Review on Audio, Image and Text Transmission Using Li-Fi Technology

Abstract: In this project, a system for transmission of audio, text, and image data using Li-Fi (Light Fidelity) and RF (Radio Frequency) technologies has been developed. For high-speed, short- range data communication, Li-Fi uses visible light while RF is used for long-range audio signal transmission. The combination of these two technologies is a demonstration of a hybrid communication system that enables it to transmit various formats of data at the same time. The project is implemented using Arduino UNO, LED transmitter, LDR/Photodiode receiver, LCD Display, Speaker, and Audio RF module. This system is intended to demonstrate a low cost, energy-efficient and secure method of wireless data transmission for multimedia communication. The demand for high-speed and secure wireless communication has increased to a great extent as the use of internet-based services increases. Traditional wireless technologies like Wi-Fi and Bluetooth depend on radio frequency (RF) spectrum which is facing challenges of congestion, interference and security risks. To solve these problems, Li-Fi (Light Fidelity) technology has emerged as a promising solution to these problems, using the visible light spectrum to transmit data. This project shows a prototype of Li-Fi based Audio, text and image transmission system. The system uses high-brightness LEDs as transmitters and photodiodes as receivers. Audio is transmitted by pulse width modulation (PWM) and text and image information are transmitted by digital encoding techniques. An Arduino microcontroller is used for the modulation, encoding, decoding, and system control. The output is reproduced in the form of sound via a speaker, texts on a 16x2 LCD and images on a 128x64 graphical LCD display. The proposed system shows the success of Li-Fi in providing secure, cost- effective and interference-free multimedia communication. Although the system is limited by line-of-sight requirements and restrictions in range, it provides a basis for further development in highspeed visible light communication systems.