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What are the 5V and VIN pins for? - Arduino Stack Exchange
How to use digital pin as ground? - arduino nano
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What pins can be used for chip select (CS, CC) on the Arduino …
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Max current of Vin and 5V pin on Arduino Nano
Arduino Nano PWM frequency - Arduino Stack Exchange
Use all pins As digital I/O - Arduino Stack Exchange
Using RST pin as external power switch - arduino nano