Infrared PIR Motion Sensor Switch
*DC 12 Volt
*2 Amp
An Infrared PIR (Passive Infrared) Motion Sensor Switch is an electronic device that detects movement by sensing infrared (IR) light emitted by warm objects, like humans. It’s commonly used in automatic lighting systems, security alarms, and other applications where motion detection is needed. When the sensor detects a change in infrared radiation (meaning movement), it triggers a connected device, like a light, to turn on.
Here’s a more detailed breakdown:
How it works:
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Passive Infrared Detection:PIR sensors are “passive” because they don’t emit their infrared radiation. Instead, they detect the infrared radiation naturally emitted by objects with a temperature above absolute zero.
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Dual Sensors:Most PIR sensors have two infrared-sensitive elements (slots). These elements detect the infrared radiation from the environment. When a warm object (like a person) moves into the sensor’s field of view, the amount of infrared radiation detected by the two elements changes, creating a differential change that triggers the sensor.
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Detection Range:PIR sensors have a specific detection range and angle, often 120 degrees and up to 10 meters, depending on the model.
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Automatic Activation:When the sensor detects motion, it activates the connected device (e.g., turns on a light).
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Time Delay:Many PIR sensors also have an adjustable time delay, meaning the connected device will stay on for a set period after the motion is no longer detected, before automatically turning off.
Common Applications:
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Automatic Lighting:PIR sensors are widely used in automatic lighting systems for hallways, staircases, bathrooms, garages, and other areas where lights should turn on when someone enters.
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Security Systems:They are a key component in security systems, triggering alarms when motion is detected.
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Energy Saving:By automatically turning lights on and off, PIR sensors help conserve energy and reduce electricity costs.
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