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QTR-1A Reflectance Sensor

JS-3879

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The Pololu QTR-1A reflectance sensor carries a single infrared LED and phototransistor pair. 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.
Do you need modifications to this product or need it on a custom circuit board? We can design and manufacture circuit boards to your specs for any project. Get in touch with us now through our Circuit Board Design or Circuit Board Assembly pages. In a rush? No problem, we get it done in as soon as 24 hours.

Availability: In stock

$2.49
Pricing:
$2.49 (10+) $2.24 (25+) $2.12
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Description:
The Pololu QTR-1A reflectance sensor carries a single infrared LED and phototransistor pair. 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 20-25 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.

Check out this awesome tutorial using an Arduino.

Features:

  • Dimensions: 0.3" x 0.5" x 0.1" (without header pins installed)
  • Operating voltage: 5.0 V
  • Supply current: 25 mA
  • Output format: analog voltage
  • Output voltage range: 0  to supplied voltage
  • Optimal sensing distance: 0.125" (3 mm)
  • Maximum recommended sensing distance: 0.25" (6 mm)
  • Weight without header pins: 0.008 oz (0.23 g)

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