Passive infrared (PIR) sensor tutorial
posted Aug 21st 2009 1:00pm by Phil Burgessfiled under: arduino hacks
[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 can be put to other uses—cat flaps, camera triggers and purely artistic applications—as you’ll see in several demo projects and videos. For the curious, the tutorial provides a good amount of background theory on how PIR sensors work, along with the associated fresnel lens optics. And for those who just want to get hacking, most PIR sensors (like the one above) come in a simple-to-interface module containing all the support hardware and providing a simple digital output; the article wraps up with one such example.
Not a bad PIR tutorial but This one‘s still my favorite. The manual from the product page is even more detailed, but it’s in pdf form.