Integrated lighting system and method

Abstract

System and method include luminaires, control switches, occupancy detectors, and photocells connected to central control module for setting up, testing, commissioning and maintaining the system. Memory card interface and associated memory card provided for loading, saving and/or transferring configuration, update firmware, and log system operation data, which can be automatically recognized to perform appropriate actions. System and method provide switching between different mutually exclusive lighting modes where lighting of each mode is sequenced such that second lighting mode is initiated before first mode is terminated, resulting in continuity of lighting in controlled area. Other features include daylight harvesting control with multiple zone dimming and switching, programmable attack and decay dimming rates, ability to return system to previous dimming level after lights have been turned off, and ability to start controlled lights at full light level then dim down to previous level to ensure lighting ballasts have sufficient start up voltage.

Claims

1. A lighting system comprising: a plurality of high voltage devices grouped into a plurality of zones; a plurality of low voltage devices, wherein at least one of the low voltage devices is associated with at least one of the zones; a central control module including a first low voltage connection to at least one of the low voltage devices and a high voltage connection to at least one of the high voltage devices; a user interface coupled to the central control module, for performing at least one selected from the group consisting of setting up, testing, commissioning and maintaining of at least one of the high voltage devices and at least one of the low voltage devices connected to the central control module; and a portable memory device storing one or more of system configuration data, firmware data and system operation data.

2. The system of claim 1 further comprising: a memory interface, coupled to the central control module and enabling communication of any of said system configuration data, firmware data and system operation data to said central control module.

3. The system of claim 1, wherein at least one of the high voltage devices includes a luminaire.

4. The system of claim 1, wherein the central control module further includes a second low voltage connection to at least one of the high voltage devices, and the central control module receives at least one first control signal as input via the at least one first low voltage connection and outputs at least one second control signal via the at least one second low voltage connection.

5. The system of claim 4, wherein the at least one of the high voltage devices includes a light source, and the at least one second control signal is indicative of light level output of the light source.

6. The system of claim 1, wherein the high voltage devices are grouped into a plurality of zones, the high voltage devices in at least one of the zones receiving a high voltage output from the high voltage connection based on input to the central control module from the first low voltage connection.

7. The system of claim 6, wherein at least one of the low voltage devices is associated with the at least one of the zones.

8. The system of claim 6 comprising a plurality of high voltage connections, wherein the high voltage devices receive high voltage outputs from the high voltage connections, respectively in the zones, the low voltage devices are respectively associated with the zones, and the central control module regulates the high voltage outputs to the high voltage devices in the zones, respectively, based on the input from the low voltage connections associated with the low voltage devices.

9. The system of claim 1, wherein the plurality of low voltage devices includes at least one of a control switch, an occupancy detector, and a photocell.

10. A control module comprising: a line voltage input; a low voltage section including a controller and a plurality of first low voltage connections; a high voltage section including a plurality of high voltage connections; and a portable memory interface receiving data from a portable memory, the data including one or more of system configuration data, firmware data and system operation data, wherein the first low voltage connections receive first control signals as input to the controller, and the controller regulates the line voltage output on the plurality of high voltage connections based on the first control signals to perform at least daylight harvesting control, wherein at least one of the first low voltage connections is associated with at least one of a plurality of rows of lighting fixtures.

11. The control module of claim 10, wherein the first control signals comprise at least one of an ON/OFF signal, a dimming light level signal, an ambient light indication signal, and an occupancy indication signal and said daylight harvesting control includes controlling said dimming light level signal based on said ambient light indication signal.

12. The control module of claim 11, wherein said daylight harvesting control includes delaying a control signal for said controlling said dimming light level with a first delay value when said ambient light indication signal indicates a decrease in ambient light and a second delay value larger than said first delay signal when said ambient light indication signal indicates an increase in ambient light.

13. The control module of claim 12, wherein the high voltage connections supply the regulated line voltage to high voltage devices and the second low voltage control signals regulate operation of the high voltage devices.

