Live the Ohm.

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What is the OhmDuino? It´s basicly a small keychain, that not only has a unique formfactor but is also perfect for the first steps in programming a µC.

What is the OhmDuino? That´s a very good question!! 

It´s basicly a keychain with some fancy LEDs, a capacitive touchsensor and a unique shape, that honors the great achievements of Georg Simon Ohm and is actually the logo of our university, the TH Nürnberg.

It discribes our lifestyle full of making, building and DIY.

It´s the perfect starting point to get into electronics and programming.

It´s opensource.

Where can you get one ? There is an eBay-Store and  a Tindie-Store to get one, but you can also make one yourself!! The Eagle-Files are free for everyone!!

How can you program it? Plug it into your USB-Port, load a sketch in the Arduino-Ide and let the the fun begin!!

Are there examples on how to get started? We wrote several sketches to show the basic functions of the OhmDuino. For easy access, they are all available in the download section of our Hackaday-Page.

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More information:

-> The OhmDuino features:

  • 25 blue LEDs, which can be controlled individually via multplexing.
  • two capacitive touch sensors, which can recognize fingers touching the PCB or the touchpads.
  • an Atmega32U4 with it´s built in USB-connection.
  • an ISP-/SPI-port for burning bootloaders or programms on the µC.
  • an I2C-port and additional connection points for VCC and GND, to enable modifications and connectivity.
  • a PPTC-fuse to protect your OhmDuino and your PC from damage,

-> The Hackaday-Page of OhmDuino contains:

  • programming examples with explanations in the commentline.
  • a manual (for now only in English) on how to set up the OhmDuino and how to do the first steps.
  • all needed files, like the schematics, to understand how the OhmDuino works.

-> The OhmDuino is a good choice for you, if you:

  •  are openminded.
  • want to experience something new.
  • see the world in 0 and 1.
  • don´t know what counting binary looks like.
  • have a nerdy girlfriend or boyfriend.

Fehldende Bibliothek - Touch_Bitmap_Changer.pdf

Anleitung zum Einbinden einer Bibliothek in die Arduino IDE

Adobe Portable Document Format - 297.34 kB - 12/28/2018 at 16:40



manual for the OhmDuino (german language)/ Anleitung für den OhmDuino (in deutscher Sprache)

Adobe Portable Document Format - 1.20 MB - 12/17/2018 at 19:27



change your bitmaps through a press on the touch-buttons

ino - 3.00 kB - 12/10/2018 at 20:42


Adobe Portable Document Format - 75.98 kB - 12/10/2018 at 20:42



BitMaps can be displayed

ino - 2.33 kB - 11/26/2018 at 19:53


View all 8 files

  • OhmDuino RGB

    Kirschner Christoph08/13/2019 at 17:28 0 comments

    We, the OhmDuino-Team, have very good news!!

    We finally made the step to update your PCB and to integrate a few new features!!

    New features:

    => RBB-LEDs (WS2812B-2020)

    => DIY-Area for soldering and tinkering

    => BMS for Lipo`s

    We also added a different uC- and clock-Footprint to the PCB to try out new packages.

    What do you think about this news?

    Do you have any ideas to improve our product?

  • Blinky Blinky

    Kirschner Christoph11/20/2018 at 18:16 0 comments

  • First real prototypes

    Kirschner Christoph11/20/2018 at 18:03 0 comments

    What you can see above is one of the first real prototypes of our OhmDuino.

    If it gets plugged into your computer, the OhmDuino can be programmed via the Arduino IDE and get`s noticed as Arduino Leonardo.

    We also wrote a small test-sketch to bring some life into the LEDs. 

View all 3 project logs

Enjoy this project?



Sophi Kravitz wrote 01/24/2019 at 21:21 point

Nice project. I only wish it had one of those beepers to ping when you lose your keys!

  Are you sure? yes | no

Kirschner Christoph wrote 01/24/2019 at 21:37 point

thank you!!! that´s true, the Ohmduino is a really silent friend :D

  Are you sure? yes | no

Jan wrote 11/21/2018 at 18:23 point

Sweet! Though that small keychain-PCB-hole would break off easily after two days carrying around with my keys :)

  Are you sure? yes | no

Kirschner Christoph wrote 11/22/2018 at 08:09 point

Should be pretty stable :) it´s also 2mm PCB :)

  Are you sure? yes | no

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