Usage of light emitting diode (LED) is rapidly growing due to its reliability, low
power consumption and high efficiency. In Visible Light Communication (VLC)
system, LED is used for illumination simultaneously its can be used for
communication. The objective of this project is to study the VLC system and design
a prototype to demonstrate the functionality of VLC system for audio and digital
signal transmission through modulated LED light beam. The VLC system consist of
two main components which are transmitter and receiver. The transmitter is attached
with LED and the receiver is attached with photodiode, such that, the signal can be
transmit through LED and receive by Photodiode. The design of the VLC system
involved idea of generating negative voltage, signal amplification, compensating
background light intensity, recovering attenuated signal. In this project, two
prototypes i.e. VLC audio transmitter and receiver, VLC free space opto-transceiver
have been designed and constructed. These prototypes have successfully been
demonstrated for transmission of audio signal and digital signal. The VLC audio
transmitter and receiver demonstrated the transmission of audio signal from
computer to speaker wirelessly and VLC Free space Opo-Transceiver demonstrated
the transmission of digital signal from computer to computer wirelessly as well. Both
prototypes signal are transmitted through visible light