International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 04 | Apr 2025
p-ISSN: 2395-0072
www.irjet.net
LIFI TECHNOLOGY FOR WIRELESS DATA TRANSFER NERUSU PRAVEEN KUMAR1, N.Visranthamma2, YADAVALLI.RAMYA SRI 3, ULISI.TARUN KUMAR4, POTHANA PREM SRI BALAJI 5 1Student & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY
2Assistant Professor & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY 3Student & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY 4Student & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY 5Student & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY
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Abstract -
spectrum, has led researchers and technologists to explore alternative, more efficient forms of wireless communication. One such promising innovation is Li-Fi (Light Fidelity), a cutting-edge optical wireless communication technology that leverages visible light for high-speed data transmission.
Li-Fi (Light Fidelity) is an innovative and emerging wireless communication technology that utilizes visible light for data transmission, offering a promising alternative to traditional radio frequency-based wireless systems such as Wi-Fi and Bluetooth. This technology leverages the visible light spectrum, which is 10,000 times larger than the radio frequency spectrum, thereby addressing the growing demand for high-speed and highbandwidth data communication. Li-Fi operates by modulating the intensity of light emitted from a light source, such as an LED, which is then detected by a photodetector or photodiode at the receiver’s end and converted back into data. This method of communication enables extremely high-speed data transfer with minimal interference and added security, making it particularly suitable for environments where radio frequencies are either restricted or unreliable.
Li-Fi was first introduced by Professor Harald Haas of the University of Edinburgh in 2011, when he demonstrated the concept of using a simple LED bulb as a high-speed data transmitter. Since then, Li-Fi has attracted widespread attention due to its ability to provide wireless internet access with significantly higher speeds, enhanced security, and reduced interference compared to traditional RF-based systems. Unlike Wi-Fi, which transmits data through radio waves, Li-Fi transmits data through the modulation of light intensity emitted by an LED. These modulated light signals are imperceptible to the human eye but can be detected by a photodetector or photodiode and converted back into electrical signals for data processing. This fundamental shift in the medium of data transmission opens new avenues for wireless communication, especially in environments where RF communication is either undesirable, restricted, or inefficient.
This research paper explores the development and implementation of a low-cost, prototype Li-Fi system designed to demonstrate wireless data transmission using visible light. The core components of the system include two ESP32 microcontroller modules—one acting as the sender (transmitter) and the other as the receiver.
The visible light spectrum, which ranges from 400 THz to 800 THz, offers a bandwidth that is approximately 10,000 times greater than that of the entire RF spectrum. This vast, untapped resource makes Li-Fi an attractive solution for addressing the spectrum crunch faced by current wireless communication systems. Furthermore, Li-Fi's reliance on visible light makes it inherently secure, as light cannot pass through opaque walls, thus confining communication to a specific physical space. This feature significantly reduces the risk of unauthorized access or eavesdropping, making Li-Fi an ideal choice for secure communications in sensitive environments such as government facilities, hospitals, military zones, and aircraft cabins.
Keywords: Automatic Marks Sending System, SMS Notification,GSM Module (SIM900),RFID Technology,Student Information System,Real-Time Communication,Arduino, Embedded Systems
1.INTRODUCTION In the era of rapid technological advancement and ever-growing demand for faster, more secure, and interference-free communication systems, wireless data transfer technologies have become a foundational component of modern digital infrastructure. Among these, radio frequency (RF)-based systems such as Wi-Fi, Bluetooth, and cellular networks have dominated the wireless communication landscape for decades. However, the exponential rise in the number of connected devices, coupled with the saturation of the radio frequency
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This research paper presents the design, development, and implementation of a low-cost, prototype Li-Fi communication system using ESP32 microcontroller
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