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IR Reflectance Sensor Board, QRE1113GR, Digital Output US$1.50

IR Reflectance Sensor Board, QRE1113GR, Digital Output

This QRE1113 breakout board features a digital output, using a capacitor discharge circuit to measure the amount of reflection. This tiny board is perfect for line sensing when only digital I/O is available.

The board's QRE1113 IR reflectance sensor is comprised of two parts: an IR-emitting LED and an IR-sensitive phototransistor. When you apply power to the VCC and GND pins, the IR LED inside the sensor will illuminate. A 100Ω resistor is on board and placed in series with the LED to limit current. The output of the phototransistor is tied to a 10nF capacitor. The more reflective the surface is, the faster that capacitor discharges.

These sensors are used widely in line-following robots. White surfaces reflect much more light than black, so, when directed toward a white surface, the capacitor will discharge faster than it would when pointed toward a black surface.

The power input and analog output pins are brought out to a 3-pin, 0.1"-pitch header. The board also has a single mounting hole.

The board measures 0.30 0.55 inches (7.62 13.97 mm).

There also is a simple analog-output version of this board.

IR Sensor Board Features

  • 5V DC operating voltage
  • 25mA supply current
  • Digital I/O compatible
  • No ADC required
  • Optimal sensing distance: 0.125" (3mm)

IR Sensor Board Resources

Optional Recommended Products for this Item
Rectangular Pin Header, Male, 1x40 Single Row, 2.54mm Spacing+ US$0.75
Pack of 12 Prototyping Wires for 0.025-inch Square Pins+ US$5.00

This product was added to our catalog on Tuesday 20 December, 2011.


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