Visible light communication channel with a smartphone screen as a transmitter and color shift keying modulation for access control applications

Smartphones or tablets are a new kind of mobile device that allows developers the optical wireless communication. This enables a low-cost implementation interface with a visible light communication system. The present work aims to implement the access control system based on visible light communication channel with a smartphone screen as a transmitter and color shift keying modulation. The proposed system runs on the Samsung Galaxy notebook tablet to control the light colors emitted by the screen. We used Android Studio to develop the application for access control system. In this scheme, the optical response of the Galaxy screen to 4 color shift keying constellation design based on standard color space is also discussed. The proposed system is validated by experimental tests for access control applications. The results obtained suggest that a bit rate of 100 b/s can be achieved with a 4 color shift keying constellation format. It was concluded that the main advantage of using the Galaxy screen as a transmitter in a visible light communication lies in the low complexity to generate color shift keying modulation and its application on access control system. This can generate opportunities for this method to become realistic on mobile consumer electronics.