What is an Arduino? - learn.sparkfun.com
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Arduino Tip : Turn your Analog pins into Digital I/O
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Tutorial: Using analog input for multiple buttons | tronixstuff.com
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Arduino use Analog pins as Digital pin - YouTube
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How To Use Arduino's Analog and Digital Input/Output (I/O) - Projects
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Can we use analog pins of Arduino as digital ones? If so, how? - Quora
