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Yet, provided that you do not exceed 5.5 volts on the +5v pin, you can absolutely use it to supply the arduino. You bear the responsibility of ensuring that you do not exceed 6v though.
– David Hoelzer
Commented Nov 26, 2015 at 14:34
1

I am still wondering how the USB power fits into this. Does the USB power bypass the regulator? I think it must otherwise there is too much of a voltage drop. So is powering the Arduino through the +5V pin the same as powering by USB? And does powering it through the +5V pin still also give the +3.3V?
– tcurdt
Commented Dec 19, 2020 at 20:31
you can input power into an arduino, up to 20 volt, via vin pin.
– clockw0rk
Commented Sep 20, 2021 at 19:36

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