Getting started with Femtoduino – smallest Arduino

A couple months ago I was playing with my Arduino Uno and I was wondering, what is the smallest Arduino that I could find these days? So fast forward, I am holding Femtoduino, smallest Arduino that I was able to find without braking my budget.

What is Femtoduino?

It is VERY small Arduino compatible board that has same processing capability and pin count as an Arduino Uno.

Here are the specs from Femtoduino’s website :

  1. Femtoduino is an ultrasmall libre Arduino compatible board.
  2. ATMEGA 328p (QFN32 version) Processor
  3. exact same computing power of the Arduino Duemilanove or UNO.
  4. ultra light (2g)
  5. ultrasmall (20.7×15.2 mm) (.81″  x .6″)
  6. 0.05″ connectors
  7. 0402 components
  8. removing everything not strictly necessary

Wondering what the PIN layout is ?

Check out the picture below

Femtoduino is easy to program, you can use your existing Arduino to act as the programmer or you can use FTDI board to program it directly from Arduino software. I use the micro FTDI board from Tindie :

Download the drivers for the FTDI board here:

And here is the instructions that I followed to connect it to my computer :

To connect the Femtoduino to the FTDI board I used a basic jumper wire  that was cleverly inserted into the Femtoduino from both sides to be held securely. This way I can even prototype on the Femtoduino and breadboard without using a shield!

What’s the price of a Femtoduino?

Femtoduino costs 25$ plus shipping.

You can purchase it from the manufacturer :

Or from :

Feel free to ask me questions about this, I have 3 of these little boards that I will be using in my projects!

Have fun making micro electronics projects!

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  • Èric July 23, 2013  

    Youtube Link:
    A super small 18g Tricopter with Femtoduino.
    Regards, Èric

  • Èric August 23, 2013  

    Femto(duino) Tricopter 20g, PID Tuning:
    Femto(duino) Tricopter 20g, Outdoor Flight:
    Regards, Èric

  • jenifer desoza September 26, 2013  

    smallest Arduino
    you made such a wonderful think.

  • ivan February 20, 2014  

    RFduino looks smaller, built-in Bluetooth 4.0, and less expensive!

  • Maks Surguy February 20, 2014  

    yeah but the only problem is that it’s not out for general population yet. While with femtoduino you could order that right now

  • Joe Bloggs April 13, 2016  

    You can buy femtoduinos off my store on tindie for $11 as of April 2016:
    Each board is assembled and rigorously tested in the UK.

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