Abstract. The article proposes a data transmission system based on VLC technology using a new physical coding. The transfer of character data from one personal computer to another was realized using a white illuminating LED. When transferring data, a driver was used to control the LED. Instead of the standard physical coding approach, where one clock corresponds to a value of 0 and one clock to a value of 1, expressed in the maximum power of the LED, a new coding was implemented. This approach in two clock cycles at 0 voltage determines 0 in binary coding, and at a voltage that provides the maximum power of the LED, identifies 1 in binary. Although the baud rate is reduced, the reliability is improved by using two bits.

Keywords: optical wireless communication, VLC, LED, microcontroller.