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EGG Electric Unicycle is a DIY and OpenSource design that can be customized for specific needs (more batteries, powerful motor, lights, etc). Main characteristics of current version:
- Max velocity up to 30km/h
- 2 battery packs making a total of 264W (range of 20kms on flat roads with a rider of 100kgs)
- 500W motor, 14 inches wheel
- Bluetooth for configuration and reading in real time the speed, current, board temperature, etc
An Electric Unicycle (EUC) is a small and simple device. It's composed on mainly 3 parts: motor/wheel; electronic board and battery - all the parts can be bought online and it's easy to assembly. The plastic shell can have a custom design and be 3D printed at home or at local 3D printing shop.
Building our own Electric Unicycle have many advantages:
- Customize for your specific needs: more battery packs for more range; more powerful motor for more speed; etc
- Being able to fix it if something broke with time, like exchanging and old battery for a new one
- Save on price: you can build an high range EUC for the price of a lower range
- Customize the colors
The first stable version of EGG EUC were achieved on Jun 2016.
The motor used is the MicroWorks 500W 30km/h 14" wheel, the board used is the MicroWorks 30B4 and the battery used is a generic electric unicycle pack of 60V. The mechanical parts like the pedals, pedals arms, nuts and bolts, tire and inner tube were all bought from MicroWorks.
The shell were designed using FreeCAD software that is free and OpenSource. The shell were designed to be 3D printed (if you don't have a 3D printer, you can search on your town for an hacker space or such that may provide 3D printing services) and the sources files including the 3D printable files (STL) are available here on github.
After sourcing the parts (see the next part list) you will also need some basic tools like a measuring tape, screwdriver, metal hacksaw, etc.
To build the shell you will need:
- 8mm threaded shafts and 4 nuts: 4 pieces of 240mm length each (can be found at cheap on local hardware stores)
- 4 metal hose clamps (can be found at cheap on local hardware stores)
- 3D printed parts - this files were printed on a RepRap type of Prusa I3 3D printer