QTR-3A Reflectance Sensor Array

QTR-3A Reflectance Sensor Array
Pololu item #: 2456 292 in stock

Price break Unit price (US$)
1 4.95
5 4.25
25 3.75
100 3.49


backorders allowed

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, making this array a great minimal sensing solution for a line-following robot. Each sensor provides a separate analog voltage output.

 Description Specs (3) Pictures (7) Resources (7) FAQs (0) On the blog (2) 

Documentation and other information

Pololu QTR Reflectance Sensor Application Note (Printable PDF: QTR_application_note.pdf)

Information about using the Pololu QTR-xA and QTR-xRC reflectance sensors, including sample oscilloscope screen captures of sensor outputs.

Pololu AVR C/C++ Library User’s Guide (Printable PDF: pololu_avr_library.pdf)

Information about installing and using the C/C++ libraries provided for use with Pololu products.

Arduino Library for the Pololu QTR Reflectance Sensors (Printable PDF: QTR_arduino_library.pdf)

This guide explains how to use the QTRSensors library to read Pololu QTR sensors and QTR sensor arrays with the Arduino.

Pololu AVR Library Command Reference (Printable PDF: avr_library_commands.pdf)

A reference to commands provided in the Pololu C/C++ and Arduino libraries for the AVR.

Building Line Following and Line Maze Courses (Printable PDF: building_line_courses.pdf)

Step-by-step instructions for building your own line-following courses.


File downloads

QTR-3A reflectance sensor array schematic diagram (115k pdf)
Printable schematic diagram for the QTR-3A reflectance sensor array.
Datasheet for the Sharp GP2S60 compact reflective photointerrupter (164k pdf)
Datasheet for the sensor used on the QTR-3RC and QTR-3A Reflectance Sensor Arrays and on the Optical Encoders for micro metal gearmotors.