating portion that is rotatably supported by the base portion.

33. The remote control device of claim 31, wherein the intensity adjustment actuator comprises a slider that is slidably supported by the base portion.

34. The remote control device of claim 31 , wherein an amount of power delivered to the electrical load is adjusted in response to movement of the intensity adjustment actuator relative to the base portion.

35. A load control system configured to receive power from an alternating current (AC) power source, the load control system comprising:

a controllable light source configured to be receive an AC line voltage from the AC power source, the controllable light source including a lighting load; and

a remote control device that includes a base portion that is configured to be mounted over a toggle actuator of a mechanical switch that controls whether power is delivered to the controllable light source, the remote control device includes an intensity adjustment actuator that is operatively coupled to the base portion and that is configured to move relative to the base portion,

wherein the remote control device is configured to transmit a signal, via wireless

communication, to the controllable light source in response to movement of the intensity adjustment actuator relative to the base portion, and wherein the controllable light source is configured to adjust an amount of power delivered to the lighting load responsive to receipt of the signal.

36. The load control system of claim 35, wherein the controllable light source and the remote control device include respective actuators that may be actuated to associate the controllable light source and the remote control device with each other, such that the controllable light source is responsive to the signal.

37. The load control system of claim 35, wherein the intensity adjustment actuator comprises a rotating portion supported by the base portion and rotatable about the base portion.

38. The load control system of claim 35, wherein the intensity adjustment actuator comprises a slider supported by the base portion and configured to slide relative to the base portion.

39. The load control system of claim 35, wherein the remote control device is a battery-powered remote control device.

40. A method of retrofitting a load control system for wireless control, the load control system including a mechanical switch coupled in series electrical connection between an alternating current (AC) power source and a socket, the method comprising:

installing a controllable light source in the socket;

mounting a remote control device over a toggle actuator of the mechanical switch; and associating the controllable light source and the remote control device with each other, such that the controllable light source is responsive to a signal transmitted to the controllable light source by the remote control device via wireless communication.

41. The method of claim 40, further comprising:

prior to mounting the remote control device over the toggle actuator, switching the toggle actuator to an on position, such that the controllable light source is electrically coupled to the AC power source.

42. The method of claim 40, wherein the associating the controllable light source and the remote control device with each other comprises actuating respective actuators of the controllable light source and the remote control device.