PIR Sensor
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PIR Sensor

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(Passive InfraRed sensor) A device used to detect motion by receiving infrared radiation. When a person walks past the sensor, it detects a rapid change of infrared energy and sends a signal. PIR sensors are used for applications such as automatically turning on lights when someone enters a room or causing a video camera to begin operating.
This passive method is not as reliable as “active” motion sensors that either bounce back a radar signal or transmit light to a photodetector in the distance.

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