A method that can be used to more easily perform human body communication, (HBC) has been developed. In the proposed method, Arduino technology is used as a wearable device. Baseband communication is used in this study. Baseband communication uses an operational amplifier to amplify the signal generated by the Arduino, device and uses a comparator to remove noise. This study experimented with a biological tissue equivalent phantom. An application was developed to measure temperature and confirm the transmission and reception of a string. We successfully transmitted a string using HBC with a simple circuit. In addition, changes in impedance and voltage in the electrode were measured. Our experimental results confirm effective HBC in the 300 Hz band.