QTR-L-1A Infrared Reflectance Sensor (2-Pack)

Functional Description

The Pololu QTR-L-1A reflectance sensor carries a right-angle infrared LED and a right-angle phototransistor, both pointing toward the front edge of the board. The phototransistor is connected to a pull-up resistor to form a voltage divider that produces an analog voltage output between 0 V and VIN (which is typically 5 V) as a function of the reflected IR. Lower output voltage is an indication of greater reflection.

The LED current-limiting resistor is set to deliver approximately 17 mA to the LED when VIN is 5 V. The current requirement can be met by some microcontroller I/O lines, allowing the sensor to be powered up and down through an I/O line to conserve power.

This sensor was designed to be used with the board perpendicular to the surface being sensed, and narrow-angle lenses built into the infrared LED and phototransistor packages allow it to be effective to a range of about 1" (25 mm). Because of its small size, multiple units can easily be arranged to fit various applications such as line sensing and proximity/edge detection. The QTR-L-1A is sold in packs of two units.

QTR sensor size comparison. Top row: QTRX-HD-07, QTR-HD-07; middle row: QTR-3, QTR-1, QTR-L-1; bottom row: QTR-8.

Specifications

• Dimensions: 0.3" x 0.35" x 0.12" (without optional header pins installed)

• Operating voltage: 5.0 V

• Supply current: 17 mA

• Output format: analog voltage

• Output voltage range: 0 to supplied voltage (dependent on operating environment)

• Optimal sensing distance: 0.125" to 0.25" (3 mm to 6 mm)

• Maximum recommended sensing distance: 1" (25 mm)

• Weight without header pins: 0.006 oz (0.2 g)