QTR-1RC Reflectance Sensor
The QTR-1RC reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following. The output is designed to be measured by a digital I/O line.
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QTR-1RC and QTR-L-1RC reflectance sensor schematic diagram.
QTR-1A reflectance sensor on a quarter for size reference.
QTR-L-1RC reflectance sensor on a quarter next to a QTR-1A reflectance sensor.
An example of soldering header pins parallel to QTR-1A PCB for compact installation.
QTR-1RC output (yellow) when 1/8" above a white surface and microcontroller timing of that output (blue).
QTR-1RC output (yellow) when 1/8" above a black line and microcontroller timing of that output (blue).
QTR sensor size comparison. Clockwise from top left: QTR-3RC, QTR-1RC, QTR-L-1RC, QTR-8RC.