TCRT5000 Photo Interrupter

SENTCRT500
€1.50
Photo-interrupter to sense when an object is close (if read as digital), and how close it is (if read as analog), in very near range.

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The concept is quite simple: the photointerrupter sends IR light, and receives it. If an object is near it will reflect the light.

For more information, please read the datasheet
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