14. The control module of claim 13, wherein at least one of the high voltage devices includes a luminaire, and at least one of the second low voltage control signals regulates a dimming operation of the luminaire.

15. A lighting control method comprising the steps of: receiving first low voltage control signals; providing a high voltage output to a plurality of light fixtures grouped into a plurality of zones, wherein at least one low voltage device is associated with at least one of the zones; and configuring a control module to process the first low voltage control signals received as input and to regulate the high voltage output according to the first low voltage control signals; and performing daylight harvesting control to increase an amount of light output from at least one light fixture of the plurality of light fixtures when an ambient amount of light decreases and decreasing the amount of light output from at least one light fixture when the ambient amount of light increases, wherein the configuring step includes at least one of inputting configuration information to the control module via a user interface coupled to the control module, and uploading configuration information from a portable memory device via a memory interface of the control module and wherein further, said portable memory device stores said configuration data and is used to similarly configure additional control modules with the same information.

16. The method of claim 15, wherein the first low voltage control signals comprise at least one of ON/OFF signal, dimming light level signal, ambient light indication signal, and occupancy indication signal.

17. The method of claim 16, further comprising providing a second low voltage control signal to the at least one light fixture to affect light level output of the at least one fixture.

18. The method of claim 17, wherein the configuring step further comprises setting the configuration of the control module to output the second low voltage control signals to regulate the operation of the at least one light fixture.

19. The method of claim 18, wherein the second low voltage control signal is indicative of the light level output of the at least one light fixture.

20. The method of claim 15, further comprising storing the configuration information on a non-transient memory medium.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) A more complete appreciation of the present invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:

(2) FIG. 1 provides a block diagram of a system according to an exemplary embodiment of the present invention.

(3) FIG. 2 provides a block diagram of a user interface for a control module according to an exemplary embodiment of the present invention.

(4) FIG. 3 provides conceptual diagrams of switching stations according to exemplary embodiments of the present invention.

(5) FIGS. 4A-4C are perspective views of a control module according to an exemplary embodiment.

(6) FIG. 5 is a top view of the control module of FIG. 4C.

(7) FIG. 6 provides an illustrative drawing of a control module according to an exemplary embodiment of the present invention and exemplary connections of such module to various components of a system according to embodiments of the present invention.

(8) FIGS. 7A-7C provide block diagrams of systems according to exemplary embodiments of the present invention.

(9) FIGS. 8A-8E are detailed circuit diagrams illustrating components of a relay board according to exemplary implementations of the present invention.

(10) FIGS. 9A-1 and 9A-2 illustrate a microprocessor for use in a logic control board of a controller according to exemplary embodiments of the present invention.

(11) FIGS. 9B-1-9J are detailed circuit diagrams of various components of a circuit board according to exemplary embodiments of the present invention.

(12) FIGS. 10A and 10B are circuit diagrams of an example of a switch control circuit according to exemplary embodiments of the present invention.

(13) FIG. 11 provides a graphical illustration of an output of a photo sensor according to an exemplary embodiment of the present invention.

(14) FIG. 12 provides tabular illustrations of calculations for controlling lighting based on photo sensor output according to exemplary embodiments of the present invention.

(15) FIG. 13 provides tabular illustrations of calculations to for controlling lighting based on photo sensor output according to exemplary embodiments of the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

(16) Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, embodiments of the present invention are shown in schematic detail.

(17) The matters defined in the description such as a detailed construction and elements are nothing but the ones provided to assist in a comprehensive understanding of the invention. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, well-known functions or constructions are omitted for clarity and conciseness. Exemplary embodiments of the present invention are described below in the context of a classroom application. Such exemplary implementations are not intended to limit the scope of the present invention, which is defined in the appended claims.

