Simply put, unlike passive infrared sensors which detect objects by sensing changes in naturally emitted infrared, this active infrared close proximity sensor drives an infrared emitter to illuminate ...

For one, it only takes a small radio receiver to detect lightning strikes, and [mircemk] shows us exactly how to do that. When lightning flashes, it also lights up an incredibly wide spectrum of ...

TK has combined a PIR with an Arduino to create a smart safety light for the house or workshop. Follow along as this gets built out into a more extensive project.

Engineered with a polarization filter that allows only light received from a specially designed reflector to be recognized by the detector, the Series OPDM 12 retro-reflective laser sensors ...