O'Bakas single-chip Arduino

All lovers of minimalist dedicated.
A certain citizen of Japanese nationality, in his project O'Baka, 0'baka Project "means a stupid project gathered Arduino the size of just a couple of centimeters on a single chip.
Moreover, programming is done via USB and no intermediate MK is needed.

The project is based on the idea of ​​the company Metalab which developed the project Metaboard - Arduino compatible board.

As they say: There is no limit to perfection.
Author's site
UPD .: ran to collect