Patent Publication Number: US-2020300449-A1

Title: Light diagnostics and monitoring using wearables

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of and priority to U.S. Provisional Patent Application Ser. No. 62/822,283, filed Mar. 22, 2019 and entitled “LIGHT DIAGNOSTICS AND MONITORING USING WEARABLES,” the entirety of which is incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     This disclosure generally relates to a field of optical communication, and in particular relates to light diagnostics, monitoring, commissioning and control of equipment using wearable devices, such as smart glasses, watches, or other devices worn on the body of a technician. 
     BACKGROUND 
     Facilities, such as buildings, may have complex lighting systems that are used to both provide light and to monitor and manage nearby devices. Because of the complexity of these systems, including the sheer volume of devices involved, diagnosis and monitoring of the facilities becomes quite challenging. 
     A lighting system may have numerous devices that operate in concert to drive the system. For example, a lighting system for a building may comprise thousands of switches, occupancy sensors, light control panels, and/or light fixtures configured to hold artificial light sources, such as light bulbs or light emitting diodes (LEDs). In another example, a security system for a building may have numerous electronic locks, surveillance cameras, motion sensors, and so on. Further, each device in the system may have different default or programmed settings. Furthermore, in today&#39;s world, each of these devices may be digitally addressable to provide a more efficient method to control the settings of the devices. 
     Monitoring, managing, diagnosing, or controlling an operation of the system may demand controlling a setting of one or more devices from the number of devices associated with the system. To control the settings of the one or more digital devices, initially a user may have to determine the settings of each of the devices of interest. However, to determine the settings of the one or more devices of interest, conventional technology may need a user to manually locate each of the specific devices of interest, and manually determine the digital address associated with the device of interest. Further, the user may have to determine where information regarding the setting of the located device of interest is stored, and access the information from the location using the digital address. Alternatively, conventional technology may need a user to access spreadsheets or databases that store the locations to manually locate the one or more devices and view its settings. Thus, accessing information associated with a device in a system using conventional technology may be cumbersome, time consuming, and prone to errors. Further, as the number of devices in the system increases, accessing information associated with a specific device using conventional technology may become increasingly unwieldy. 
     In addition, once the settings associated with the one or more devices are determined, conventional technology may lead a user to access a control system to change a setting of the one or more devices. The control system may be coupled to the one or more devices over a network backbone or over the Internet. Further, the user has to have specific knowledge of the functioning of the control system to change the settings associated with the one or more devices. Alternatively, conventional technology provides a graphical user interface (GUI) that is incorporated into each device that needs to be controlled. 
     For example, U.S. Pat. No. 9,510,427, issued on Nov. 29, 2016, and incorporated herein in its entirety, provides an artificial light source based messaging platform. The artificial light source based messaging platform can be used to view data associated with a device as well as control one or more characteristics of the device, such as settings of the device. 
     SUMMARY 
     The present disclosure relates, in one aspect to a device for monitoring equipment associated with a light source. The device includes a light detection sensor, a user interface device, and a controller operably coupled to the light detection sensor and the user interface device. The controller monitors a plurality of light sources for an availability status indication. The plurality of light sources includes the light source. The controller determines, from the status data availability indication, that status data of the equipment is available from the light source. The controller receives a modulated light signal from the light source. The controller decodes the modulated light signal into decoded status data. The controller determines a status of the equipment based on the decoded status data. The controller processes the decoded status data to determine a diagnosis of the equipment. The controller indicates via the user interface device the diagnosis of the equipment and a diagnostic action related thereto. 
     In another aspect, a wearable device for monitoring equipment a light fixture is presented. The wearable device includes a light detection sensor, a display comprising a graphical user interface, and a controller operably coupled to the light detection sensor and the display. The controller receives a modulated light signal from the light source. The controller decodes the modulated light signal into decoded status data. The controller determines a status of the equipment based on the decoded status data. The controller processes the decoded status data to determine a diagnosis of the equipment. The controller displays via the graphical user interface device the diagnosis of the equipment and a diagnostic action related thereto. 
     In a further aspect, a light fixture is presented. The light fixture includes a light source and a controller operably coupled to the light source, The controller is configured to receive status data from equipment, encode the status data in a modulated light signal, and output the modulated light signal using the light source. 
     The above embodiments are exemplary only. Other embodiments are within the scope of the disclosed subject matter. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Example embodiments are illustrated by way of example and not limitation in the figures of accompanying drawings, in which: 
         FIGS. 1A &amp; 1B  are flowcharts depicting techniques in which wearable devices are used to monitor various equipment deployed in a facility, according to certain example embodiments of the present disclosure. 
         FIG. 1C  illustrates an example operational environment of the artificial light source based messaging platform, according to certain example embodiments of the present disclosure. 
         FIGS. 2A and 2B  (collectively referred to as “ FIG. 2 ”) illustrate block diagrams of a light based message transceiver unit, according to certain example embodiments of the present disclosure. 
         FIG. 3  illustrates process flow diagrams of one or more methods of communicating data associated with a device using the artificial light source based messaging platform, according to certain example embodiments of the present disclosure. 
         FIGS. 4A and 4B  (collectively referred to as “ FIG. 4 ”) illustrate a process flow diagram of another method of communicating data with a device using the artificial light source based messaging platform, according to certain example embodiments of the present disclosure. 
     
    
    
     Many aspects of the invention can be better understood with reference to the above drawings. The elements and features shown in the drawings are not to scale, emphasis instead being placed upon clearly illustrating the principles of example embodiments of the present invention. Moreover, certain dimensions may be exaggerated to help visually convey such principles. In the drawings, reference numerals designate like or corresponding, but not necessarily identical, elements throughout the several views. Other features of the present embodiments will be apparent from the Detailed Description that follows. 
     DETAILED DESCRIPTION 
     The present disclosure relates to techniques in which wearable devices are used to monitor, diagnose, control, and manage equipment within one or more large facilities. The techniques make use of messages that are sent from light sources (e.g., of light fixtures) to wearable devices worn by, for example, technicians. Further enabling details of the messaging between light sources and the wearable devices is provided below with respect to  FIGS. 1C-4B . 
     Typical lighting systems operate independent of other process or support functions within a facility, such as the functions used to monitor and manage computer assets. 
