Data Transmission Using Li-Fi
Keywords:
Arduino, visible light communication, photodiode, Li-Fi, data transmissionAbstract
The increasing reliance on traditional radio-frequency (RF) wireless communication technologies have introduced significant challenges, including spectrum congestion, electromagnetic interference, and growing security vulnerabilities. To address these limitations, Light Fidelity (Li-Fi) emerges as an innovative alternative that utilizes the vast visible light spectrum for high-speed, secure data transmission. This paper investigates the practical implementation of Visible Light Communication (VLC) by developing a microcontroller-based Li-Fi prototype capable of transmitting alphanumeric characters in real time. The system employs a high-brightness Light Emitting Diode (LED) as the transmitter, modulated via On-Off Keying (OOK), and a highly sensitive photodiode paired with a transimpedance amplifier at the receiver end to capture and decode the optical signals. Experimental testing confirms the successful reconstruction of transmitted data under controlled indoor conditions, highlighting the system's accuracy and energy efficiency. Furthermore, this study analyses the physical constraints of optical communication, such as ambient light interference and line-of-sight dependency, providing a foundational understanding of the technology and offering insights for the future deployment of Li-Fi in secure and interference-free environments.
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