How do motion detectors work?
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Imagine you’re playing hide and seek with your friend, and your friend has a flashlight. When they shine the flashlight around, the light bounces off things and comes back to them, helping them find you.
Motion detectors work kind of like that flashlight game. They send out invisible waves (like the light from the flashlight) into a room. If nothing is moving, the waves bounce back just as they were sent out. But if something moves, like a person or a pet, the waves bounce back differently. When the motion detector notices this change, it knows that something is moving and tells the alarm to make a sound or turn on a light. That’s how motion detectors can tell when someone is moving around in a room!
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