     For example, the commissioning process of connected lighting systems includes matching MAC addresses of light fixture to their physical location. This conventional process relies on installer to keep track of MAC IDs with the lighting layout drawings, which requires manual intervention. However, as light fixtures are mounted outside the visual range of any markings or labels on the fixture may not be visible, making commissioning difficult. Advantageously, as presented herein, a light fixture that transmits its MAC ID which is then detected by a wearable can reduce the commissioning time and project management effort significantly. Further advantages of the present disclosure include a wearable that also has wireless capability that can communicate with a specific MAC ID it receives through the connected lighting software portal. The precise identification of the fixture is possible by requesting specific MAC ID to perform an action (flashing, color change etc.). Such communication could then be validated by the user who is wearing the wearable device using the signaling techniques disclosed herein. 
     In addition, the independent operation of lighting may be driven by the location of lighting relative to other systems. Often the lighting is 10-40 feet up in the air making accessibility very difficult, time consuming and expensive. When a specific luminaire fails or operates out of specification, it can be very labor intensive to locate the failed device within a large facility if the error can be detected at all. While connected lighting is growing in adoption in residential and commercial applications it is still in the infancy stage in industrial applications. 
     Disadvantageously, if a facility waits for a light to fail catastrophically before changing the light, there is a substantial risk that users may unknowingly be operating the lighting system outside it&#39;s specification making the operating or failure condition unsafe. But, locating failed fixtures is extremely time consuming and inefficient due to the lack of tools directed to such diagnosis and monitoring. 
     To overcome these challenges, the present disclosure provides techniques for allowing rapid deployment of maintenance personals to quickly diagnose problems either with light fixtures themselves, or with equipment associated with light fixtures. Advantageously, the use of sub-visible signals sent from the light fixtures and received by sensors on wearable devices allows for technicians to diagnose problems and receive status information directly from impacted equipment. Notably, communication using light is not limited to the use of general illumination, e.g., luminaires, and includes using indicator lights, etc. For example an indicator light in a panel can be used to transfer diagnostics data to wearable without opening the panel. Advantageously, the light communication described herein can minimize the potential of an arc flash hazard by providing optical isolation of components. 
     By way of example,  FIG. 1A  is a flowchart depicting an exemplary method  10  for monitoring or diagnosing equipment. In an embodiment, the method  10  at block  510  is configured to receive, by a first controller of a light fixture, status data of equipment being monitored. For example, the status data may be received using a wireless or wired communication from nearby equipment that is being monitored. In another example, the light fixture itself may be the equipment being monitored. 
     In one embodiment, the technician would potentially point the wearable to pinpoint the device with the fault. He could also have a map that could show which light sent the message based on its serial number. In such a case, the communication to the wearable is a line of sight communication, but multiple signals from multiple light fixtures can be observed concurrently by sampling the sensor data. In this example, the wearable does not need to be narrowly focused at one light fixture. Likewise, status or any desired indication can be displayed on the wearable for all lights concurrently so to illustrate a path to the equipment in need of maintenance, as one example. 
     Next, the method  10  at block  520  is configured to output a modulated light signal from the light fixture encoding the status data. Details of the transmission of modulated light signal is described below with respect to  FIGS. 1C-4B . 
     Independently or in parallel with the activities occurring on the light fixture and controller thereon, the method  10  at block  530  is configured to monitor, by a sensor on a wearable device, numerous light sources for a signal indicating the availability of status data. For example, tens or hundreds of light sources may be sending their status information, and as the wearable device passes through a facility, it is programmed to detect a handshake signal or data packet, and then receive the information from those devices one at a time. In another example, different frequencies used by the different devices allow for multiple signals to be decoded even when overlapping spatially. 
     In one example, the lights could be synchronized and given specific transmit slots. In another example, the message could be repeated at an interval defined by the serial number and offset from the mains signal, hence ensuring reduced overlapping. In another example, the design of the optical sensor acceptance aperture may be such that it only accepts light from a specific incidence angle, to accomplish spatial discrimination. Further, in another example, a sensor can look at both modulation frequency and intensity to spatially discriminate LED light fixtures. In a further example, the receiver may accept signals beyond a defined intensity threshold. In such a case, the threshold can be tuned such that only signal from the light fixture that is proximity to sensor will be interpreted. 
     Next, the method  10  at block  540  is configured to receive, by a sensor controlled by a second controller on a wearable device, the modulated light signal from the light fixture. Continuing, the method  10  at block  550  is configured to decode, by the second controller of the wearable device, the modulated light signal, into the status data of the equipment. Details of the receipt and decoding of modulated light signal is described below with respect to  FIGS. 1C-4B . For example, after receiving a data packet, the wearable device can locally process the data packet, or can send the data packet to a handheld device such as a tablet held by the same technician, or can send the data packet to a centralized server using a standard wireless networking protocol in the radio frequency. In another example, the wearable may transmit directly to another technician utilizing another wearable. The ability for the wearables themselves to communicate data, or form a network, would have particular advantage as most maintenance events in these types of facilities have a 2 person minimum. Thus, a team of technicians could work together because the communication between wearables and the light fixtures would ensure that everyone on the task has the benefit from any relevant information. 
     Once the status data has been decoded, the method  10  at block  560  is configured to process, on the second controller of the wearable device, the status data to diagnose the equipment. For example, the status data may indicating the need for replacing equipment, environmental conditions out of specification, such as humidity or temperature, or any other condition that requires intervention and diagnosis. Other examples include surge conditions on the power lines, excessive on time or any parameter defined that can impact reliability, and also be conditions indirectly related to equipment as well. For example to monitor circuit protection devices and motor starters, the system may detect significant changes in load, even if not an overload condition, that may be an indication of a problem with a motor or pump, operating outside its normal range. 
     Advantageously, an additional embodiment of the present technology is for light fixture commissioning. For example, commissioning has importance for connected lighting because of the complexity. In one use case, after installation in a facility, and power up, a light fixture can transmit information with respect to its MAC ID, Configuration settings, software version, hardware version, manufacturing date, sensor information, etc. Continuing with this use case, this information is decoded and transmitted to a commissioning application (e.g., running on the network manager device), along with location data. Commissioning application then use this information to identify and digitally tag the fixture in an already uploaded facility map/layout. If facility map/layout doesn&#39;t exist then information is used to create it. User can use this data to create location based configuration settings for fixtures and installation documentation. This example use case can be integrated with the network manager application. 
     In another embodiment,  FIG. 1B  is a flowchart depicting an exemplary method  12  for monitoring or diagnosing equipment. For instance, the method  12  at block  610  is configured to receive, at a centralized server, diagnostic information from a light fixture related to equipment connected to the light fixture, the information including a general location. In one example, the light fixture sends a message using conventional radio wireless network technology to the centralized sever indicating an issue or condition. However, because of the numerous devices in a facility, such information may be wholly inadequate to direct a technician to find the light fixture in question. To accomplish this, the method  12  at block  620  is configured to enable the positioning of a wearable device near the general location indicated by the diagnostic information received by the centralized server. The positioning could be through the deployment of personnel wearing a wearable device. 
