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    Item type:Publication,
    Star redundant system for visible light communication
    (2016-01-24)
    Tipsuwanporn, Vittaya
    ;
    Chanthosot, Pokpoom
    ;
    Krongratana, Viriya
    ;
    Numsomran, Arjin
    Visible Light Communication (VLC) for indoor use equipped with a Star redundant system, using LED (light emitting diode) light bulbs and photodiodes as data receivers and transmitters, respectively, was developed in this research. The data for the transmission experiment was in a text files format encoded with the Manchester algorithm. White-light LEDs were used. This system was tested with three types of photodiodes namely VBPW24R, FDS10×10, and OSD100-E. The data was backed up with 3 redundant control sets of LED modules. Arduino UNO R3 microcontroller was used in a case that one module is damaged. Via its USB port (Universal Serial Bus port), the system can also be connected to other devices such as smart phones and computers. Moreover, its monitor can display useful information about its operation as well as notifications to inform users about any malfunctions happening to a specific module.
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    Item type:Publication,
    Indoor localization system using visible light communication
    (2015-01-01)
    Cherntanomwong, Panarat
    ;
    Chantharasena, Wisarut
    Visible light communication (VLC) has recently become popular due to its benefit of VLC. VLC can provide not only the data communication via light, but also illumination. Indoor localization using VLC is a solution to locate objects or people inside a building using visible light wave by reading the identification data from visible light tubes. However, the identification data cannot be read in the light overlapping area. Time division multiplexing (TDM) is used to deal with this issue. In this work, the proximity technique is used for localization. The LED spotlights at fixed locations are used as transmitters that transmit their unique IDs, while the photodiode is used as a target receiver. By using the proximity technique, the location of the target is identified using one received ID or more.