A passive infrared sensor(pir sensor) is an electronic sensor that measures infrared(ir) light radiating from objects in its field of view.
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A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors. ... The term passive refers to the fact that PIR devices do not radiate energy for detection purposes.
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