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> Does anyone have info on connecting a PIR sensor
> to a PIC?? This would be great for devices or
> lighting systems that activate when you enter
> the room, etc. A great use for a PIC. :o)
> -Roman

I use this for a battery-operated indoor application. It has very
low power requirements (140uA @ 5V). The 5V supply comes
from a PIC pin which turns the PIR off with a logic "0" after the
PIR has woken the PIC from sleep.

The sensors are from Murata. A proper Fresnel lens is essential -
the response to PIR in the low Hz is far better than with no lens
and the range (7-8 metres) is around 10 times greater. There
are more sophisticated circuits in security lights, based on quad
amps like the LM324. I've no need for that as occasional false
triggering is no big disadvantage in my application, but there
are ultra-low power around that could replace the standard type

One improvement I'd like to make to this circuit is a self-settling
function. Replacing the trimpot with a fixed RC filter that responds
quickly to (relatively) fast wave bumps such as caused by a body
but ignores drafts or increasing/decreasing sunlight

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