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Adafruit STEMMA Reflective Photo Interrupt Sensor - TCRT1000

Adafruit STEMMA Reflective Photo Interrupt Sensor - TCRT1000

Pimoroni

£4.13

Price read from Pimoroni on 2026-10-22. Check before buying.

An optical reflective sensor is a composite electronic device with two elements - an IR LED and an IR photo-transistor. The IR LED blasts light, and when something bounces the light back to the photo-transistor, the transistor turns on and the amount of current flowing through it increases. This makes the sensor great at detecting when something is in front of the sensor: when nothing is there the IR light never gets reflected back and the transistor stays off. We have two versions of this sensor that are 'breadboard' friendly, the ITR20001 and a chunky all-in-one Infrared Reflective Sensor ,

Pimoroni's own words, read from their page.

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The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.