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Author: search.filters.author.Chanthosot, PokpoomSubject: search.filters.subject.Wireless optical data transmission system

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    Item type:Publication,
    Full-duplex star redundant system for visible light communication
    (2017-01-01)
    Tipsuwanporn, Vittaya
    ;
    Chanthosot, Pokpoom
    ;
    Krongratana, Viriya
    ;
    Numsomran, Arjin
    The full-duplex star redundant system of visible light communication (VLC) for indoor utilization was developed by adding an IR transmitter into the slave part and an IR receiver into the master part of the previous system, which had only an LED as the transmitter and a photodiode as the receiver. This development allows the system to be capable to transmit and receive images and audios in addition to mere texts as before. The transmitted data were encoded with the technique of Manchester encoding, and then tested with 3 types of photodiodes namely VBPW24R, FDS10X10, and OSD100-E. The data transmission was backed up with 3 LED modules that were controlled by an Arduino microcontroller in case one of the modules is damaged. Moreover, the system has functionality in notifying users via the status monitor to check when malfunction happens with any module.
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    Item type:Publication,
    The indoor use development for visible light communication
    (2015-01-01)
    Chanthosot, Pokpoom
    ;
    Tipsuwanporn, Vittaya
    ;
    Krongratana, Viriya
    ;
    Lilawatthananun, Thanaporn
    The technology of visible light communication (VLC) for indoor use has LED and photodiode as two main components. Despite many advantages, VLC has a major problem regarding the short distance of effective communication due to limited power of the emitted light from LED. This study aims to improve effectiveness of VLC by increasing its distance of wireless data communication when used indoor. The method was based on using white LED Array. The operational results at different distances were presented by using UART as the connection interface between the transmitter and the receiver. This research was successful in increasing the maximum data transmission distance of VLC to be up to 400cm. The type of photodiode that enabled this success was OSD-IOOE Photodiode.