Arduino pinMode() Function & INPUT_PULLUP Explained
![Amazon.com: Arduino Leonardo with Headers [A000057] : Electronics](https://m.media-amazon.com/images/I/71KGGTNpcQL._AC_UF894,1000_QL80_.jpg "Amazon.com: Arduino Leonardo with Headers [A000057] : Electronics")
Amazon.com: Arduino Leonardo with Headers [A000057] : Electronics
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Basic switch and input_pullup blew my pins? - General Electronics - Arduino Forum
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Increase Digital Pins of Your Arduino Using the 74HC595 (IOExtension Module With Arduino Library) : 5 Steps - Instructables
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Arduino Input and Output Pins | Starting Electronics
Using Arduino Analog Pins As Digital Output Input Pins
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How To Use Arduino's Analog and Digital Input/Output (I/O) - Projects
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