TEXT, AUDIO AND IMAGE TRANSMISSION USING LIGHT-FIDELITY [Li-Fi] TECHNOLOGY

The exponential growth of wireless data traffic and the increasing limitations of radio frequency (RF) spectrum have driven the need for alternative high-bandwidth and interference-free communication technologies.Light-Fidelity (Li-Fi), a subset of Visible Light Communication (VLC), has emerged as a promising solution by utilizing light-emitting diodes (LEDs) for high-speed wireless data transmission.This paper presents the design and implementation of a Li-Fibased system capable of transmitting text, audio, and image data using intensity modulation of visible light.The proposed system employs microcontroller-based encoding at the transmitter to modulate LED light signals according to the input data, while a photodetector-based receiver decodes the transmitted information using signal conditioning and amplification circuits.Text data is transmitted using serial communication protocols, audio signals are conveyed through real-time analog modulation, and image data is transferred as sequential binary streams and reconstructed at the receiver end.Experimental results demonstrate reliable short-range indoor communication with minimal electromagnetic interference and improved data security compared to conventional RF-based systems.The study validates Li-Fi as a costeffective, energy-efficient, and secure wireless communication technology suitable for multimedia data transmission in environments where RF communication is constrained.The proposed system highlights the potential of Li-Fi for future applications in smart indoor communication, healthcare, educational institutions, and secure data transmission systems.