(18) According to exemplary embodiment of the present invention, a system and method are provided where a classroom lighting control solution includes the following components, as illustrated in the example of FIG. 1:

(19) Classroom Control Module 100

(20) Master ON/OFF Switch Station 102

(21) Row ON/OFF Switch Stations (Rows 1-4) 104a, 104b, 104c and 104d, respectively

(22) Gen—A/V Switch Station 106

(23) AV Raise/Lower Switch Station 108

(24) Whiteboard ON/OFF Switch Station 110

(25) Quiet Time Switch Station 112

(26) Auto (Daylight Harvesting) Switch Station 114

(27) Occupancy Sensors (one or more) 116a, 116b, 116c

(28) Indoor Photo Sensor 118

(29) Classroom Control Module 100:

(30) In an exemplary implementation, a classroom control module 100 contains all of the switching and dimming components necessary for the control of an entire classroom lighting system 10. The classroom control module can be designed to control up to four individual rows of recessed or pendant mounted lighting fixtures 120a, 120b, 120c, 120d (with alternate switching of A/V and General lighting modes and individual row control) and one Whiteboard lighting circuit 122 with ON/OFF control.

(31) The classroom control module can be provided with the following:

(32) Control of 1 to 4 Rows of recessed or pendant mounted fixtures 120a, 120b, 120c, 120d each with General and A/V lighting circuits

(33) Control of 1 Whiteboard 122 circuit ON/OFF

(34) 1-0-10 VDC Dimming output A/V 126

(35) 4-0-10 VDC Dimming output GEN daylight harvesting 124a, 124b, 124c, 124d (1-output may be sufficient. 4-outputs would allow more flexible functionality)

(36) ON/OFF daylight harvesting via row switching with selectable row control (rows 1-4)

(37) In an exemplary implementation, the classroom control module 100 can be provided with a user interface 200 including, for example, a display 202 (such as a 2 line by 16-character display) with, for example push buttons 204a, 204b for screen navigation, and buttons 206a and 206b for selection of menu items. Other user interfaces, such as touch screens to facilitate ease of operation, can be implemented and are within the scope of the present invention.

(38) The classroom control module 100 can also include an interface for connection to other lighting control systems to provide for programming and scheduling accordingly.

(39) In an exemplary implementation, the classroom control module 100 can be provided with a maintained dry contact input to cause the classroom control module to go to a demand response mode. In the demand response mode, the classroom control module 100 limits the output of general and AV lighting modes to the demand response level as set at the classroom control module 100. Demand response levels can be set by means of the user interface 200 of the classroom control modules 100, as later described in further detail in the context of certain exemplary implementations.

(40) General—A/V Switching Control:

(41) A classroom control module 100 can be designed to allow classroom lighting to be in either the General or A/V modes and ensure that both modes may never be ON at the same time. Selection of current mode can be provided by means of momentary low voltage inputs.

(42) Row Switching Control:

(43) A classroom control module 100 can allow for individual or master ON/OFF control of 1 to 4 rows of General—A/V lighting. Control can be provided by means of momentary low voltage inputs.

(44) Raise/Lower Control:

(45) A classroom control module 100 can provide a 0-10 VDC output for A/V dimming control. Control can be provided by means of momentary low voltage inputs.

(46) Whiteboard ON/OFF Control:

(47) A classroom control module 100 can provide for ON/OFF control of a single whiteboard 122 circuit. Control can be provided by means of momentary low voltage inputs.

(48) Quiet Time:

(49) A classroom control module 100 can provide for a quiet time override. The quiet time override can inhibit the occupancy OFF command for a period of 60 minutes. At the end of the quiet time duration the control module can return control to the occupancy sensor and turn lighting OFF if no occupancy is present in the classroom.

(50) Occupancy Sensor Control:

(51) A classroom control module 100 can allow for the connection of one or more occupancy sensor(s), for example 3 occupancy sensors 116a, 116b, 116c. The control module 100 can provide power and receive inputs from the occupancy sensors 116a, 116b, 116c in order to determine the current state of occupancy of the classroom—either occupied or unoccupied. Upon a change from unoccupied to occupied states the classroom control module 100 can switch the classroom lighting to the general mode, turn all rows ON and engage automatic daylight harvesting if present. Upon a change from occupied to unoccupied states, the classroom control module 100 can switch all lighting OFF.

