Here is a brief overview of the TCRT5000 Reflective infrared sensor. I'll cover how it works and show you an example circuit and code for you to use yourself

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List of items used in this project and where to find them:

TCRT5000 break out board: http://geni.us/TCRT5000

Arduino Uno: http://geni.us/ArduinoUno

Jumper Wires: http://geni.us/JumperWires

Breadboard: http://geni.us/MiniBreadboard

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The code can be downloaded from here: https://github.com/DIY-Machines/TCRT5000