QTR-3RC Reflectance Sensor Array

Pololu item #: 2457 199 in stock
Brand: Pololu
Status: Active and Preferred 
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Price break Unit price (US$)
1 4.95
5 4.25
25 3.75
100 3.49


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This compact module packs three IR LED/phototransistor pairs onto a 1.25″ × 0.3″ board. The sensors are mounted on a 0.375″ pitch, allowing this array to be used as a minimal detector for a line-following robot. Each sensor provides a separate digital I/O-measurable voltage output.

 Description Specs (3) Pictures (7) Resources (11) FAQs (0) On the blog (8) 
  • Amanda's line following robot: Newbie

    Amanda's line following robot: Newbie

    by Amanda - 5 June 2015

    Many of the engineers and robot enthusiasts here at Pololu competed in the LVBots 2015 line following competition. (For house rules and details...

  • Jon's line following robot: Usain Volt 2.0

    Jon's line following robot: Usain Volt 2.0

    by Jon - 4 May 2015

    Like other developers and engineers here, I made a robot for the LVBots Line Following Contest. This post describes my robot, Usain Volt 2.0, and...

  • David's line following robot that learns the course

    David's line following robot that learns the course

    by David - 1 May 2015

    Several people here made robots to compete in the recent LVBots line following competition. The goal of the competition is to make an autonomous...

  • Jamee's dead reckoning robot

    Jamee's dead reckoning robot

    by Jamee - 30 April 2014

    Several Pololu employees made robots for the LVBots dead reckoning competition. Unfortunately, my robot didn’t work enough in time for the...

  • Jon's dead reckoning robot

    Jon's dead reckoning robot

    by Jon - 10 April 2014

    Like other engineers here, I made a robot for the LVBots dead reckoning competition. Before I knew about this competition, I hadn’t made a...

  • R2-DR, Kevin's dead reckoning robot

    R2-DR, Kevin's dead reckoning robot

    by Kevin - 26 March 2014

    When I first started planning a robot for the recent LVBots dead reckoning competition, it was more or less a conventional design—a flat chassis...

  • Brandon's dead reckoning robot

    Brandon's dead reckoning robot

    by Brandon - 25 March 2014

    For the recent LVBots dead reckoning competition that was hosted here at Pololu, I decided to make a robot based on the Baby Orangutan robot...

  • David and Fang's dead reckoning robot based on the mbed LPC1768

    David and Fang's dead reckoning robot based on the mbed LPC1768

    by David - 14 March 2014

    Several people here at Pololu made robots to compete in the LVBots dead reckoning competition last week. This post is about the robot I made along...

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