'Person detector module'
>Complete ready to go motion detector modyule only requires a small speaker
>and 4.5VDC (3 batteries) to operate. Unit uses sophisticated IC to detect
>tiny changes in the ambient light level as an intruder comes near
>(works up to 10 feet away). It then sounds an alarm tone for a preset
>time period from the speaker and then resets itself. Comes with complete
>simple hookup info.
>Obviously this module will only work in a litup area.
Not necessarily. I've got a similar device for when I go backpacking. It's
an infrared (PIR) detector with an alarm which sounds for about a minute.
Mine also has a 'keyfob' infrared switch to activate and deactivate it. I
guess these boards came from something similar.
>Kalle Pihlajasaari data.co.zakalle
Keith Dowsett "Variables won't; constants aren't."
Snail mail: MRC Clinical Sciences Centre, Cyclotron Unit.
Hammersmith Hospital. London W12 0NN.
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