Developer boards now allow end users to realise complex circuits in the smallest of spaces, but Itaca Innovations is taking space-saving to the next level with the uChip, which is just 28.5 x 10.6 mm. The Arduino Zero compatible board is no bigger than a large coin and is currently being funded on crowdfunding website Kickstarter. ITACA estimates to ship the uChip from June this year for early-bird backers.
https://www.notebookcheck.net/uChip-An-ultra-compact-Arduino-Zero-compatible-board-that-costs-just-EUR20-US-22-45-pound17-15.413852.0.html
While this Kickstarter campaign did not reach its goal it did have over 20K in pledges, pretty impressive.
Itaca went ahead and now sells this device on their website
Itaca website
But you do have another opportunity to get this through Kickstarter. We are bundling this device with our BASIC compiler for ARMs.
kickstarter basic-compiler-for-arduino-zero-boards