[ladyada] has a freshly-published and amazingly thorough tutorial on passive infrared (PIR) motion sensors. Most often seen in security floodlights and automatic doors, in creative hands these sensors ...

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 ...

Tired of spending countless hours manually cleaning your pool? You're not alone. The tedious task of pool maintenance has long been a source of frustration for homeowners, but modern technology has ...