I recently had to build an infrared close proximity sensor that could tell if something was dropped in a parcel delivery drop box. After some searching, I ended up using a microcontroller and a piece ...

anyone got any sites that have em, I just got a RF Remote with a RF to IR converter box that works with all my Home Theater equipment, and I'd like to setup my PC to also use it, I have very cheap ...

This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The ...