by Sutajio Kosagi

An ARM board that fits inside your USB connector

View all updates May 04, 2018

Shipping Begins Soon - Update Your Address!

Hi backers. It’s been a while, but we’ve got some very good news: Production on Tomu has finished, and we’re getting ready to ship! If your address has changed since you backed Tomu, make sure to log into your Crowd Supply account and change it, because we’ll start shipping Tomu boards very soon.

Tomu will come with the DFU bootloader pre-installed. The version that we are shipping with units is v2.0-rc4, which supports applications written specifically for Tomu’s DFU Bootloader. To develop software for Tomu, we recommend you update to at least v2.0-rc5. We have written steps for updating Tomu, which are good to understand because updating the Tomu bootloader is the same process as uploading any other program to Tomu, so it’s a good idea to have the tools set up already.

Your Tomu will come with a plastic case in the bag which you can assemble yourself. Thanks to a suggestion from the factory, these cases include a pair of clips to keep Tomu from popping out on its own. Because the clips will deform if you try to pry the case open, you can use their integrity to determine if someone has tampered with your Tomu to access the debug pads. Your Tomu will come disassembled in case you want to hack on it with a debug tool before putting it in a case.

Finally, both Tim "mithro" Ansell and Sean "xobs" Cross will be at Crowd Supply in Portland between 11 and 13 May for their Teardown event. If you’re in the area, come and say Hi!

$86,595 raised

of $100 goal

86,595% Funded! Order Below

Product Choices



A computer in your USB port! One Tomu board with two buttons, two LEDs, and a 25 MHz CPU, all fully assembled and tested.


Sutajio Kosagi

Sutajio Ko-usagi supports and produces open hardware products designed by bunnie and xobs.

Tim Ansell


Sean Cross


OSH Park

Prototype PCB Manufacturer

See Also

Subscribe to the Crowd Supply newsletter, highlighting the latest creators and projects: