L2: Blinking an LED - Physical Computing
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Understanding HIGH and LOW Arduino Pin States :: Open Source Hardware Group Arduino Tutorials - YouTube
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The Basics of Arduino: Reading Switch States
Accessing I/O in ATmega328P (Arduino) using Assembly and C - Hackster.io
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electronics - How to check if all pins are connected on my board to make sure Arduino sends the correct pattern number on my tool - Arduino Stack Exchange
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The Basics of Arduino: Reading Switch States
