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QTR-1RC Reflectance Sensor

JS-1521

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The Pololu QTR-1RC reflectance sensor carries a single infrared LED and phototransistor pair. The phototransistor uses a capacitor discharge circuit that allows a digital I/O line on a microcontroller to take an analog reading of reflected IR by measuring the discharge time of the capacitor.
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
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$2.49 (10+) $2.24 (25+) $2.12
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Description:
The Pololu QTR-1RC reflectance sensor carries a single infrared LED and phototransistor pair. The phototransistor uses a capacitor discharge circuit that allows a digital I/O line on a microcontroller to take an analog reading of reflected IR by measuring the discharge time of the capacitor. Shorter capacitor discharge time 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.

Due to its small size, multiple units can easily be arranged to fit various applications such as line sensing and proximity/edge detection.

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: digital I/O compatible
  • Optimal sensing distance: 0.125" (3 mm)
  • Maximum recommended sensing distance: 0.375" (9.5 mm)
  • Weight without header pins: 0.008 oz (0.23 g)

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