(52) General Lighting Continuous Dimming Daylight Harvesting Control:

(53) A classroom control module 100 can receive current daylight level information from an indoor photo sensor 118. According to an exemplary implementation, a function of a daylight harvesting sensor, such as indoor photo sensor 118, is to monitor incoming daylight, calculate the appropriate levels that the general artificial lighting may be dimmed to save energy while maintaining desires foot-candle levels at task and send a 0 to 10 VDC signal to the general lighting to dim it to the appropriate level. To accomplish this a classroom control module can be implemented to receive and process information and operate as follows:

(54) A. Current Incoming Daylight Level:

(55) This information can be received from an indoor photo sensor 118 as a linear signal from 0 to 10 VDC in 4 possible ranges 0.3 to 30 fc, 3 to 300 fc, 30 to 3000 fc and 60 to 6000 fc as shown in the graph of FIG. 11.

(56) Software can be designed to have the sensor set to the 30 to 3000 fc range.

(57) B. Current Daylight Contribution: (Daylight Read at Task):

(58) Current daylight contribution readings for zones 1-4 as read at task during the mid portion of the day with the artificial lighting turned off. Daylight readings taken can be entered into a classroom control module 100 by means of a user interface 200. Daylight lighting levels should be entered for each daylight harvesting zone being controlled. If a daylight harvesting zone will not be used there is no need to enter a level for it.

(59) C. Designed or Measured Artificial Lighting Level (Designed Levels or Actual Artificial Lighting Levels as Read at Task):

(60) Artificial lighting design or measured levels for zones 1-4 can be entered into the classroom control module 100 by means of the user interface 200. As in the case of daylight, artificial lighting levels should to be entered for each daylight harvesting zone being controlled. If a daylight harvesting zone will not be used there is no need to enter a level for it.

(61) D. Operation: In order to set the classroom control module's daylight harvesting settings a user can perform the following steps. 1. Turn off the artificial lighting. 2. Take readings during the mid portion of the day of the actual daylight fc level at task with a light meter. 3. Input the measured daylight fc level into classroom control module 100 via user interface 200. 4. Input design fc level into the classroom control module 100 via user interface 200. This may be accomplished by inputting designed levels or by taking measurements of actual artificial lighting levels with no daylight present.
Once the above steps are completed, the classroom control module 100 can calculate the daylight conversion factor and begin outputting the appropriate dimmed level (0 to 10 VDC) to the general lighting. An example of such calculations is illustrated in a table of FIG. 12.

(62) E. Dimming Response (Fade Up and Fade Down Rate):

(63) The controller 100 can be designed to respond quickly to decreases in natural daylight and more slowly to increases in natural daylight. The exact rate of these changes can be adjusted during testing, once determined these values can be entered into the controller 100 as default values. These values can also be adjustable by via user interface 200.

(64) F. Response Delay:

(65) In order to keep sudden temporary changes in daylight from causing output the sensor 118 to needlessly change the dimmed level of its controlled fixtures, the sensor 118 can have built-in delays to numb the effects of sudden changes in daylight. For example, sensor 118 can have two built-in delays: one for reacting to decrease in daylight and one for reacting to an increase in daylight. The default delay for reacting to increases in daylight can be set to, for example, 10 seconds and the default delay for reacting to decreases in daylight can be set to, for example, 2 seconds. These values can also be adjustable via the user interface 200.

(66) General Lighting Switched Row Daylight Harvesting Control.

(67) According to another exemplary implementation, a function of the daylight harvesting sensor 118 is to monitor incoming daylight, calculate the appropriate levels at which individual rows of the general artificial lighting may be switched OFF to save energy while maintaining desires foot-candle levels at task. To accomplish this, a classroom control module 100 can be implemented to receive and process information and operate as described above in the context of General Lighting Continuous Dimming Daylight Harvesting Control Section, Parts A through F. However, in this exemplary implementation operation step 4 of Part D is replaced by the following step: 4. Input design fc level into the Classroom Control Module. This may be accomplished by inputting designed levels or by taking measurements of actual artificial lighting levels with no daylight present.
Once the above steps are completed the Classroom Control Module 100 calculates the daylight conversion factor and begins control of the artificial general lighting by switching ON and OFF rows of artificial lighting as needed. An example of such calculations for a row #1 of artificial lighting is illustrated in a table of FIG. 13.

