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![4. Serial Communications - Arduino Cookbook [Book]](https://www.oreilly.com/library/view/arduino-cookbook/9781449399368/httpatomoreillycomsourceoreillyimages798445.png "4. Serial Communications - Arduino Cookbook [Book]")
4. Serial Communications - Arduino Cookbook [Book]
Multiple Push Buttons on One Arduino Input - The DIY Life
Multi-tasking the Arduino - Part 1
Using an Arduino's Digital I/O
Arduino Uno Pins - A Complete Practical Guide - The Robotics Back-End
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