QTR-1A Infra Red Analog Reflectance Sensor

Pololu QTR-1A Infra Red Analog Reflectance Sensor
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Modèle : QTR-1A
Fabricant : Pololu
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Pololu

QTR-1A Infra Red Analog Reflectance Sensor

The QTR-1A infra red reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following applications. The reflectance measurement is output as an analog voltage.

For a digital output version of this sensor see the QTR-1RC

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.

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

Specifications

  • 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)

Interfacing the QTR-1A Output to a Digital I/O Line

There are several ways you can interface with the QTR-1A output:

  • Use a microcontroller’s analog-to-digital converter (ADC) to measure the voltage.
  • Use a comparator with an adjustable threshold to convert the analog voltage into a digital (i.e. black/white) signal that can be read by the digital I/O line of a microcontroller.
  • Connect the output directly to the digital I/O line of a microcontroller and rely upon its internal comparator.

This last method will work if you are able to get high reflectance from your white surface, but will probably fail if you have a lower-reflectance signal.

To make your programming life easier, Pololu have made library functions for the Arduino and AVR, and sample code is available below.

Our Pololu AVR library provides functions that make it easy to use these sensors with our Orangutan robot controllers and other AVR-based controller boards such as Arduinos. Please see section 11 of our library command reference for more information.

Documents

Pololu QTR Reflectance Sensor Application Note
Arduino Library for the Pololu QTR Reflectance Sensors
Building Line Following and Line Maze Courses

 

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QTR-1A Infra Red Analog Reflectance Sensor
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QTR-1A Infra Red Analog Reflectance Sensor
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