(68) According to an exemplary implementation of certain embodiments of the present invention, a control module 100 can be generally configured as illustrated in FIGS. 4A-4C, 5 and 6, where: 1. Enclosure 400 can be metal to allow for simple connection of field conduit or other wiring system to control module 100. 2. Enclosure 400 size can be as small as functionally possible. 3. Enclosure 400 can be NEMA 1 enclosure designed and rated for plenum installation. 4. Enclosure 400 can be finished in a color so as to uniquely identify it from other such enclosures that may be mounted in the classrooms plenum. 5. Enclosure 400 can be designed to easily mount to, for example, plywood backing 6. Removable screw 404 can be used to secure cover 402 of enclosure 400, which may also be hinged and/or configure to lock, and includes openings 406 for wiring. 7. The design can allow the installing contractor adequate access to mount the enclosure 400 and access all required terminals, e.g., 410 and 420 for installation and connection of field wiring. 8. Line voltage electrical connections can be made to appropriately labeled terminal blocks 420 designed to accept standard field wiring. 9. Enclosure 400 can be provided with, for example color coded, RJ45 and RJ 11 connectors 410 for the connection of switch stations and low voltage connection to lighting fixtures. 10. Enclosure 400 can have individually labeled RJ45 connectors 410 for each switch station type for simple Plug and Play connection of remote switch stations. 11. Enclosure 400 can be provided with, for example 4, RJ 11 connectors 410 appropriately labeled for general lighting daylight harvesting. 12. Enclosure 400 can be provided with, for example 1, RJ11 connector appropriately labeled for A/V lighting dimming control. 13. Enclosure 400 can be configured to receive 120/347 VAC 50/60 Hz—universal input voltage via access opening 408. 14. Line voltage electrical connection can be made to terminal blocks 420 via openings 406 designed for use with 16 to 10 gauge wire. 15. Class 2 electrical connection can be made via plug-in connectors 410, such as type RJ45 or RJ11 connectors.

(69) As further illustrated in the exemplary implementations of FIGS. 4A-4C and 5, enclosure 400 includes a low voltage (class 2) section 412 and a high voltage section 414 separated by high voltage I class 2 barrier 416. A transformer 418 provided in section 414 supplies power to low voltage components of section 414. User interface 430, such as a user interface 200 of FIG. 2, including display 432 and controls (e.g., menu navigation keys) 434, is configured in section 412. On the other hand, switching relays 422 and terminal blocks 420 are configured in high voltage section 414.

(70) As further illustrated in the exemplary implementations of FIG. 6, a plurality of bus lines, each having a specific function, such as switching 602, detecting 604, or diming control 606, connect to controller 100. Controller 100 receives live voltage input 610 and supplies it to light fixtures via wiring 608 connected to terminal blocks 420.

(71) According to an exemplary embodiment, the nodes being controlled get their intelligence from the system and are coupled to a particular sensor, such as an indoor photo sensor 620 and occupancy sensor 622, or a switch, such as GEN-A/V switch 630 and dimming switch 632; each is attached to proper node and can be color coded to prevent mixing during installation. In the example of dimming control, dimming signals pass through the control module 100 for added intelligence, such as timing of light level, before being sent to light fixtures 640,642 by means of low voltage dimming control 606.

