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QTR-1RC Reflectance Sensor

Vendor's Description: 

The QTR-1RC reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following applications. The output is designed to be measured by a digital I/O line.

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To have some code samples here lol... :D
nothing for Picaxe :( oh well. will try the analog ones.