Human detection - PIR sensor

[leonel]

Hello.
I'm trying to make a circuit that could do human detection. I will use the attatched PIR sensor, that has a circuit in pag. 7, that's the typical Application Circuit (Human detection). Can anybody explain me more or less what the circuit does in stages?
Regards

 

[adamthole]

That circuit is pretty complicated. You can build it if you want, but I would reccomend using a PIR Control Chip. The only control chip I've found is:

https://www.electro-tech-online.com/custompdfs/2005/08/kc778b.pdf

I have used it in my PIR detection circuits, and it works great.

You can but the chip, a PIR Detector, and the fresnel lens all from this site:

**broken link removed**

Their is also a kit for 20 dollars, if your interested in that.

 

[zachtheterrible]

If you're interested, allelectronics.com has a pre-built PIR motion detector for only $11. https://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=PIR-3&type=store

I bought one, but havent got around to using it yet. I fiddled around with it and couldnt figure out how to get an output out of it, but im sure that itll work just fine.