     Next, certain security applications of the present disclosure are set forth. One of the main advantageous of using proximity-based data delivery platforms (NFC, VLC, etc.) is security and privacy. In some cases, due to inherent nature of some data user may not want to transmit those data using a wired/wireless platform, that is vulnerable to intrusions. In embodiments in which a lighting system is coupled to critical infrastructure within the facility (e.g., power control equipment, security systems, production measurement systems), sensitive data related to such systems may only transmitted using the lighting system to wearable when it is within the vicinity of the product. This will minimize possibility of unauthorized access to data. Also this ensures technicians can gain access to the sensitive data without opening up the enclosure, thus exposing them to hazardous conditions. 
     In another embodiment, as long as the wearable is proximate to any light fixture in the system, that light fixture may communicate the direction/path to the equipment in need of attention, in order to direct the technician. For example, all of the light fixtures in concert could be used to illustrate the path to the equipment in question (similar to how runway lights change for an approaching aircraft). 
     Next, the method  12  at block  630  is configured to monitor, by a sensor on the wearable device, numerous light sources in order to locate the light fixture in question. For instance, the sensor may be aimed in a general direction of numerous light sources, and may receive communications from one or more devices. Some devices may indicate that the status is okay, and may be disregarded thereafter, as the wearable is used to find the device that requires advanced or further diagnosis. 
     In another example, each signal could use a number of modulation schemes such as time division multiplexing (TDM) and frequency division multiplexing (FDM) to differentiate between the signals. 
     In a further example, wavelength-based discrimination may be used. For instance, as also discussed above, various schemes including sensor optics design approach to discriminate between signals could be used. 
     After locating the specific light fixture in question, the method  12  at block  640  is configured to receive, by the sensor on the wearable device, a modulated light signal from the light fixture. This signal is then, by the method  12  at block  650 , decoded, by the second controller of the wearable device into detailed diagnostic data of the light fixture. The detailed diagnostic data can then be used by to correct the specific issue. Note, that, in different embodiments, the method  12  at block  660  is configured to process, on the wearable device itself, or by communicating to the centralized server, the detailed diagnosis data to diagnose the equipment and determine a corrective action. Thereafter, the method  12  at block  670  is configured to indicate, on a user interface associated with the wearable device, the diagnostic action related to the equipment so that such diagnostic action may be taken. 
     In another embodiment, the action, once completed, may be automatically verified by the wearable and communicated to the central server or back to the light fixture that the action has been completed. For example, if a piece of equipment is overheating due to an accumulation of dust in a grain mill or coker application, the wearable may recognize that the technician has removed the dust by performing a before/after comparison and logging that maintenance action has occurred. As another example, the wearable can take an image of the product and store it for record keeping. 
     Generally stated, disclosed herein, in one embodiment, is a device for monitoring equipment associated with a light source. The device includes a light detection sensor, a user interface device, and a controller operably coupled to the light detection sensor and the user interface device. The controller monitors a plurality of light sources for an availability status indication. The plurality of light sources includes the light source. The controller determines, from the status data availability indication, that status data of the equipment is available from the light source. The controller receives a modulated light signal from the light source. The controller decodes the modulated light signal into decoded status data. The controller determines a status of the equipment based on the decoded status data. The controller processes the decoded status data to determine a diagnosis of the equipment. The controller indicates via the user interface device the diagnosis of the equipment and a diagnostic action related thereto. In one example, the device is wearable by a user. In another example, equipment associated with the light source is a light fixture comprising the light source. In a further example, the equipment associated with the light source is a networking device and the light source is an indicator light on the network device. In one implementation, the user interface device is a display, and the controller indicating via the user interface device comprises displaying the diagnosis and the diagnostic action via the display. In another implementation, the user interface device comprises an audio device, and the controller indicating via the user interface device comprises auditorily playing the diagnosis and the diagnostic action via the audio device. In a further implementation, the controller is further configured to determine that second status data is available from a second light source and receive a second modulated light signal from the second light source. With respect to the examples above, the modulated signal output by the light source cannot be perceived by a human eye. In another example, one or more of the controller determining the status and processing the decoded status data comprises the device sending the decoded status data to a centralized server, and receiving instructions from the centralized server. In another example, the controller is further configured to communicate with the equipment via a wireless networking protocol to request the equipment to begin communicating via the light source to facilitate determining a specific location of the equipment. 
     In another embodiment, disclosed herein is a wearable device for monitoring equipment a light fixture is presented. The wearable device includes a light detection sensor, a display comprising a graphical user interface, and a controller operably coupled to the light detection sensor and the display. The controller receives a modulated light signal from the light source. The controller decodes the modulated light signal into decoded status data. The controller determines a status of the equipment based on the decoded status data. The controller processes the decoded status data to determine a diagnosis of the equipment. The controller displays via the graphical user interface device the diagnosis of the equipment and a diagnostic action related thereto. 
     In a further embodiment, a light fixture is presented. The light fixture includes a light source and a controller operably coupled to the light source, The controller is configured to receive status data from equipment, encode the status data in a modulated light signal, and output the modulated light signal using the light source. 
     Turning next to  FIGS. 1C-4B , disclosed are a system, a method and an apparatus for artificial light source based messaging. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the various embodiments. 
     It will be appreciated that the various embodiments discussed herein need not necessarily belong to the same group of example embodiments, and may be grouped into various other embodiments not explicitly disclosed herein. In addition, it will be appreciated that the various operations, processes, and methods disclosed herein may be embodied in a machine-readable medium and/or a machine accessible medium compatible with a data processing system (e.g., a computer system), and may be performed in any order (e.g., including using means for achieving the various operations). Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense. Before discussing the embodiments directed to the method, system, and apparatus for artificial light source based messaging, it may assist the reader to understand the various terms used herein by way of a general description of the terms in the following paragraphs. 
     The term ‘device’ as described herein may generally include any appropriate digital device, electronic device, analog device, electrical device, networking device, security device, home appliance, and or other appropriate device. Listing a few examples of the device, without being exhaustive, the device may be a light control panel, light fixtures, electrical lamps, a switchboard, a thermostat, a telephone, an electric/AC (alternating current) receptacle, an electronic lock, a keypad, a modem, a server, an appliance, etc. In another example, the device may include mechanical devices that are adapted to include artificial light sources. 
