Arduino library for the Pololu QTR reflectance sensors

Arduino library for the Pololu QTR Reflectance Sensors

Version: 3.0.0
Release date: 2016-08-16
Build Status


This is a library for an Arduino-compatible controller that interfaces with the Pololu QTR reflectance sensors.

For documentation, please see the user's guide for the library on Pololu's website.

Version history

  • 3.0.0 (2016-08-16): Updated library to work with the Arduino Library Manager.
  • 2.1.2 (2015-12-03): Corrected readLine() behavior to work with multiple instances (thanks to Tandy Carmichael).
  • 2.1.1 (2014-05-02): Minor improvements to read() behavior and whitespace cleanup.
  • 2.1.0 (2013-04-18): Improved existing examples and added two new examples for printing raw values.
  • 2.0.2 (2013-04-17): Made constructors initialize pointers to avoid possible problems.
  • 2.0.1 (2012-09-13): Added a 200 us delay after emitter state changes to ensure sensors do not start being sampled before the LEDs turn on/off.
  • 2.0.0 (2012-02-14): Initial release of library on GitHub (with Arduino 1.0 compatibility).