How much current does the arduino uno need? Keep in mind that none of the voltage pins will be used ( 5V nor 3.3V ), except for 3 pins for data. All other electronics will have their own power supply.

Arduino current

system January 9, 2013, 4:07pm 3

20ma is a good estimate, probably towards the upper end. 5ma is about right.

If you consume materially more than that, there likely is something wrong.

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