By attaching a microphone to an Arduino, you open up a new world of things to try. • Measure the sound intensity - Turn on a red light if it gets too loud! • Give sound commands: two claps turns on a ...

This module shows how to use the Adafruit electret microphone to measure frequency. A companion module explores loudness. The presentation material and the code can be downloaded at SoundPitch.

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