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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 . PIR sensors are commonly used in security alarms and automatic lighting applications.
Normally, light from the light source shoots straight across and misses the sensor. When smoke enters the chamber, it scatters the light, which then hits the sensor and triggers the alarm. Photoelectric smoke detectors typically respond faster to a fire in its early, smoldering stage, before the source of the fire bursts into flames.
A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.
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Image credits: ElGrandeRojo67 #8. I have traveled lots of places in this world. The most scared I have ever been was lost in downtown Baltimore at night on a weekend.
AQABA, Jordan (Reuters) -The United States is working to bring home an American citizen found on Thursday in Syria, U.S. Secretary of State Antony Blinken said in Jordan, where he held meetings to ...
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