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Adafruit IR Break Beam Sensor - 5mm LEDs [ADA2168]
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Adafruit IR Break Beam Sensor - 5mm LEDs Features
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Simple way to detect motion
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Faster than PIR sensors and allow better control of where you want to detect the motion
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Works up to 20 inches
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Open collector transistor output receiver
About Adafruit IR Break Beam Sensor - 5mm LEDs
Infrared (IR) break-beam sensors are a simple way to detect motion. They work by having an emitter side that sends out a beam of human-invisible IR light, then a receiver across the way which is sensitive to that same light. When something passes between the two, and its not transparent to IR, then the 'beam is broken' and the receiver will let you know.
