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QTR-1A Reflectance Sensor

Vendor's Description: 

The QTR-1A 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 reflectance measurement is output as an analog voltage.

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it would be nice to see some requirements data on this..

Think it said 5 volt supply in the app note on Pololu, but could probably work on 3.3 volts if that is what your micro uses, outputs an analog voltage so need an ADC to read.

THere is a QTR-1RC that has a digital output.