Tomu: An ARM board that fits inside your USB connector
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Tomu is a programmable computer that fits inside a USB port. It is
user-programmable, has two buttons and two LEDs, and can be used for
everything from a hobbyist device to a U2F security token.
Simple, Open, Flexible, EasyTomu is simple. It hides out in a USB port of your computer
and waits for you to use it. It has two LEDs to let you know what’s
going on, and two buttons for interaction. There’s no fancy setup or
complex user interface.
Tomu is open. You can download the hardware schematics, make your
own circuit board, and inspect how all the pieces work
together. You can download the software source code and trace programs
as they run. You can even load your own programs onto Tomu and have
it do exactly what you want.
Tomu is flexible. Maybe you want volume buttons on the side of
your laptop. You can load software onto Tomu that uses the two
buttons for Volume Up and Volume Down. Or maybe you want to be able
to put your computer to sleep or wake it up from a USB hub. With
Tomu, you can turn any USB port into an input device simply by
uploading new software to it.
Tomu is easy. It can be used as something called a Universal 2nd
Factor (U2F)
token. Many sites support two-factor authentication
(2FA) to
ensure you’re you, even if your password gets stolen. Two-factor
authentication options range from sending you an SMS to requiring you
use a one-time-password authenticator. U2F simplifies this process
by simply requiring you press a button on a specialized
device. With U2F software loaded, Tomu can act as that token.
Features & SpecificationsTomu fits entirely inside a standard USB Type-A slot, except for a
small area that pokes out to give you access to two buttons and two
status LEDs. It contains an ARM Cortex-M0+ CPU running at 25 MHz,
which can be reprogrammed without specialized hardware.
CPU: Silicon Labs Happy Gecko EFM32HG309
Speed: 25 MHz ARM Cortex-M0+
RAM: 8 KB
Storage: 64 KB Flash
Connectivity: USB 2.0 FS
Buttons: 2
LEDs: 2 (red + green)
Components: Literally 12 parts + PCB
ComparisonsThere are many U2F tokens available, each focusing on its own
selection of features. Most come with one button and one LED.
Tomu YubiKey NEOYubiKey NanoVASCO SecureClickFeitian ePass
NFCNo Yes No No Yes No
BluetoothNo No No Yes No No
Open sourceYes No No No No Yes
Fits in USB portYes No Yes No No No
Custom SoftwareYes No No No No Yes
Number of Buttons2 1 1 1 1 1
Number of LEDs2 1 1 1 1 1
CommunityThe Tomu project is developed in the open and driven by its
community. Check out these resources if you’re interested in
contributing or being part of the discussion:
Announcement mailing list: a low-traffic list for announcements
Discussion mailing list: a list for discussing development, new features, etc.
IRC Channel - irc://irc.freenode.net/#tomu: live chat for discussing anything related to the project
We designed Tomu to
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