Lighting color control system using smartphone with human body communication module

In order to prototype applications and evaluate characteristics of human body communication (HBC), transmitter/receiver modules were designed. A transmitter module incorporated a direct digital synthesizer (DDS) to provide a modulated signal. A receiver module utilized the 10.7-MHz intermediate frequency part of the low-power radio receiver module. These newly designed modules are compatible with wide range of systems because the interfaces of the modules consist of USB port. As an example, a lighting color control system was implemented by using the HBC modules and a smartphone. This system realized intuitive color control of the lighting.