(72) According to exemplary embodiment, low voltage switch stations, such as 102, 104a-d, 106, 108, 110, 112 and 114 of FIG. 1, can be implemented as generally illustrated in FIG. 3, where the switching station is, for example, designed to fit into a single gang electrical box and can be used with a standard plate cover, and multiple switch stations may be installed into a single multi gang junction box with a multi gang cover plate. Exemplary operations and functionality provided by such switch stations are as follows:

(73) GEN-AIV Switch Station

(74) GEN-A/V Switch Station allows a user to select between general and A/V lighting modes and can be implemented as a single gang switch station with 2 momentary push buttons GEN and AV 300 connected to controller 100 via, for example, plug-in class 2 electrical connector such as RJ45, where in operation: 1. When the GEN switch is momentarily depressed the controller 100 turns the A/V lighting OFF and turns the General lighting ON. 2. When the A/V switch is momentarily depressed the controller 100 switches the General lighting OFF and turns ON the A/V lighting. 3. Controller 100 can be configured such that at no time the controller 100 allows for both General and A/V lighting to be in the ON state. 4. When A/V dimming is in use, A/V lighting is configured to switch ON and OFF at current dimmed levels. (Last level). 5. When general lighting daylight harvesting is in use general lighting can be configured to switch ON and OFF at levels determined by daylight harvesting.

(75) Master ON/OFF Switch Station

(76) Master ON/OFF switch station allows a user to turn all lighting rows ON and OFF and can be implemented as a single gang switch station 302 with 1 momentary push button ON/OFF connected to controller 100 via, for example, plug-in class 2 electrical connector such as RJ45. During operation, when the ON/OFF switch is momentarily depressed the controller alternately switches all Rows ON and OFF.

(77) Row ON/OFF Switch Station: (Rows 1-4)

(78) Row ON/OFF switch station allows a user to turn all lighting rows ON and OFF and can be implemented as a single gang switch station 302 with 1 momentary push button ON/OFF connected to controller 100 via, for example, plug-in class 2 electrical connector such as RJ45. During operation, when the ON/OFF switch is momentarily depressed the controller alternately switches the controlled Row 1-4 ON and OFF.

(79) Raise/Lower Switch Station

(80) Raise/Lower Switch Station allows the system user to raise and lower A/V lighting levels and can be implemented as a single gang switch station with 2 momentary push buttons Raise and Lower 304 connected to controller 100 via, for example, plug-in class 2 electrical connector such as RJ45, where in operation: 1. When the Raise switch is momentarily depressed the controller raises the current A/V lighting level 1 step. 2. When the Lower switch is momentarily depressed the controller lowers the A/V lighting level 1 step. 3. If the Raise or Lower push button is depressed for more than 1 second the classroom control module 100 raises or lowers the A/V lighting level 1 step every 500 ms until the maximum or minimum level is reached. 4. A/V dimming for 0 to 100% can be provided in 10 even steps. 5. Once the controller has reached it maximum or minimum level, repeated presses of the Raise or Lower push button can be configured to have no effect on A/V lighting levels.

(81) Whiteboard Switch Station

(82) Whiteboard switch station allows a system user to turn ON or OFF the Whiteboard lighting and can be implemented as a single gang switch station 302 with 1 momentary push button Whiteboard 306 connected to controller 100 via, for example, plug-in class 2 electrical connector such as RJ45. During operation, when the Whiteboard switch is momentarily depressed the controller alternately switches the Whiteboard lighting ON and OFF.

(83) Quiet Time Switch Station

(84) Quit Time switch station allows a system user to temporarily override the occupancy sensors OFF command and can be implemented as a single gang switch station 302 with 1 momentary push button Quite Time 308 connected to controller 100 via, for example, plug-in class 2 electrical connector such as RJ45, where in operation: 1. When the Quiet Time switch is momentarily depressed the controller 100 overrides/inhibits the occupancy sensors OFF command for a period of 60 minutes. 2. If the Quiet Time switch is momentarily depressed during the Quiet Time the Quiet Time is reset to 60 minutes. 3. If the Quiet Time switch is pressed and held for a period of 10 seconds the Quiet Time override period is ended and the occupancy sensor OFF inhibit is removed allowing the occupancy sensor to turn lighting OFF when occupancy is no longer detected.

