An Arduino UNO takes the reading and generates a tone for an upward-facing speaker. A tiny ball bounces on that speaker where it occasionally collides with a piezoelectric element.

It’s ridiculously easy to lay hands on a cheap DC-to-AC inverter these days. They’re in just about every discount or variety store and let you magically plug in mains powered devices where no outlets ...

A DIY lamp may not sound like the most thrilling project on Earth, but the Luminch One is special. Not only does this hand-made light from Francisco Castro provide illumination -- the most ...