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I would not recommend changing Arduino powering. You can either do as you say and power Arduino by giving it regulated 5V to Vin, but then the ATMEGA2560 still will be powered through the 5V voltage regulator. The voltage regulator (NCP1117ST50T3G) needs to be supplied with 6.5V to give out regulated 5V. So you will be powering the Arduino with some 4V, ...


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