They’re using a cheap sound sensor module and an Arduino to catch instantaneous photographs, with students caught in the act of popping balloons.

Power-wise, these warmers use a 18650 cell and a TP4056 charging module. Everything is controlled by an Arduino Nano, which reads from both a thermistor and a potentiometer to control the output.

To understand the functionality of the Grove Sound Sensor module, you must take a closer look into the schematic of the sensor module that shows you how the electronic components are wired together.