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

This project is an interactive Arduino-based piano that plays musical notes and a song stored on an SD card. It also includes a sound spectrum visualizer using an LED matrix, which reacts to the audio ...

The microphone sound sensor – Grove Sound Sensor (v1.6) – is built around the popular dual-op amp IC LM358 and provides an analog signal output. The recommended operating voltage is 5V what makes it ...