QTR-L-1A Reflectance Sensor (2-Pack)
The QTR-L-1A reflectance sensor incorporates a right-angle infrared LED and a right-angle phototransistor in an inexpensive, tiny 0.35″ × 0.3″ module that can be mounted almost anywhere and is great for edge detection and line following. The reflectance measurement is output as an analog voltage. This sensor is sold in packs of two units.
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QTR-L-1A reflectance sensor schematic diagram.
QTR-L-1RC reflectance sensor on a quarter next to a QTR-1A reflectance sensor.
QTR-L-1A reflectance sensor emitter and detector sides with labeled pinout.
QTR-L-1A or QTR-L-1RC reflectance sensor (2-pack) with included header pins.
QTR-L-1A and QTR-L-1RC reflectance sensors plugged into a breadboard in two possible orientations.