Qtr Arduino Library

Topics: Personal identification number, Control theory, PID controller, Sensor, Control engineering, Metrology / Pages: 17 (4111 words) / Published: Jun 16th, 2012
Arduino Library for the Pololu QTR Reflectance Sensors

© 2001–2011 Pololu Corporation

Arduino Library for the Pololu QTR Reflectance Sensors

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Library Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. QTRSensors Methods & Usage Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

http://www.pololu.com/docs/0J19

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Arduino Library for the Pololu QTR Reflectance Sensors

© 2001–2011 Pololu Corporation

1. Introduction

QTR-1RC reflectance sensor.

QTR-8A reflectance sensor array.

The Pololu QTR reflectance sensors carry infrared LED and phototransistor pairs that can provide analog measurements of IR reflectance, which makes them great for close-proximity edge detection and line-following applications. The modules come as compact, single-sensor units (QTR-1A [http://www.pololu.com/catalog/product/958] and QTR-1RC [http://www.pololu.com/catalog/product/959]) or as 8-sensor arrays (QTR-8A [http://www.pololu.com/catalog/product/960] and QTR-8RC [http://www.pololu.com/catalog/product/961]) that can be optionally split into a 2-sensor array and a 6-sensor array. The modules are available in two different output formats: the QTR-xA outputs an analog voltage between 0 and Vcc that can be measured by an analog-to-digital converter (ADC), and the QTR-xRC outputs a pulse that can be measured by a digital I/O line (the duration of which provides an analog measurement of reflectance).

QTR-1A reflectance sensor schematic diagram.

QTR-1RC reflectance sensor schematic diagram.

Please see the product pages [http://www.pololu.com/catalog/category/7] for more information on how these sensors work. This document will explain how to install Arduino libraries for the Pololu QTR reflectance sensors, and

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