Wireless Communication using Li-Fi Technology

The efficiency, durability, and lifetime of light-emitting diodes (LEDs) have led to their use in a variety of applications, including general illumination, vehicle lights, sign age, and displays ,In fact, it is often predicted that LED bulbs will soon replace all traditional incandescent bulbs, as well as compact fluorescent alternatives, in general lighting applications It has long been recognized that LEDs used in such systems can be simultaneously modulated to provide a dual function of communications. Proposed applications for visible light communications (VLC) include indoor local area networks through room lighting in-flight data downlinks through airplane reading lamps intelligent transportation positioning in wireless sensor networks and underwater. We have designed a prototype LIFI system to transfer datas as well as Files. Our idea is to send data and file as serial datas using UART serial communication from one PC to another PC using VLC. So we have used the visible light communication at the transmitting end and also for reception we are using photodiodes at the receiving PC. We have deployed PIC microcontroller for toggling of the LED at the transmitting end and again for binary conversion of received stream of data into a suitable file to be recognized by the PC software. Photo diode transistor is used to recover the data from visible light and inverting amplifier is used to get the data and processed by pic controller connected to PC serial communication port as well as Android Phone using OTG cable.it can be used wherever LED light source is available. KeywordsLiFi (Light Fidelity), WiFi (Wireless Fidelity), VLC (Visible Light Communication), LED (Light Emitting Diode), IEEE (Institute of Electrical and Electronics Engineers), RF (Radio Frequency), ALA(American Lighting Association )