     The term ‘artificial light source’ as described herein may generally refer to any appropriate man-made source of light. For example, an artificial light source may include, inter alia, electric lamps, incandescent lamps, light emitting diodes, gas discharge lamps, and high intensity discharge lamps. In the following description, even though a light emitting diode may be used as an example representation of the artificial light source, one of ordinary skill in the art can understand and appreciate that the light emitting diode may be replaced by other appropriate artificial light sources without departing from the broader scope of this description. 
     The term ‘data associated with the device’ as described herein may generally refer to any appropriate information associated with a device. The data associated with the device may include, inter alia, a digital address of the device, an electric, electronic, and/or mechanical setting of the device, a list of components that form the device, settings associated with the components of the device, maintenance and service information associated with the device, configuration of the device, a status of the device, or any appropriate operational information associated with the device, etc. The artificial light source may be configured to emit modulated light based on the data associated with the device. 
     The ‘light sensor device’ as described herein may generally refer to any appropriate digital device adapted to detect light or adapted to include a sensor that is capable of detecting light. For example, the light sensing device may include a mobile computing device such as a smart phone or a hand held device embedded with a light sensor. In another example, the light sensing device may include a wearable computing device or a body-borne computing device, such as Google glass which is a wearable computing device with a head mounted optical display. In another example, the light sensing device as a wearable computing device could be a watch with a digital display and adapted to detect the modulated light. In one embodiment, the light sensing device may include a display interface to visually display data to a user. In another embodiment, the light sensing device may be configured to transmit the data to an external display device. In yet another embodiment, the light sensing device may be configured to communicate data to the user through other means, such as auditory, tactile, and/or olfactory. 
     An artificial light source based messaging platform may include a light based message transceiver unit (herein ‘transceiver unit’). The transceiver unit may be adapted to be attached to or embedded in any appropriate device. The transceiver unit may include an artificial light source, wherein the artificial light source is adapted such that light emitted by the artificial light source may be modulated at a frequency that is imperceptible to the human eye, but detectable by a light sensor device. In other words, the light emitted from the artificial light source may flicker, but the rate (frequency) at which the light flickers may be imperceptible to the human eye, but detectable by a light sensor device. The modulated light may be generated by controlling the artificial light source. Further, the modulated light generated from the artificial light source may be representative of any appropriate data associated with the device to which the transceiver unit is attached to or within which the transceiver unit is embedded. 
     The modulation of the artificial light may be based on data that is to be conveyed. For example, if the data to be conveyed is 010 in binary, then the artificial light source may be controlled to initially emit light at a first frequency representative of the first 0, followed by emitting light at a second frequency representative of a 1, which is further followed by emitting light at the first frequency representative of the last 0. 
     As described above, the modulated light may be detectable by a light sensor device. The light sensor device may include a light sensor, such as a photo diode that is adapted to detect the modulated light from the artificial light source. In one example, the light sensor device may be adapted to specifically detect the modulated light and distinguish between the modulated light, light that is not modulated, flickering light from a light source due to an error in the light source circuitry, and/or light from natural light sources. In the following description, even though a photo diode is used as an example light sensor for detecting the modulated light, one of ordinary skill in the art can understand and appreciate that the photo diode may be replaced by any other appropriate light sensors without departing from the broader scope of this description. 
     Upon detecting the modulated light from the artificial light source, the light sensor device may demodulate the modulated light and decode the data associated with the device that is transmitted through the modulated light. Further, the light sensor device may be configured to display the data associated with the device to a user over the display interface of the light sensor device. In one embodiment, when the data associated with the device is a digital address of the device, the light sensor device may be configured to transmit the data to a centralized database or a centralized system over a wired and/or wireless network to retrieve additional data associated with the device which may be customized to the user. 
     Once the data associated with the device is displayed to a user, the user may decide to change the settings of a device. The user may input the changes via a graphical user interface (GUI) associated with the light sensor device, such as a smart phone, smart watch, wearable computing devices, etc. The inputted changes, i.e., the new setting values may be transmitted to the transceiver unit coupled to the device. 
     The transceiver unit may include a communication circuit that is configured to receive data transmitted from the light sensor device over a wireless or wired communication link. The wireless communication link can include, inter alia, a Wi-Fi link, a WiMax link, a cellular link, Zigbee link, Bluetooth link, or any other appropriate wireless link. Further, the communication circuit may be configured to transfer the received data to a processor that is configured to change the settings of the device based on the new setting values received from the light sensor device. 
     Technology for artificial light source based messaging will now be described in greater detail with reference to  FIGS. 1A-4B  which describe representative embodiments of the present invention. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the various embodiments.  FIG. 1C  describes an operational environment of an artificial light source based messaging platform.  FIG. 2  describes the light based message transmitter in greater detail.  FIGS. 3-4B  will be described by making references back to  FIGS. 1A-2 . Specifically  FIGS. 3, 4A and 4B  describe the different operations of the artificial light source based messaging platform using suitable illustrations and flowcharts. 
     As described above, the present invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those having ordinary skill in the art. Furthermore, all “examples” or “example embodiments” given herein are intended to be non-limiting and among others supported by representations of the present invention. 
     Now turning to  FIG. 1C ,  FIG. 1C  illustrates an example operational environment of the artificial light source based messaging platform, according to certain example embodiments of the present disclosure. In particular,  FIG. 1C  illustrates one or more devices  108   a - e , light based message transceivers  102 , a light sensor device  104 , modulated light  106 , a wireless response  114 , and a user associated with the light sensor device  110 . The following description may refer to a device  108 , which may be representative of one or more devices  108   a - e.    
     In one embodiment, a device  108  may include a transceiver unit  102 . In one embodiment, the transceiver unit  102  may be built into the device. In another embodiment, the transceiver unit  102  may be attachable to the device  108 . Further, in one embodiment, the transceiver unit  102  may be associated with one device  108 . In another embodiment, the transceiver unit  102  may be associated with more than one of the devices  108   a - e , i.e., one transceiver unit  102  may represent a group of devices. 
     The transceiver unit  102  may be configured to transmit data associated with the device by modulating light emitted from an artificial light source. In other words, the modulated light  106  may be representative of data associated with the device  108 . In one embodiment, the data associated with the device may include device settings data (herein ‘settings data’) associated with the device  108 . The settings data associated with the device  108  can include, inter alia, the mechanical settings, electrical settings, power settings, temperature settings, meter readings, and/or any appropriate settings. In another example, the settings could also be network information such as MAC IDs for the light fixtures used in commissioning the lighting system. The wearable can be used to create the facility map of the lighting system and other systems at time of commissioning. 
