Occupancy sensor
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An occupancy sensor is a device used to detect the presence of a person. Applications include automatic adjustment of lights or temperature or ventilation systems in response to the quantity of people
An indoor light switch equipped with a PIR-based occupancy sensor
Passive infrared sensor
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A passive infrared sensor is an electronic device that measures infrared radiation emitted by objects in its field of view. They are most commonly used in motion detectors, including security alarms a
Occupancy sensor
…the quantity of people present. The sensors typically use infrared, ultrasonic, or microwave technology. The term encompasses devices as different as PIR sensors, hotel room keycard locks and smart meters. Occupancy sensors are typically used to save energy, provide automatic control, and comply with building…
Typical residential/commercial PIR-based motion detector (PID).
A PIR motion detector used to control an outdoor, automatic light.
A camera trap with PIR motion detector.