pir sunlight saturation

[danpir]

Hi All,

I want to use a dual element or quad element pir in a car as part of an alarm system. sunlight is playing havoc with my plans and I was wondering if there was a way to filter out false alarms caused by sunlight saturation?

 

[FvM]

PIR with motion detector interference filter aren't sensitive to sunlight. The might react on objects heated up by sunlight.

 

[jiripolivka]

Any PIR sensor generates a slow output whenever it "sees" a warm object. While using a PIR sensor at home can be set up to avoid objects heated by the sunlight, in a car it is almost not avoidable. Try to use rather an ultrasonic sensor, no problems with sunlight or high temperature.