Re: NOW: PIRs WAS: Stair Mats

["PatrickLidstone" <patrick@xxxxxxx>]

> The one huge caveat with PIRs in general is positioning IME, if 
they are
> not positioned correctly then they won't work. By that the I 
include the
> direction they are aimed in, the height and what kind of room/area
they
> are in, often in larger rooms and especially hallways more than one
is
> needed to give reliable coverage. Obviously if positioning is an 
issue
> then the more sensitive you can get the PIR the better.

It's also worth remembering that the more upmarket PIR's have a 
jumper-selectable "hit rate" to improve immunity to false
triggers. 
In occupancy detection situations this is usually the inverse of the 
desired performance...

Patrick

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