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Bala Subramanian Ram
Virtual racer
 · TiruchirappalliIndia
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Guys I worked with pir sensors ,the minimum sensitive distance is around 2m ,it detects even very minute tracking so there is possibility it detects even moving paper,crow some thing like that

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Ashwanth Ash
Student
 · ChennaiIndia
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thats what , replace IR with Ultrasonic Sensor

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Darpan Pudasaini
Engineer, Electronics and Communication
 · KathmanduNepal
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Bala Subramanian Ram
I beg to differ.Good PIR sensors work only with living objects so paper should be out of the question. So far as birds are concerned, I guess there are few PIRs that are made immune to pets’ movements. Those can be used. Bur I wouldnt PIRs for outdoor purpose since light and heat from the sun can make the sensor behave in unwanted way as it is sensitive to temperature.
P.s. The house next to my office has PIRs installed above the compound gates. During office stays at night, the light is triggered annoyingly by dogs and cats.

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