PIR and PIC

[homemade24]

with a lot of my hobby projects I interface a PIR motion sensor (prefab store bought unit) to a PIC micro, In my quest to learn and build. I wondered if maybe I could build my own. after searching the web I came across this
How Infrared Motion Detector Components Work
I was think maybe you could connect a pyroelectric sensor directly to a PIC
and use it's on board comparator.
just wondering if anyone has done something like this or have any input on this
as always
thanks

 

[Nigel Goodwin]

You need to amplify it first, you also have the problems of the optical assembly - which it's useless without. Far easier, and cheaper, just to buy one.

 

[homemade24]

In my quest to learn and build

thanks Nigel but like I posted it's not about money and not sure what your calling the optical assembly

 

[Nigel Goodwin]

thanks Nigel but like I posted it's not about money and not sure what your calling the optical assembly

The fresnel lens on the front, it's really that that makes it work.

 

[homemade24]

The fresnel lens on the front

yep I got about a dozen in a drawer both .65 and .9 and yes this lens can and does adjust the detection angle and distance and how big what ever is causing the motion to trip the PIR
thanks

 

[be80be]

You got all you need that site you posted tells you all about it and more. I have been playing with a pir I got 1 from radio shack it didn't cost much it's made by parallax you can do a lot with it. I all remove some old PIR325 out of lites that didn't work got them to work at about 6 in. away I didn't have a box of fresnel lens so gave up on the ideal of making 1 my self

 

[homemade24]

10-4
I have use the one's from RS

I like this better used about 30 only had 1 go bad
if you use a different lens you can get 30 yds.

**broken link removed**
thanks