Pir Motion
Can I trigger a PIR motion detector with a stationary target (emitting 5-15um IR) that “appears” suddenly?
What I envision doing is to “tape” a heat source (small device utilizing nichrome or tungsten filament, emitting 5-15 um IR) on the outside of a PIR motion detector lens. When I want to manually trigger (emulate human motion) I would energize the heat source and hopefully be “detected”.
I have done some preliminary tests and found this not to work.
Does the target really have to *move* across two zones of the lens? I thought that by suddenly introducing heat to one zone, it would cause the imbalance / difference necessary to trigger the alarm?
Thanks for any help.
I believe motion is a key trigger of most of these PIR devices (at least the motion detecting ones). That is, without the hot spot moving, it won’t go off. Also, if you cover too much of the lens it might just confuse it for the ambient temperature increasing.
What you might try is having your heating element connected to one end of a heat sink, so when the power was turned on the heat would travel across the sink. Then put that in the field of vision. But this might be too slow to set it off.
PIR Motion Sensor Testing.
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