QTR-3A Reflectance Sensor Array

Pololu item #: 2456 299 in stock
Brand: Pololu
Status: Active and Preferred 
RoHS 3 compliant
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 

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 (11) FAQs (0) On the blog (2) 

Documentation and other information

Pololu QTR Reflectance Sensor Application Note (Printable PDF)

Information about using the Pololu QTR reflectance sensors, including differences between A-type and RC-type sensors and sample oscilloscope screen captures of sensor outputs.

Pololu AVR C/C++ Library User’s Guide (Printable PDF)

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

Pololu AVR Library Command Reference (Printable 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)

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, the Zumo 32U4 robot front sensor array, and the Optical Encoders for micro metal gearmotors.
Dimension diagram of the QTR-3x Reflectance Sensor Array (130k pdf)
3D model of the QTR-3A Reflectance Sensor Array (3MB step)
Guide utilisateur du senseur QTR (suiveur de ligne) (1MB pdf)
Un guide utiliser et exploiter un senseur QTR (détecteur de ligne) (version 0.1). Note: This French translation of our QTR sensor documentation was made by our distributor MCHobby.

Related Products

QTR-3RC Reflectance Sensor Array
QTR-8A Reflectance Sensor Array
QTR-8RC Reflectance Sensor Array
QTR-1A Reflectance Sensor (2-Pack)
QTR-L-1A Reflectance Sensor (2-Pack)
QTR-L-1RC Reflectance Sensor (2-Pack)
QTR-1RC Reflectance Sensor (2-Pack)
Pololu 3pi Robot

Related Categories

Older QTR Sensors
Sensors
Sharp Distance Sensors
Sonar Range Finders
Premium Jumper Wires
Wires with Pre-Crimped Terminals
Log In
Pololu Robotics & Electronics
Shopping cart
(702) 262-6648
Same-day shipping, worldwide
Menu
Shop Blog Forum Support
My account Comments or questions? About Pololu Contact Ordering information Distributors