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April 19, 2011 AT 12:00 am

TUTORIAL TUESDAY! Converting an Arduino to 3.3V

Fetch-5

TUTORIAL TUESDAY! Converting an Arduino to 3.3V – All official Arduinos run on 5 volts, which for a long time was the ‘standard’ voltage for hobbyist electronics and microcontrollers. But now the coolest new sensors, displays and chips are 3.3V and are not 5V compatible. For example, XBee radios, and SD cards and acellerometers all run on 3.3V logic and power. If you tried to connect to them with 5V you could damage the internals of the accessory. We use chips like the CD4050 to do level conversion but if you are using a lot of 3.3V devices, maybe you’re just better off upgrading the entire Arduino to run from 3.3V! To do that, we will replace the regulator so that the DC barrel jack for a 3.3v type, and then reconfigure the 5V usb power line so it goes through the regulator as well.

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7 Comments

  1. Jan D Schuitemaker

    It would have been nice if we could switch between 5 and 3.3V. Anyone has a good tutorial for that?

  2. Do you have to change something in the code?
    Because the datasheet says:
    0 – 10 [email protected] – 5.5.V
    0 – 20 [email protected] – 5.5V
    and 16Mhz is somewhere in between… Will it be stable?

  3. Neat! It would be nice if the standard arduino had this feature

  4. uhe, read the end of the article
    scarf, it is 2.7v

  5. It should be accelerometers (not acellerometers )

  6. scharf, for arduinos (which is what this tutorial is for) it is set to 2.7v

  7. ladyada: presumably that’s not necessarily true for Arduino clones, or Arduinos that have been upgraded from the Atmega168 to Atmega328 post-purchase. Admittedly, it should be if the bootloader was burned correctly, but still…

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