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Specifications:

  • It's a 100% Arduino pro micro Compatible Board.
  • Chip: ATmega32u4
  • Board Mode: LEDNARDO R3
  • Operating frequency: 16MHz
  • Working voltage: 5V
  • Input voltage: 7-12V
  • Digital IO port: 20
  • PWM channel: 7
  • Analog input: 12
  • Maximum current of 5V digital/analog port: 40mA
  • Maximum current of 3.3 V digital/analog port: 50 mA

What do I feed the Arduino Uno? 7-12V or 5V?

enter image description here

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    \$\begingroup\$ Feed it with what you like. 7-12 V through the regulator input, or 5 V through the 5 V input. \$\endgroup\$
    – Neil_UK
    Oct 17, 2021 at 13:25
  • \$\begingroup\$ Downvoting and voting to close a beginners question. What a warm welcome they get on ee.se \$\endgroup\$
    – Passerby
    Oct 18, 2021 at 16:01
  • \$\begingroup\$ @Neil_UK I still wouldn't feed it with unregulated 5v though 5v pin, instead I'd do 5v though Vin or even 12v through the same pin. Then again, I really only use USB, I don't deal much with the care and feeding of Arduinos. \$\endgroup\$
    – Proxy303
    Oct 18, 2021 at 19:40

2 Answers 2

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You can supply it either with

  • 5V via USB
  • 7-12V via the barrel jack, or
  • 7-12V via the Vin pin

According to this source (first google result for "arduino how supply voltage").

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The working voltage is meant to tell you what the regulator outputs and what the electronics works at (such as the MCU). That in turn helps you know what the I/O voltage levels are. It also means that if there is a power pin that bypasses the regulator to feed the logic directly, then it needs to be a good, steady, clean 5V.

The input voltage of 7-12V would be through the regulator.

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