A Customizable Wireless Sensor System for Estimating and Transmitting Human Stress Levels Biosignals with IoT Platform

Stress is a natural reaction of our body when we are facing new emotions and demanding tasks at our daily lives. Anxiety further enhances the feeling of fear. In addition, anxiety is caused due to a stimulus that makes people feeling weak, because of an overall insecurity regarding what is going to happen. The difference between stress and anxiety lies in the fact that stress is an internal emotion as opposed to external psycho - compressive factors that constitute stress (i.e. such as a loss of a beloved person, a natural disaster, pressure in working conditions etc.). In this paper, we design, propose and test a wireless sensor system for measuring and transmitting biometric magnitudes of heart rate and blood oximetry. Parts of our system can be easily attached to a set of persons, who take part in an experimental process of controlled stress and anxiety environment and record stress biosignals. Our system is based on a lightweight customized 802.15.4 wireless protocol design, able to guarantee energy efficiency of our testbed