(85) Auto (Daylight Harvesting) Switch Station

(86) Auto switch station allows a system user to command the system go into the general lighting daylight harvesting mode, and can be implemented as a single gang switch station 302 with 1 momentary push button Auto 310 connected to controller 100 via, for example, plug-in class 2 electrical connector such as RJ45. During operation, when the Auto switch is momentarily depressed the controller goes into the General lighting daylight harvesting mode and dims the general lighting as commanded by the controller 100.

(87) A system may include any number of GEN-A/V, ON/OFF, Raise/Lower, Whiteboard, Quite Time, or Auto switch stations.

(88) Exemplary implementations of lighting systems according to embodiments of the present invention are illustrated in FIGS. 7A-7C. For example, FIG. 7A illustrates a system deployed in a classroom setting 700, where the system provides ON/OFF control for White Board 702 by controlling light output of fixture 704, as well as control of General and A/V lighting by controlling light output of fixtures 706. For such systems, switch stations may include: an ON/OFF control station 708, which can be disposed near classroom entrance; and/or a teacher control station 710, which can be disposed near the White Board. Commands from stations 708 and 710 are communicated to a control module 100 via low voltage cables, and control module 100 supplies power from a main feed to fixtures 704 and 706, accordingly, via line voltage connections. Occupancy sensors 712 connected to control module 100 via low voltage cables provide additional lighting control, such as automatic light shut off after no occupancy has been detected for a period of time.

(89) In the example of FIG. 7B, the system further provides for dimming control, such that control module 100 provides dimming control to fixtures 706 as a low voltage dimming signal on line 714. For example, teacher station 710 may include a dimming switch which provides dimming control information to module 100, which in turn generates a dimming signal on line 714 accordingly. On the other hand, dimming control may be automatic, based on for example occupancy presence or absence, or a time out period.

(90) In the example of FIG. 7C, the system further provides for general lighting daylight harvesting where an indoor photo sensor 718 provides control information via a dedicated low voltage cable to control module 100 accordingly. Also dimming control is further enhanced by proving dimming signals on line 714 and 716 to rows of fixtures 706. Automatic and manual dimming control, as well as general lighting with A/V dimming and general lighting daylight harvesting have been described above, and are applicable in the implementation of the system illustrated in FIG. 7C.

(91) FIGS. 8A through 10 provide detailed circuit diagrams illustrating exemplary implementations of the various components of systems according to exemplary embodiments of the present invention. For example, FIG. 8A-8E illustrate components of a relay board comprising a plurality of electromechanical relays for use in control module 100, as illustrated, for example in FIG. 5. FIG. 9A generally illustrates a microprocessor for use in a logic control board of controller 100 described above. FIGS. 9B-9J include circuit diagrams of various components of the circuit board including: user interface (see FIG. 9C); USB slave and SD card circuits (see FIG. 9D); power supply and regulation circuits (see FIG. 9E); various input circuits (see FIGS. 9F and 9G); dimming control circuits (see FIG. 9H); and sensor circuits (see FIG. 9I). FIG. 10 provides an example of a switch control circuit according to an embodiment of the present invention.

(92) In an advantageous exemplary implementation of certain embodiments of the present invention, a removable SD card can be configured with the controller 100. The SD Card enables, for example:

(93) Firmware upgrades in the field

(94) Easy replication of device configuration

(95) Logging for: debug functional verification

(96) audit trails for: installation/commissioning setup for LEEDS/CHIPS compliance evidence of energy savings

(97) In another advantageous exemplary implementation of certain embodiments of the present invention, when switching among various lighting configurations within a fixture a configuration is provided to ensure the affected area is never completely without light. For example, rather than switching OFF the current configuration, then switch ON the new configuration, which leaves a period of time (e.g., a few seconds with fluorescent lights) when the area is not lit at all, a configuration according to an exemplary embodiment of the present invention facilitates switching ON the new configuration before switching OFF the old one.

(98) Numerous additional modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the present invention may be practiced otherwise than as specifically described herein.