5d • Check Your Knowledge
⚡ Trade Knowledge — What Does That Motion Detector See? ⚡
You walk into a room protected by a passive infrared (PIR) motion detector, and it detects your movement.
What is the PIR sensor actually detecting?
A. Sound waves bouncing off your body.
B. Changes in infrared energy across its detection zones as you move.
C. A change in air pressure when you enter the room.
D. A magnetic field created by your movement.
Drop your choice in the comments. New to alarm systems? Take a guess. That’s how we learn.
We’ll reveal the answer and explanation in a couple of days. 👀
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⚡ Trade Knowledge — What Does That Motion Detector See? ⚡
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