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A Guide to Arduino & the I2C Protocol (Two Wire) | Arduino Documentation | Arduino Documentation
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Controlling two solenoids - Motors, Mechanics, Power and CNC - Arduino Forum
L1: Using buttons - Physical Computing
Wired Communication Between Two Arduinos - Circuit Basics
The Basics of Arduino: Reading Switch States
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Arduino Button Tutorial Using Arduino DigitalRead Function - Arduino Project Hub
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Lab: Digital Input and Output with an Arduino – ITP Physical Computing
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Analog Write with 12 LEDs on an Arduino Mega | Arduino
2 limit switches wiring using same pin Arduino - YouTube
arduino - How to connect one pin to ground when an another analog pin is triggered - Electrical Engineering Stack Exchange
Using an Arduino's Digital I/O
