QTR-1A Reflectance Sensor
The QTR-1A 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 reflectance measurement is output as an analog voltage.
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QTR-1A 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-1A output 1/8" away from a spinning white disk with a black line on it.
QTR-1A output 3/8" away from a spinning white disk with a black line on it.
QTR sensor size comparison. Clockwise from top left: QTR-3RC, QTR-1RC, QTR-L-1RC, QTR-8RC.