Portable biological signal measurement system for biofeedback and experiment for functional assessment

This paper presents a biological signal measurement system for biofeedback. The system was assembled based on system design concept, “portable” and “inexpensive,” in order to spread the biofeedback among people who want to promote their mental health and performance improvement. If a biofeedback system is portable, you are able to spend daily life wearing the system, and then the biofeedback will effectively work on mental problem or performance improvement for the user. Moreover, if a biofeedback system is made at low cost, most people who need some help for mental health are able to have their own biofeedback system. The assembled biological signal measurement system consists of an Android OS smart phone, micro controller (Arduino Mega ADK), and three biological sensors. The Android OS smart phone was adopted because of its compact size and cost. Experiments were conducted to verify the functions of the biological signal measurement system, and then the system could successfully capture the transitions of the subjects´ mental conditions for biofeedback.