In this project, the focus is on the design and implementation of a Li-Fi data transmission system utilizing Arduino technology. Li-Fi is Light Fidelity, a technology that uses visible light communication (VLC) to transmit data through the modulation of LED light, which is received by a photodiode. It has been proven that this technology can successfully transmit text data through wireless communication over a short range in a energy-efficient and low-interference manner. Simulation experiments have resulted in a data transmission rate of 200 kbps, and hardware experimentation has resulted in a rate of 100 kbps, with reliable data communication at a distance of 1.5 m. These findings verify that Li-Fi could efficiently be used in secure and low-energy applications in a controlled environment, although there is a need to work on the distance, speed, and light conditions the technology can perform in.