Stupid Arduino Powering Question

Discussion in 'Embedded Systems and Microcontrollers' started by crazyengineer, Mar 15, 2012.

  1. crazyengineer

    Thread Starter Member

    Dec 29, 2010
    For my engineering project, I'm thinking about powering the arduino through 3 AA batteries. Is it possible to power the Arduino using 4.5V?
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    Which arduino do you have? Will you use the USB interface during battery operation?
  3. vpoko

    Active Member

    Jan 5, 2012
    Most Arduinos require a minimum of 6V input (7V recommended) that's regulated to the logic level of 5V. A few Arduinos, like the Pro Mini, have 3.3V versions and require a minimum of input voltage of 3.35V.
  4. be80be

    AAC Fanatic!

    Jul 5, 2008
    If you read the data sheet for the uno it can use both 3.3 or 5 volts and it has blocking diodes to keep you from back feeding the usb and the regulator.

    You can pull the chip and use it at 4.5 volts leave it in the uno board and use a wall wart you need 7 to 12 volts but it will work with 6 to 20 volts but they want you to use 7 to 12volts

    If I wanted to use it at 4.5 I would buy a ATMEGA328-PU and program the bootloader on it and use it in my project.
    Last edited: Mar 15, 2012
  5. vpoko

    Active Member

    Jan 5, 2012
    Where are you seeing this? I'm looking at the specs and see 6V minimum input voltage.