
Fabio Varesano has designed what is probably the smallest Arduino compatible board. He states:
By using the QFN32 version of the ATMEGA 328p, 0.05″ connectors, 0402 components and removing everything not strictly necessary, I’ve been able to design and hand build an Arduino compatible board which is very small (20.7×15.2 mm) and ultra light (2g) but has exactly the same computing power of the Arduino Duemilanove or UNO.
Femtoduino is a true open source project, with schematic and Gerber files provided and released under CC-BY-SA 3.0 Unported. It was been designed using Kicad, a libre PCB design software.
Via Arduino blog.

Does it comes with free pair of glasses? :)
Nice minimalistic design!
It’s still a crapduino, but that’s really cute. You cna probably just use it as a real AVR instead.
These are officially sold at Femtoduino.com, in case anyone is interested in buying a few of these.
A bit odd that the Femtoduino site ‘About’ Page mentions two people, neither of which is Fabio Varesano.
A nice presentation recently posted on YouTube …The Femtoduino looks interesting too ;)
https://www.youtube.com/watch?v=tXd12wSIak0
Hi Sleepwalker3,
Fabio Varesano isn’t listed on there since it may be construed as being in poor taste by others (freinds, family, etc). Of course, we do attribute to Fabio as the original author of the Femtoduino (and worked with him to promote the Femtoduino. See http://www.varesano.net/blog/fabio/femtoduino-sale )
– The Femtoduino team
OK, I was not aware of his passing, that is sad and my condolences to his family and friends. Personally I feel that’s all the more reason to promote him as the original designer, as a tribute. You would likely know a lot more than me about his family and friends thoughts about it, but I would have thought most would want to celebrate his great achievements – for example, I had no idea other than the original article done on DP a couple of years back.
You can buy femtoduinos off my store on tindie as of April 2016:
https://www.tindie.com/products/UK_Open_shed/femtoduino/
Each board is assembled and rigorously tested in the UK.