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 ...

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.

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 ...