I'm Tomu a tiny ARM microprocessor which fits in your USB port. I have two buttons and two LEDs.

• Announcement mailing list - Low traffic list for announcements.
• Discussion mailing list - List for discussing development / new features / etc.
• IRC Channel - irc://irc.freenode.net/#tomu - IRC channel for discussing anything related to the project.

Built out of a 3d printed part + 2 layer "thin" PCB (0.4mm or 0.6mm thick).

The board has;

• 6mil traces
• 6mil clearance
• 0.3mm drill / 0.6mm vias

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Uses a Silicon Labs EFM32HG309 (datasheet, reference manual).

The important features are;

• ~$2.15 USD on Digikey
• QFN24 - 5mm x 5mm package
• Inbuilt 5V to 3V3 regulator.
• Crystal-less USB

These make something which is almost hand solder-able fit into the tiny size.

All parts are ordered from Digikey but could easily be ordered from somewhere else.

• Digikey BOM in CSV format

Individual parts;

• Resistors

• 2 x 0402 - 15 Ohm - Digikey
• 2 x 0402 - ~50 Ohm (Depends on LED choice)

• Capacitors - Digikey Capacitors 0402, >1uF

• 2 x Capacitor 1uF 0402
• 1 x Capacitor >10uF 0402

• 2 x LED 0402

• You choice of two different colors (might require adjustment of R1/R2).
• 5mA LEDs are better choice.
• Get highest millicandela rating you can.
• Digikey Search of LEDs in 0402 package

• 1 x EFM32HG309 or EMF32HG308

• Create the device
• Create the 3d print model.
• Write the firmware for the device.

The aim was to prove that a device which fits in your USB port could be created by hobbists in small quantities extremely cheaply.

TOMU comes from the abbreviation "Tim's Open Micro USB".

What ever you want! If you do create something, please send me the info!

The contents of this repository excluding "third_party" folder is released under your choice of the following two licences:

• the "Creative Commons Attribution-ShareAlike 4.0 International License" (CC BY-SA 4.0) full text of this license is included in the LICENSE file and a copy can also be found at http://creativecommons.org/licenses/by-sa/4.0/

• the "TAPR Open Hardware License" full text of this license is included in the LICENSE file and a copy can also be found at http://www.tapr.org/OHL