     For example, for an electric lamp device, the settings can include, inter alia, the circuit number associated with the lighting fixture adapted to hold the electric lamp, the voltage reading on the electric lamp, the power reading in watts associated with the electric lamp, light intensity of the light emitted by the electric lamp, service information including the date at which the lighting fixture was serviced, and/or date when the electric lamp was fitted. In another example, for a thermostat device, the settings reading can include, inter alia, a current temperature reading associated with a heating/cooling device, a pre-set minimum and maximum temperature, last date on which the thermostat and/or associated heating/cooling device was serviced, power reading associated with the thermostat, the name of the service technician that serviced the thermostat, components of the thermostat and/or the associated heating/cooling device that may need to be replaced in the near future, model number of the thermostat, and/or an estimated date of the next required servicing. 
     In yet another example, for an electric lamp device within a large lighting system, the settings data can include, inter alia, a device identifier such as a circuit number and/or a panel number, a group identifier associated with a group of electric lamps to which the electric lamp of interest is associated. In another example, for an electric receptacle device, the settings data can include, inter alia, a voltage and current rating associated with the electric receptacle, and/or information indicating if each socket and/or contact in the socket is energized. In a further example, for a coffee maker device, the settings data can include, inter alia, a temperature reading of the coffee, a voltage, current, and/or power reading associated with the coffee maker, and/or a brew time. In another example, for an electronic lock device, the settings data can include information regarding the state of the lock, a maker of the lock, a model of the lock, an access granted information, an access denied information, and/or an access code associated with the lock. 
     In another embodiment, the data associated with the device  108  can include device identifier data (herein ‘digital address’) of the device  108  which can be used to obtain additional data, such as settings data associated with the device  108  as will be described below in greater detail. One of ordinary skill in the art can understand and appreciate that a digital address is an example representation of the device identifier data, and the digital address can be replaced by any other appropriate data that identifies a device  108  without departing from the broader scope of the description. In another embodiment, the data associated with the device  108  can include both the settings data and the digital address or just settings data. In an example embodiment, the transceiver unit  102  may choose between the settings data and the digital address based on the size of data, power constraints, and/or other additional factors that affect the speed of transmission, the power associated with the transceiver unit, etc. For example, if the size of settings data associated with a device is below a data size threshold such as 1 MB, then the transceiver unit may choose to transmit the settings data. On the other hand, if the size of the setting data is greater than 1 MB, then the transceiver unit may choose to transmit the digital address which can then be used to obtain additional data associated with the device. In another example, if the transceiver unit is configured to conserve power, then the transceiver unit may decide to transmit the digital address of the device for each transmission instead of transmitting large amounts of data through light modulation. 
     The modulated light  106  representative of data associated with the device  108  may be detected by the light sensor device  104 . The light sensor device  104  may be coupled to a centralized system through a private network or a public network, such as a VPN or the Internet over a wired and/or wireless communication link. In one embodiment, the light sensor device  104  may be adapted to include a sensor capable of detecting the modulated light  106 , such as a photo diode. Upon detecting the modulated light  106 , the light sensor device  104  may be configured to demodulate and decode the modulated light  106  to extract the data transmitted via the modulated light  106 . Further, the light sensor data  104  may determine if the data is settings data, a digital address, and/or any other appropriate data associated with the device. 
     If the extracted data is settings data, then the light sensor device  104  may be configured to display the data to a user  110  associated with the light sensor device  104 . In one embodiment, the data may be displayed through a display interface associated with the light sensor device  104 . In another embodiment, the light sensor device  104  may communicate the data to a user  110  over an external or remote display unit. In yet another embodiment, the light sensor device  104  may communicate the data to a user  110  via other communication means, such as auditory, tactile, etc. 
     If the extracted data is a digital address associated with the device  108 , the light sensor device  104  may be configured to communicate the digital address to a centralized database, and/or a cloud server (herein ‘a centralized system’) via a wired and/or wireless link. Further, in addition to the digital address, the light sensor device  104  may transmit a user profile or a user identifier associated with a user  110  to the centralized system. Upon receiving the digital address and/or the user profile, the centralized system may retrieve additional data associated with the device  108 , for example settings data. Further, based on the user profile, the centralized system may filter the additional data and customize the additional data based on requirements and privileges allotted to a user  110 . Then, the centralized server may transmit the additional data to the light sensor device  104  via a wired and/or wireless communication link. Further, the light sensor device  104  may communicate the received additional data, such as the settings data with a user  110  via one or more presentation means, such as visual, auditory, and/or tactile means. 
     Upon communicating the data associated with a device  108  to the user, the user may decide to change the data or input new settings data to change the settings of the device  108 . In one embodiment, new settings data or any other appropriate light control related data may be input to the light sensor device  104  through an input interface embedded in or associated with the light sensor device  104 . For example, data may be input through a touchscreen module of the light sensor device or through a keypad of the light sensor device. In another example, the input interface can be an audio interface or a gesture recognition interface. That is a user can provide voice commands as input or perform a gesture that is captured and decoded as an input. In yet another example, a remote input device may be coupled to the light sensor device and a user may access the remote input device to provide input such as new settings data to the light sensor device  104 . The light sensor device  104  may receive the new settings data and communicate the new settings data to the transceiver unit  102  over a wired and/or wireless link. When data is transmitted from the light sensor device  104  to the transceiver unit  102  over a wireless link, the data may be referred to as a ‘wireless response’  114 . 
     In one embodiment, the data transmitted by the light sensor device  104  may be received by the transceiver unit  102 . Further, based on the received data, the transceiver unit  102  may change the settings of the device  108 . In another embodiment, the received data may be transmitted to a processor of the device  108  that is external to the transceiver unit  102 , which in turn may change the settings of the device  108 . Once the settings have been changed, the transceiver unit  102  may further control the artificial light source to emit modulated light representative of the new settings which may be detected, decoded, and displayed by the light sensor device  104 . 
     Turning to  FIG. 2 ,  FIGS. 2A and 2B  (collectively  FIG. 2 ) illustrate block diagrams of the light based message transceiver unit, according to certain example embodiments of the present disclosure. In particular,  FIG. 2  illustrates an artificial light source  202 , a processor and modulator unit  204 , a communication circuit  208 , and a memory  206 . 
     As illustrated in  FIG. 2A , the transceiver unit  102  can include processor and modulator unit  204 . In one embodiment, the processor can be a multi-core processor. In another embodiment, the processor can be a combination of multiple single core processors. In one embodiment, the transceiver unit  102  can include a memory  206  coupled to the processor and modulator unit  204 . The memory  206  can be a non-transitory storage medium, in one embodiment. In another embodiment, the memory  206  can be a transitory storage medium. The memory  206  can include instructions associated with the operation of the transceiver unit, which may be executed by the processor to perform operations of the transceiver unit  102 . In other words, operations associated with modulation of the light emitted from the artificial light source  202  and communications to and from the transceiver unit  102  can be executed using the processor. 
