The IoT wearable stretch sensor using 3D-Graphene foam

In this work, we have developed flexible and wearable Stretch Sensor based on the Internet of thing technology. These sensors were realized using a 3D-Graphene foam amalgam with Polydimethylsiloxane (PDMS). To demonstrate the 3D-graphene foam sensors, we constructed an armband muscle measurement using such sensors and developed software based on IoT for real-time muscle expansion and stretch tracking. Wi-Fi was used to transfer data from the sensor to a cloud via web-socket based on Node.js. The data are display expansion of muscle on a website. This muscle stretch tracking is very useful in many contexts such as workout performance measuring, rehabilitation and tele-robotics application. The wearable stretch sensor is consisting of two pieces of 5 centimeters 3D-graphene foam strip and packed with clasped by conductive epoxy. For accuracy, at the end of sensor edge are coated with silver paste for better conductivity. Main CPU uses Intel Edison, which made the sensor connect to the Internet easier. In order to deploy this sensor with another application the ADXL335 was chosen as a 3-axis accelerometer for tracking of gestures or fitness tracking application. An accelerometer was attached to the down side of the Intel Edison main CPU board and including battery and analog to digital converter circuit.