Audio Transmission Using LiFi
Wireless audio communication through visible light
Project Overview
This project implemented a LiFi-based audio transmission system using visible light communication (VLC) principles. A 1W white LED was used to transmit analog audio signals, while a solar panel photodetector received the modulated light and converted it back into an audio signal, which was amplified and played through a speaker.
Key Features
💡 Visible Light Communication (VLC): Audio transmitted via intensity modulation of LED light
🔦 Transmitter Design: LED driven by analog audio input from a mobile device
🔋 Receiver Circuit: Solar panel as photodetector with LM386-based amplifier
🔊 Real-Time Playback: Reconstructed audio output with minimal distortion
Research Contributions
Demonstrated LiFi as a practical alternative to traditional RF-based wireless systems
Designed and tested a low-cost VLC prototype for audio transmission
Analyzed performance, advantages, and limitations of light-based communication
Technical Achievements
Built a working LiFi system transmitting audio over visible light
Achieved secure, room-confined communication with low latency
Identified practical challenges such as range limitations and interference from ambient light
Applications
Secure Communication: LiFi signals confined to a room, preventing external interception
Hospitals & Aviation: Safe data transmission without RF interference
Public Internet Access: Potential integration with streetlights for low-cost connectivity
Assistive Devices & Education: Enhancing wireless access in sensitive environments
Impact and Recognition
This project showcased the potential of LiFi technology as a secure and efficient alternative to WiFi for short-range communication, highlighting the advantages of low cost, energy efficiency, and high bandwidth capacity
Project Report
lifi-report.pdf