     In another embodiment, the processor and memory may be external to the transceiver unit  102 . The processor may be part of the device  108  that is associated with the transceiver unit  102 . In said embodiment, the transceiver unit  102  may include a modulator and a communication circuit  208  that is configured to receive instructions from the external processor, wherein the instructions may control operations of the modulator which in turn may control the artificial light source  202  to modulate an emitted light. 
     In yet another embodiment as illustrated in  FIG. 2B , the transceiver unit  102  may not include a communication circuit  208 . In said embodiment, the memory  206  of the transceiver unit  102  may be configured to store instructions and other appropriate information to operate the transceiver unit  102  as a self-contained unit. For example, the memory may include the digital address of the device  108  associated with the transceiver unit  102 . Further, the memory may include settings data for a number of different settings associated with the device  108 . 
     In one embodiment, the transceiver unit  102  may be self-powered using batteries. In another embodiment, the transceiver unit  102  may be coupled to a power supply source that provides power to the device  108  associated with the transceiver unit  102 . 
     In some embodiments, the transceiver unit  102  may be limited to the processor and modulator unit  204  and a memory  206 . In said embodiment, the artificial light source may be a part of the device  108 . For example, the artificial light source may be one or more LEDs embedded in the device  108  that may be used for a power or status indication of the device. In said example, the LED may be coupled to the transceiver unit  102  and may be adapted to receive signals from the transceiver unit  102  for emitting a modulated light  106 . 
     In an example embodiment, in addition to emitting the modulated light representative of data associated with a device  108 , the artificial light source  202  may be used for other operations such as illumination of a surrounding space. In another example, instead of using an artificial light source  202  associated with the transceiver unit  102 , an electric lamp associated with the lighting fixture  108   a  may be used both for illumination and data transmission by modulating light from the electric lamp. In another example embodiment, the artificial light source  202  may be used specifically for transmitting data associated with the device via emitting modulated light. 
     In one embodiment, the light from the artificial light source may be modulated by controlling the electric signals inputted to the artificial light source that drive the artificial light source. In another embodiment, the light from the artificial light source may be modulated by switching the artificial light source on and off at a desired frequency. In yet another embodiment, the light from the artificial light source may be modulated by changing the intensity of light emitted from the artificial light source at a desired frequency. In other words, modulating an artificial light source may refer to modulating the light from the artificial light source by adjusting, inter alia, a frequency, a wavelength, and/or an intensity of the light from the artificial light source. In some embodiments, the modulation may be perceptible to the human eye. In other embodiments, the modulation may be imperceptible to the human eye. 
     In one embodiment, as illustrated in  FIG. 2A , the communication circuit  102  may be configured to receive data of a device  108  (e.g., settings data or digital address) associated with the transceiver unit  102 . Each time the settings of the device  108  are changed, the communication circuit  208  may receive the updated settings data. In an example embodiment, the settings data may be stored in the memory  206 . Further, the digital address of the device may be stored in the memory  206 . Depending on the size of the memory  206 , the older settings data may be transferred to a larger external memory such as memory associated with the device  108  for future reference and the latest settings data may be stored in the memory  206 . In some embodiments, the older settings data may be transmitted to a cloud server via the communication circuit  208  to be stored in the cloud server for future use. In another embodiment, if the memory  206  has a large data store capacity, then both the older settings data and the updated settings data may be stored in the memory  206 . 
     Further, the communication circuit  208  may be configured to receive external trigger signals that trigger the processor to initiate the modulation of the light emitted by the artificial light source  202 . In one embodiment, the external trigger signal may be received from the light sensor device  104  based on a corresponding action of a user  110 . For example, the user  110  may press a button on the light sensor device  104  requesting the device  108  to provide its setting data or digital address. In another embodiment, the external trigger signal may be received from the device  108  associated with the transceiver unit  102 . For example, the device  108  may instruct the transceiver unit  102  to broadcast data associated with the device  108 . In yet another embodiment, the external trigger signal may be received from the device corresponding to an action of the user  110 . For example, the user  110  may switch on the device  108 , which automatically sends a trigger signal to the transceiver unit  102 . 
     Furthermore, the communication circuit  208  may be configured to receive user input data from the light sensor device  104  preferably over a wireless link. The user input data may include new settings data to change the settings of the device  108 . 
     In one embodiment, the transceiver unit  102  may be configured to broadcast data associated with the device  108  at regular intervals via the modulated light  106  from the artificial light source  202  even without any external trigger signals. In another embodiment, the transceiver unit  102  may be configured to broadcast data associated with the device  108  at intervals that are settable by a user. 
     In either case, upon receiving the trigger signal, the processor and the modulator unit  204  may operate to modulate the light emitted by the artificial light source  202  based on the data associated with the device  108 . The operation of the transceiver unit  102  may be described below in greater detail, in association with  FIG. 3 . 
     Although specific operations are disclosed in the flowcharts illustrated in  FIG. 3 , such operations are examples only. That is, embodiments of the present invention are well suited to performing various other operations or variations of the operations recited in the flowcharts. It is appreciated that the operations in the flowcharts illustrated in  FIG. 3  may be performed in an order different than presented, and that not all of the operations in the flowcharts may be performed. 
     All, or a portion of, the embodiments described by the flowcharts illustrated in  FIG. 3  can be implemented using computer-readable and computer-executable instructions which reside, for example, in computer-usable media of a computer system or like device. As described above, certain processes and operations of the present invention are realized, in one embodiment, as a series of instructions (e.g., software programs) that reside within computer readable memory of a computer system and are executed by the processor of the computer system. When executed, the instructions cause the computer system to implement the functionality of the present invention as described below. 
     Turning to  FIG. 3 , this figure illustrates process flow diagrams of one or more methods of communicating data associated with a device using the artificial light source based messaging platform, according to certain example embodiments of the present disclosure. 
     The process begins at operation  302  and proceeds to operation  304 . In operation  304 , the transceiver unit  102  associated with the device  108  may modulate the light emitting from an artificial light source  202  associated with the transceiver unit  102 . The artificial light source  202  may be modulated based on the data associated with the device  108  that is to be communicated to a user  110 . Further, the artificial light source  202  may emit a modulated light  106  which may be detected by a light sensor device  104  in operation  306 . 
