On 4/16/09, Bob Axtell <bob.axtell@gmail.com> wrote:
> I have spent time tinkering with these things, too.
>
> Low frequency IR sensors sense MOTION, not temperature, by detecting
> differences between two detector segments inside the PIR sensor. I
> doubt that it can be made to detect absolute temperature.

Bob, read the Wien Boltzman laws, this will clarify many things for you.

Vasile
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