2009/4/2 Bob Axtell <bob.axtell@gmail.com>:
> Actually, there is another way to use PIR.
>
> As a result of the Big Bang, in almost every direction there is a
> constant but faint
> deep red glow. If you purchase very sensitive PIR detectors, you can
> detect a person
> as he walks between the sky and the sensor (blocking) at several
> hundred feet. Even works in daylight. You will need to search for the
> most sensitive detector; I think only the Japanese
> make them (Hammatsu-sp?).
>
> --Bob
>


Bob
If you have a sensor sensitive enough to see the "deep red glow",
wouldn't a person be like a bright torch standing in from of it?

RP
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