What about Microwave Motion Detectors.

Pgumby68

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Microwave detectors send out a signal and look for a return. Moving objects will reflect back some of the energy to set off the detector.
 

Archilochus

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Hi Pg,
Check the specs for power consumption on those units.  All I've seen are over 25+ mA.  Other problem is they will detect ANY fairly solid moving object - not just 'warm-bodied' animals.  Some might find that useful in specific circumstances.
A good use of the microwave detectors is to make a 'hybrid' system (I've got one on the drawing board).  Use a regular passive detector AND a microwave detector.  The passive is on 24/7.  When it detects motion, it powers-up the microwave detector.  Only when BOTH the passive AND microwave detectors have agreed that there is indeed something moving, will a pick be taken.  This virtually eliminates falsing while maintaining low power consumption.

Archilochus


(Edited by Archilochus at 4:23 pm on June 4, 2002)
 

Pgumby68

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Hey Arch,
I'd like to see the drawings of that when you get done. I did a little research into that myself , but I'm not that ambitious. Just lazy I guess.
 

kmitch

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Arch,

I've considered doing the same thing. I picked up a geophone that is pretty sensitive. Use the geophone to pick up footsteps and the PIR to pick up the moving heat. The geophone was pretty cheap, $2.50 and probably has $5.00 worth of scrap brass. Only fire the camera when there is a signal from both.

Keith
 

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