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This QRE1113 breakout board features an easy to use analog output, which will vary depending on the amount of IR light reflected back to the sensor.
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It is perfect for line sensing applications and can be used in both 3.3V and 5V systems: the QRE1113 have an IR emitting LED and an IR sensitive phototransistor. The IR LED inside the sensor will illuminate when you apply power to the VCC and GND pins. The more IR light sensed by the phototransistor, the lower the output voltage of the breakout board.