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Getting Started with Arduino – Beginner's Tutorial to Open-Source Hardware Prototyping with Arduino Uno - CIRCUITSTATE Electronics
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The Basics of Arduino: Reading Switch States
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Accessing I/O in ATmega328P (Arduino) using Assembly and C - Hackster.io
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serial - Reading states of multiple toggle switches - Arduino Stack Exchange
Digital Input -How to use the button with Arduino. - Robo India || Tutorials || Learn Arduino || Robotics
