International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 09 | Sep 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1512 TEXT, VOICE AND IMAGE TRANSMISSION USING VISIBLE LIGHT COMMUNICATION A. Palani Raj 1 , P. Freshton Jebastin 2 , M. Naveen Kumar 3 , K.K. Rusheyandhaar 4 [1] Assistant Professor, Information Technology Department, Panimalar Institute of Technology, Chennai, India. [2],[3],[4] UG scholar, Information Technology Department, Panimalar Institute of Technology, Chennai, India. ------------------------------------------------------------------------***------------------------------------------------------------------- Abstract— Over the years, the overdependence on Wireless Fidelity (Wi-Fi) for data transmission necessitated the need for an alternate and more reliable means of communication, hence, Light Fidelity (Li-Fi). It involves the use of Light Emitting Diode to transmit data by blinking (i.e. switching them On and Off) at a speed not noticeable to the eye. This paper proposed the development of the Li-Fi system using off the shelf electronic components. The proposed system utilizes an embedded system with dual-core Advanced Virtual RISC (AVR) microcontroller (ATmega16L) interfaced to input/output circuits comprising of the Light Emitting Diode (LED), LM358N Operational Amplifier and a photodiode. Also, by developing a user (Receiver PC) interface using Embedded C programming, the sample data (text, voice and image) transferred was monitored and the speed, efficiency, security and capacity of the system was examined and discovered to be top notch. This would make the system an indispensable means of communication in the nearest future. This data transmission system is different from those in existence because expensive components were not in the design, invariably reducing the overall cost of the implementation. 1. INTRODUCTION Light Fidelity (Li-Fi) is a high speed, wireless communication using visible light. It falls under the category of optical wireless communications. Data transmission takes place through Light Emitting Diode (LED) bulbs whose intensity varies. Based on this variation, communication occurs digitally. This technology has vast applications where the use of Wi-Fi is limited or banned. It also takes out the adverse health effects of using electromagnetic waves. Unless light is seen , data can‟t be hacked and so data transmission is secure. Data transmission is typically in terms of Gigabytes per second [1]. The use of light as a means to transmit data has been coined Li-Fi. The high- speed communication technology is similar to Wi-Fi but is faster, allowing you to send and receive more data in less time. By swapping incandescent bulbs with LEDs - which have electronic properties - Li-Fi could bring Internet access to more areas and could revolutionize the telecommunications industry. The speed of data transmission is about 10 Mbps, though it is aimed to improve up to 100 Mbps by 2022 [2]. Recently, wireless technology has bloomed to a great extent such that wireless technology requires a large amount of data to transmit every day. Nowadays, wireless communications have become important in the communication process. The main means of transmitting wireless data is by using electromagnetic waves i.e. radio waves. However, radio waves can support less bandwidth because of compact spectrum availability and intrusion. The solution to this is data transmission using Visible Light Communication (VLC). Wi-Fi deals with wireless coverage within premises, whereas Li-Fi is perfect for high compactness wireless data coverage in a defined area and for mitigating radio interference issues. Li-Fi basically focuses on transmitting multimedia data between two terminals using LEDs. 2. EXISTING SYSTEMS In today world communication between the devices is much common. These devices are using radio waves for short range wireless transmissions. Wi-fi and Bluetooth are currently the two prominent short range wireless technologies. The radio wave spectrum has certain key limitations which includes bandwidth consumption, efficiency, availability and security. DISADVANTAGES: [1] In radio wave spectrum data transmission security is very less. [2]Lot of data cannot be transferred simultaneously. [3]Health issues. [4]Bandwidth usage is limited. 3. PROPOSED SYSTEM Li-fi is a new technique of data transmission. LIFI data is transmitted by modulating the intensity of the light, which is then received by a photo detector. VLC(Visible Light Communication) technology consists of a light source as a transmitter and photo detector as receiver. In transmitter the electrical signals are converted into optic signals and transmitted through LED. The receiver contains photo detector. The photo detector converts the