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You can either use the 3.3V pin to supply power to the board, or use the Vin pin. By using the VIN pin to power goes through a (step down) voltage regulator, that provides a nice stable 3.3V to the board. The regulator in the Nano 33 IoT is the MPM3610, which requires an input voltage of at least 4 - 4.5 Volt. Which is more that a LiPo or LiFePo single cell ...


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It would be best if everything ran at the same voltage. (And it is necessary that everything uses the same ground.) Which is possible as there are 5V Arduino boards. Interestingly, the Arduino nano, according to this schematic, runs at 5V. In order to use the Arduino Nano at 5V, instead of using VIN / Pin 1, you should be able to skip the Arduino's 5V ...


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