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

The Clapper was a goofy little device popular in the '80s and '90s that made it so you could turn on any outlet in your house with a clap. Make shows off how to build your own version of that ...

For parts, I needed three things: a sound sensor, a computer brain to run it and a place to store the data. The best-known tool of the open hardware movement is the Arduino, which costs about $30 ...