[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 ...

I recently had to build an infrared close proximity sensor that could tell if something was dropped in a parcel delivery drop box. ... unlike passive infrared sensors which detect objects by sensing ...

It should be a piece of cake if you program your Attiny85 chip (not Digispark) using your existing Arduino IDE with the help of one “USB tiny ISP (v2.0)” programmer. The software/Arduino sketch /* * ...

Passive infrared (PIR) sensors detect infrared energy radiating from objects within their field of vision. Resources; ... Sensor Sense: Passive Infrared-Motion Sensors. July 10, 2008.

Makers and developers looking for a motion sensor Arduino Shield, are sure to be interested in this new ICU-Duino which has been created by Patrick Thomas Mitchell based in Ottawa, Canada ...