Controlling a DC motor using Arduino ADK, Darlington Transistor, Android App

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My first Android/Arduino integration project using Arduino ADK board, Darlington Transistor and Nexus 7 tablet.
Motor salvaged from inkjet printer.

Android App detects touch screen interaction and records Y value. Sends value to Arduino using ADB server. Arduino maps Y value to AnalogWrite on Pin that regulates speed of motor through Transistor.

Online Resources that helped me figure this out:

Android/Arduino integration:

Controlling a DC Motor with a TIP 120(Darlington) Transistor

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