Peter,
I like your creativity, that is an interesting way.  Still I am wondering
about a battery operated system.  I don't think the self-heated would be low
current.

The security system methode is intersting, but again, I think they would
drain a battery.

I would like to find something that could wake a PIC from sleep with ultra
low current for sensing.
I plan to play with some photo transistors, and some photo resistors.
I wory about staturation of the photo-transistors, and wory about the small
swing of the photo resistors.  Time to tinker.

Best regards,
Giles

>
>I have just discovered that a self heated thermistor can detect people and
>large moving objects as long as they move some air past it. This should
>work fine if there are no fans (or wind) blowing into it.
>
>Peter


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