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Bob,

Smack goes the hand on my forehead!  In my looking around I saw a couple of
these and it would work.  Set a light on top of the CPU tower and I'd see &
notice it from anywhere in my office!

When you position a passive infrared sensor, be sure to place it where
the traffic does not come straight toward the sensor, but instead
moves across it. Cheap passive IRs tend to not notice straight on
changes until they are very close. If it is across for the doorway,
you may have better luck by turning the sensor 90 degrees so its field
of vision changes axis.

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