Visible Light Communication-Based Indoor Notification System for Blind People

Visible Light Communication (VLC) is a wireless communication which utilizes the visible light as the medium for data transfer. In this project, a VLC-based Indoor Notification System is proposed to help the blind people, and as a proof the concept (PoC) of VLC-based Indoor Notification System (ILS) through the developing of a prototype system. Furthermore, the performance of the developed system is evaluated in terms of distance between the transmitter and the receiver, line of sight for the VLC system, and stabilities of the system. Arduino Uno is used as the microcontroller to drive the phosphor converted LED bulb for audio transmission. The receiver circuit contain of solar cell to receive the audio signal and Divoom iFit-1 portable speaker to playback the audio instruction. Besides, the programming code to send the audio instruction via pc-LED bulb for the Arduino Uno has been developed to ensure the successfulness of the project. As the result, the transmitted audio instruction is successfully playback by the portable speaker. By increasing the distance between the transmitter and the receiver more than 50 cm or the solar cell is slightly out of the line of sight of the light beam emitted by the pc-LED bulb, the audio volume is getting weaker and furthermore causing the communication to be disconnected. The system can operate in any indoor environment because it is not getting any interruption from the radiation frequency. In conclusion, VLC has the potential to replace others wireless communication system in the future.