How do motion sensor lights work? Those outdoor lamps that switch on when you walk by use passive infrared sensors. They detect tiny changes in infrared radiation when a warm body moves across their field of view. The sensor triggers a circuit that powers the light instantly. Engineers design them to ignore small fluctuations like wind or rain, so they only react to significant movement. A simple, brilliant mix of electronics and safety. | Electricalgram
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How Science Can Help You Open a Locked Door! A passive infrared (PIR) motion sensor is an electronic device that detects motion by sensing changes in infrared radiation, primarily emitted by warm objects like humans and animals. Unlike active sensors, PIR sensors do not emit any signals; instead, they passively detect infrared radiation through two or more pyroelectric elements that generate a voltage when they detect changes in radiation levels. Typically, these sensors have a detection range o
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2.7K views · 13 reactions | How do motion sensor lights work? Those outdoor lamps that switch on when you walk by use passive infrared sensors. They detect tiny changes in infrared radiation when a warm body moves across their field of view. The sensor triggers a circuit that powers the light instantly. Engineers design them to ignore small fluctuations like wind or rain, so they only react to significant movement. A simple, brilliant mix of electronics and safety. | Electricalgram | Facebook
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