     Upon detecting the modulated light, in operation  308 , the light sensor device  104  may be configured to demodulate and decode the modulated light to retrieve data associated with the device  108 . Further, in operation  310 , the light sensor device  104  may display the decoded data associated with the device  108  to a user  110  over a display interface. In some embodiments, the decoded data associated with the device  108  may include instructions to communicate at least a portion of the data with a centralized system to retrieve additional data associated with the device. As described above in association with  FIG. 1C , the light sensor device  104  may communicate with the centralized system over a wired or wireless network. In one embodiment, the communication between the light sensor device  104  and the centralized system may be secure and encrypted. 
     In addition to a portion of the data, the light sensor device  104  may communicate a location of the light sensor device  104  which is in a visible range of the device  108  and the transceiver unit  102 . The location may be obtained based on a location estimation unit, such as a GPS unit associated with the light sensor device  104 . In some embodiments, based on the location of the light sensor device  104 , the centralized system may determine the device  108  for which the additional data is being requested. Further, the additional data may be transmitted to the light sensor device  104 , which in turn may display the additional data to the user  110  via a display interface associated with the light sensor device  104 . 
     Upon displaying the data associated with the device to the user, in operation  312 , the user may express interest to change the present settings of the device  108  by inputting new parameter values for one or more device settings. In an example embodiment, the user may input the new parameter values (e.g., via a graphical user interface) to the light sensor device, such as a smart phone. Further, in operation  314 , the new parameter values may be transmitted to the transceiver unit  102  preferably over a wireless link. In operation  316 , the communication circuit  208  of the transceiver unit  102  may receive the new parameter values for the device settings and in response, in operation  318  change the settings associated with the device  108 . Alternatively, the transceiver unit  102  may send the received new parameter values to a processor associated with the device  108  which may realize a change in settings of the device  108 . In yet another embodiment, the light sensor device  104  may communicate the new parameter values back to the centralized system that may be in communication with a control system associated with the device  108  to induce a change in the settings based on the new parameter values. 
     In an example embodiment, the light sensor device  104  may be a wearable computing device, for example a head mounted optical display. The head mounted display may be adapted to visually display data to a user in a field of vision of the user. Further, in said example embodiment, the head mounted optical display may include a photo diode adapted to detect modulated light  106  from a transceiver unit  102 . In the example embodiment, when the user donning the head mounted optical display unit looks at a light fixture  108   b  or when the head mounted display is in a line of sight of the light fixture  108   b , the head mounted optical display unit may detect a modulated light  106  from a transceiver unit  102  associated with the light fixture  108   b . Nearly simultaneously, the head mounted optical display unit may display settings data associated with the light fixture  108   b . For example, the head mounted optical display may display a circuit identifier, a panel number, a voltage and current reading on the light fixture, a light intensity of the light fixture  108   b  if the electric lamp associated with the light fixture  108   b  is switched on, an operational status of the light fixture  108   b , or a model of the light fixture  108   b . Further, one or more light fixtures associated with light fixture  108   b , or a group of light fixtures that are associated with each other may appear as color coded, wherein the color of the group of lights associated with each other may be different from the color associated with light fixtures that are not part of the group. This helps in easy identification of a group of devices associated with each other by visual means. Further, this helps in easy reading of device settings by just looking at the device using a wearable computing device such as a head mounted optical display unit. In another example, the wearable computing unit may be pointed at the device and the unit may pick up modulated light from the corresponding transceiver unit  102  and display data associated with the device on the wearable computing unit. Upon receiving the settings data such as light intensity associated with the light fixture  108   b , a user may desire to reduce the light intensity or dim the light fixture  108   b . The wearable computing device may either have a graphical display unit configured to display and/or receive control inputs (e.g., touchscreen) from the user or the wearable computing device may be communicatively coupled to a smart phone that has a graphical display unit configured to display and/or receive control inputs (e.g., touchscreen) from the user. The user may use the graphical display unit to input new settings, i.e., reduce the light intensity which may be communicated back to transceiver unit  102  via a wireless communication method, and the communication circuit  208  of the transceiver unit  102  may receive the new parameters and effect the necessary changes to the light intensity of the light fixture  108   b.    
     The communication circuit  208  of the transceiver unit  102  may be a communications receiver unit. In some embodiments, operations  312  to  318  can be omitted, in which case the transceiver unit  102  can be replaced with a transmitter unit  102  capable of modulating the light associated with the artificial light source  202  and absent the receiving capabilities for receiving data from the light sensor device  104 . 
     Turning to  FIGS. 4A and 4B , the process flow begins with operation  450  and proceeds to operation  452 . In operation  452 , the transceiver unit  102  associated with the device  108  may modulate the light emitting from an artificial light source  202  coupled to the transceiver unit  102 . The artificial light source  202  may be modulated based on the data associated with the device  108  that is to be communicated to a user  110 . The data may include a digital address of the device  108 . Further, the artificial light source  202  may emit a modulated light  106  which may be detected by a light sensor device  104  in operation  454 . 
     Upon detecting the modulated light, in operation  456 , the light sensor device  104  may be configured to demodulate and decode the modulated light to retrieve the digital address associated with the device  108 . In some embodiments, the light sensor device  104  may be configured to determine whether the data is settings data, a digital address, a combination of both, or another appropriate data. If the data includes settings data, the light sensor device  104  may be configured to display the settings data to a user  110  via a display interface of the light sensor device  104  as described above in association with  FIG. 3 . If the data is a digital address, then in operation  458  the light sensor device  104  may be configured to transmit the digital address to a centralized system  112 . In addition to the digital address, the light sensor device  104  may transmit a user identifier to the centralized system. The user identifier may reference a user  110 , and further identify the user&#39;s profile, user&#39;s preference, and other user information stored in the centralized system. 
     In operation  460 , the centralized system may receive the digital address and/or the user identifier. Upon receiving the digital address and/or user identifier, in operation  462 , the centralized system may retrieve settings data and/or other additional data associated with the device  108 . Further, based on the user identifier, the centralized system may filter and customize the settings data and/or additional data before transmitting data to the light sensor device  104  for display. In other words, the data may be customized based on the type of user and the privileges available to the user. For example, in the case of a light fixture, an end user may receive settings information such as voltage and current readings, and the intensity of the light associated with an electric lamp of the light fixture. However, the model and manufacture number, and last date on which the light fixture was serviced may be masked from the end user. For a technician, none of the data may be masked. The technician may be provided with all the available data. In another example, for an electronic lock unit, based on the end user, if the end user is authenticated, an access code may be transmitted to the light sensor device which in turn may be communicated to the end user for unlocking the electronic lock unit. On the other hand, a technician may be provided the lock model, the internal components of the lock, and other additional data needed to service or fix the electronic lock unit. 
