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Powering up via 5V I/O 4. Using batteries greater than 5V connected in... | Download Scientific Diagram
Is there any way to have an Arduino Uno pin output 3.3V instead of 5V when it is high (looking for a non PWM solution)? - Quora
What is the easiest way to power an Arduino Nano from a battery (preferably using the 5V micro USB jack)? - Quora
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