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Joined: Mon Jul 03, 2017 5:46 am
Posts: 1117
Location: Australia
Good morning all, whilst things are a bit slow on the forums l have a question about the performance of a PIR. Why do car headlights stop a PIR from detecting motion? I have a motion detector set up on my road to my ranch house. It is set at 90 degrees to the road - not pointing directly up or down the road. In the daylight it works perfectly, detecting virtually anything moving along the road, in the night a vehicle can pass in either direction (with headlights on) & it fails to detect the vehicle eventhough it is huge, hot and within 10 feet of the PIR. Would it help to put a wing out both sides of the PIR, which maybe stops the headlight interfering with the detection circuit?

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Are you sure the camera is setup to take pictures at night? Depending on camera systems are set up to take pictures, days only, nights only, or day & night. Car lighting usually has no affect short term on the light sensor.

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Headlights should have nothing to do with a PIR detecting or not detecting.  A PIR senses "Heat in Motion".....Not sure how a headlight could effect that.

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7 hours ago, Firemanjim said:

Headlights should have nothing to do with a PIR detecting or not detecting.  A PIR senses "Heat in Motion".....Not sure how a headlight could effect that.

That is others thoughts as well, also what l thought. I have done further testing and it is definitely the headlights (at least a dozen different cars and trucks). It was suggested that the unit may be faulty, l am going to exchange it for another on my next trip to town. Thanks for your reply.

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