     Once the settings data and/or additional data is filtered and customized, in operation  464 , the customized data may be transmitted to the light sensor device. In operation  466 , the light sensor device  104  receives the customized data and displays the customized data to a user  110  via a display interface in operation  468 . Once the data is displayed to the user  110 , operations  470 - 476  may be executed. Operations  470 - 476  may be similar to operations  312 - 318  of  FIG. 3  and may not be repeated again. In some embodiments, the process may end with operation  468 , and operation  470 - 476  may be omitted without departing from a broader scope of this disclosure. 
     In one example embodiment, user John Doe may don a head mounted optical display which may include a photo diode capable of detecting a modulated light from an artificial light source  202 . The head mounted optical display including the photo diode may be a light sensor device. Further, John Doe may have a smart phone that is adapted to sense a modulated light from an artificial light source  202 . John Doe may be a technician assigned to fix a light fixture  108   a  in a room that is locked using an electronic lock  108   c  that keeps the room locked. The electronic lock  108   c  may have an LED or artificial light source coupled to the electronic lock  108   c  or embedded in the electronic lock  108   c . Both the light fixture  108   a  and the electronic lock  108   c  may be adapted to include the transceiver unit  102 . 
     John Doe may walk up to the room and look at the electronic lock  108   c . In one embodiment, the transceiver unit  102  of the electronic lock  108   c  may be automatically broadcasting a device identifier associated with the electronic lock  108   c . In another embodiment, the electronic lock  108   c  may be fitted with a button which when pushed initiates a transmission of the device identifier  102 . The transceiver unit  102  may transmit or broadcast the device identifier through modulated light from an artificial light source. The device identifier data may be embedded in the modulated light. In other words, the light from an artificial light source  202  associated with the transceiver unit  102  and coupled to or embedded in the electronic lock  108   c  may be modulated based on the device identifier data. 
     If the transceiver unit  102  is emitting modulated light representative of the device identifier, the head mounted optical display  104  and/or the smart phone  104  that is in a line of light of the transceiver unit  102  may detect the modulated light. Further, the head mounted display and/or the smart phone may demodulate and decode the modulated light to extract the device identifier associated with the electronic lock  108   c . Further, either of the light sensor device  104 , i.e., the head mounted display and/or the smart phone may add John Doe&#39;s user identifier to the device identifier and transmit both the identifiers to a centralized system  112 . The centralized system  112  may authenticate John Doe and retrieve an access code associated with the electronic lock. Further, the access code may be transmitted back to either of the light sensor devices. If the access code is transmitted to a head mounted display, the access code may be visually presented to the user through the head mounted display. Alternately or in addition, the access code may be visually presented on the smart phone. Further, John Doe may use the access code to unlock the door and enter the room. 
     Once John Doe enters the room, John Doe may switch off the smart phone. The room may have three light fixtures of which one is light fixture  108   a . John Doe may look at a first light fixture in the room through the head mounted optical display. The first light fixture that John Doe looks at may not include a transceiver unit and therefore no information may be displayed on the head mounted display. In other examples, John Doe does not need to look at the light fixture. For example, John Doe may be looking at his notebook or tablet through the wearable glasses and so long as the optical sensor on the wearable can see the light transmission from the communicating light in its field of view (including the floor, walls, etc.) then it can receive the communication. Then John Doe looks at a second light fixture in the room which is coupled to a transceiver unit  102 . The head mounted display may detect modulated light from the second light fixture which may be demodulated, and decoded to extract data associated with the second light fixture. Further, the data associated with the second light fixture may be displayed to John Doe through the head mounted display. Based on the displayed data, John Doe may determine that the second light fixture is light fixture Y which may not of interest to John Doe. The data associated with the second light fixture may not be filtered or customized to John Doe&#39;s requirement. 
     John Doe proceeds to look at the third light fixture that is coupled to a corresponding transceiver unit  102 . Data associated with the third light fixture may be received in the form of modulated light from the transceiver unit  102  associated with the third light fixture. The data may include a device identifier of the third light fixture. Further, the head mounted display may transmit either directly or through other communication means the device identifier along with John Doe&#39;s user identifier to the centralized system. The centralized system may retrieve the settings data associated with the third light fixture and filter the settings data based on John Doe&#39;s user identifier. The centralized system may recognize John Doe as an assigned technician and the data may include settings values that may be beneficial for a technician. Further, the filtered and customized data may be transmitted to the head mounted display which in turn may display the data to John Doe. The displayed data may indicate that the third light fixture is light fixture  108   a  and further the data may indicate that the electric lamp associated with the light fixture  108   a  needs to be replaced. 
     In addition the data may indicate that the light fixture is set to emit light at half intensity. After replacing the electric lamp or prior to replacing the electric lamp, John Doe may change the settings of the light fixture to emit light at full intensity by inputting the settings change through the head mounted display. The head mounted display may be configured to read hand gestures and recognize a user input corresponding to hand gestures or voice inputs. The head mounted display may recognize John Doe&#39;s intent to increase the intensity of light emission to full bright. Accordingly, the head mounted display may transmit the user input from John Doe to the transceiver unit  102  over a wireless link, provided the head mounted display has wireless communication capability. Nearly simultaneously, the intensity of light of the replaced electric lamp at the third light fixture may be changed to 100% bright. 
     Once the settings of the light fixture  108   a  are changed, the transceiver unit  102  associated with the light fixture  108   a  may cause the artificial light source  202  of the transceiver unit  102  to modulate light based on the new settings data. Further, the head mounted display may detect the modulated light and display the corresponding new data that indicates the new setting to John Doe. 
     Although the present embodiments have been described with reference to specific example embodiments, it will be evident that various modifications and changes may be made to these embodiments without departing from the broader spirit and scope of the various embodiments. For example, the various devices and modules described herein may be enabled and operated using hardware circuitry (e.g., CMOS based logic circuitry), firmware, software or any combination of hardware, firmware, and software (e.g., embodied in a machine readable medium). For example, the various electrical structures and methods may be embodied using transistors, logic gates, and electrical circuits (e.g., application specific integrated circuitry (ASIC) and/or in Digital Signal Processor (DSP) circuitry). 
     The terms “invention,” “the invention,” “this invention,” and “the present invention,” as used herein, intend to refer broadly to all disclosed subject matter and teaching, and recitations containing these terms should not be misconstrued as limiting the subject matter taught herein or to limit the meaning or scope of the claims. From the description of the example embodiments, equivalents of the elements shown therein will suggest themselves to those skilled in the art, and ways of constructing other embodiments of the present invention will appear to practitioners of the art. Therefore, the scope of the present invention is to be limited only by the claims that follow.