Hands on with the super tiny arudino: FemtoDuino


We originally heard about the FemtoDuino last year. It looked good enough and tiny enough, but we didn’t really have a need for it. Recently though, we started on a new project (which you can follow on the forums!) which required an easy modification to an existing circuit. Space and weight were quite important so we decided to pick up a couple femtoduinos at $25 each, and give them a try.

These things are tiny. Their foot print is 20.7×15.2mm. You can see in the picture below, with a quarter for reference. Tiny. Frankly, there’s not much to say about them. They’re an Atmega328 that is arduino compatible. I plan on using my redbull Arduino to program this thing, since you need to bring your own serial interface.

If you’re anything like me, you have atrociously sloppy soldering and shaky shaky hands. I was a bit concerned about actually getting those wires soldered in without bridging the pads. I was able to pull it off though.  Here’s a video so you can see how horrible my soldering technique and equipment are.

I really don’t have any complaints about this thing, it works just like an arduino but smaller. The closest thing to a complaint is that the silk screening is a bit blurry making it difficult to read which pins are what. It isn’t horrible, but it isn’t perfect either.  We really couldn’t think of much else so we decided a haiku would cover it.

one arduino
much smaller than a quarter

Of course, if you want to follow along and see if I end up with complaints, you can watch me build these battling star wars themed R/C cars.


  1. Mike Szczys says:

    Oh no, a firestick! Someone get this man a Hakko knock-off

    • nelsontb says:

      and a proper vise… aligator clips on pcb ewwwww. no wonder every smd solder job appears on HAD this guys don’t even have the basic material to do even pth soldering.

    • Tilman Baumann says:

      And look at the solder used.
      Last time I saw solder that thick it was used by a roofer!

      Seriously, go for the thinnest rosin core solder you can buy. You will never look back.

    • Alex says:

      What really bothered me was the way the tip moved in the “socket.” Agghhh.

      Years ago, after going through many cheap irons, I finally bought a temperature controlled soldering station. What an amazing piece of equipment. It’s difficult to explain just how wonderful it is to have proper tools.

  2. zaprodk says:


  3. John Jorsett says:

    I’ll be interested to see how the Femtoduino works out, as I’ve been considering it for a project. You might want to obtain a more delicate and temperature-controlled soldering iron for future work. That thing looks more suited to copper plumbing.

  4. tindiecom says:

    If you want to buy a Femtoduino, they are available on Tindie : https://tindie.com/shops/femtoduino/femtoduino-1/

  5. macegr says:

    RIP Fabio Verasano

  6. Ross says:

    sounds good for tiny quadcopters…

  7. meh says:

    Quarter the size with 5$ off…. $25 for this. I say the profit must be killer…

  8. Eddie says:

    WOW! That’s big quarter!

  9. andres says:

    why not use the teensyduino?

  10. BoinQ says:

    Arduino hack number 1000 on hackaday

  11. jpnorair says:

    Finer-pitch solder can help for those small holes, but what helps the most is some sort of board clamp that allows you to rest your hand. It doesn’t need to be professional. Binocular microscope a’int bad either. :)

  12. Can I recommend getting a soldering iron made after 1950? One with a long skinny tip? One of the orange Weller student irons with a replacement tip? (The default tip on the Weller is big enough to dig trenches with…)

    Otherwise, looks pretty cool.

  13. dave says:

    For less than the cost of two overpriced micro’s!


  14. Alex Albino says:

    May I suggest using soldering flux? I hand solder most of the board (including the ATMega328p-mu), but that’s only possible due to generous amounts of flux. It keeps the solder from sticking everywhere.

    • Arlet says:

      Or use good solder wire. I prefer Multicore Crystal 511. It’s got excellent wetting capabilities, and flows very nicely, even on somewhat dirty or corroded surfaces. Because of the halide additive, I recommend cleaning up the residue. For 99% of SMT work, I don’t use extra flux.

      • fartface says:

        Amen! Lots of “hackers” buy the cheapest junk solder they can find. Last spool of that stuff Cost me $40.00.. I hear a lot of guys at the Hackerspace whine that I’m out of my mind spending that kind of money on solder…

  15. Is there a spec sheet somewhere? What voltages does this run on?

  16. Stuzer Zender says:

    So this is what? ATmega’s breakout board+bonus parts for insane price? Buying this has nothing with hacking.

  17. marcus says:

    US$ 25 is good ..
    RMB 25 … that will be GREAT !!

  18. Leithoa says:

    Try the alertnative that’s 5 bucks cheaper and offers compatability with existing arduino shields.


  19. Ren says:

    What? has Pico-duino already been used?

    Oops! I guess it has…


    but I would expect something with the femto prefix to be a LOT smaller than something with a pico prefix.

  20. DragonPhyre says:

    Buy these. Don’t even question it, just buy ‘em. Never get made fun of your soldering iron again… At least not from people who aren’t just attached to brand names.




    This is the best iron for the price and that tip makes it just as good as anything else. Anybody who tells you anything different is just throwing out names like they mean anything other than you get a fancy box with a fancy set of instructions in it.

  21. defaultex says:

    I have shaky hands as well. What really helps is to rest your elbow on a pillow that is soft enough to tilt up and down easily while still providing a little support. Doesn’t eliminate the shakes entirely, but dampens it enough to do some pinpoint work.

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