A Arduino library for reflective sensors - and arrays of reflective sensors - i.e. good for detecting moving objects and edges of moving objects.

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 and QTR-1RC) or as 8-sensor arrays (QTR-8A and QTR-8RC) 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).

[From Pololu - Arduino Library for the Pololu QTR Reflectance Sensors ]

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