On Fri, 27 Oct 2006 08:01:00 +0100, M.Joshi
put finger to keyboard and composed:

Should PIR sensors be placed facing away from a window to avoid false
triggering?

You should put them on the opposite wall to avoid false triggering by
rustling curtains. Place them in a corner so that they face across the
window, not directly at it. A PIR is most sensitive when an intruder
moves across it rather than toward it. For more reliable triggering,
I'd suggest a dual sensor, ie one that combines a PIR and a microwave
detector. The latter is insensitive to heat variations.

- Franc Zabkar
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