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I have an Arduino Uno. It has a 3.3v pin that I would like to use to power another module that requires 3.3v, and nothing more. If I power my Arduino Uno with a 9 volt battery, will this pin output 3.3v, or will it give more than that?

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    It will output 3.3V. What module do you want to power ? A sensor uses very little current, that won't be a problem.
    – Jot
    Oct 26, 2017 at 1:08
  • I am using an IMU sensor and an NRF radio. They both run on 3.3v.
    – Trevin Avery
    Oct 26, 2017 at 4:16
  • A (fake) nRF24L01+ ? I think they require not a large amount of current (only 10mA or 20mA or so), but I'm not sure. I will probably work.
    – Jot
    Oct 27, 2017 at 10:41

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The 3.3v is regulated and will always output 3.3v if the device is powered on.

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