Picture of Self Balancing Unicycle
Following the popularity of our self balancing scooter and the SciChair we decided to try something a little edgier, the Self Balancing Unicycle.

This project reuses a lot of stuff from our previous projects, using an arduino as the brains behind the scenes.

Step 1: Ready your tools

Picture of Ready your tools
Before we begin lets ensure we have everything we need. For this project you probably want to be fairly comfortable with welding as you need to build a rigid frame.

Additionally you will need:

•Steel square tubing for frame
•24VDC 300W motor
•Arduino UNO - Check your local suppliers or eBay.
•Sabertooth 2x25 Motor Controller ( www.dimensionengineering.com or a local supplier)
•5 DoF analogue IMU - available on ebay (to be replaced with digital IMU at some point)
•Scooter wheel, sprocket, chain and axle - available as a kit
•Shielded multi core cable for the accelerometer and heavy power cable for the motors
•Deadman switch
•Toggle switch for adjusting balance position.
•DC connector for Arduino.
•DIL pins to suit Arduino
•Double sides tape
•Screws etc
•Drill and drill bits
•Welding equipment and saftey gear
•Soldering iron and solder
•Wire cutter and wire strippers
•Heat shrink and hot air gun to shrink it
1-40 of 41Next »
67tadejudrih6 months ago


can i get electrical schematics? because I can not tie electrical work


soliveira97 months ago

Nice project!

But I think there is one thing left... Can you put photos showing all the connections? I think that is what all people want to see!

SidharthG7 months ago

does the rpm of the motor matters?

i mean do we need the rpm to be in a certain range, or it will work for any range of rpm

mdrafeeq.khan8 months ago

can i use BTS 7960 b instead of sebertooth controller

Fun project! well done.

what is the weight of the SBU?

I bought a moCycl at and they say it is the lightest SBU.

PranavN8 months ago
please.. can you make the battery specs available. ?
PärM19 months ago

Great for all of those skillful techies out there who likes the idea of a self build. For us with laziness as a way of life, just head over to moCycl.com and order a ready made one delivered to your doorstep. cheerio

XenonJohn PärM19 months ago

This Russian one is best properly controllable design I have seen with steering and a seat. Does not come up on any search engines but check out the video. Quite low priced too.


pierretotz110 months ago

Im planning to build one, is it possible to build it with an inhub dc motor typically found in ebikes?

Hub motors these days are almost all brushless. This means you need a brushless motor power controller that can be controlled by your arduino. It can be done but expensive.

guys is there any book that has orderd programming tutorials on arduino

PranavN10 months ago

Cool project. Liked it a lot. I am thinking of trying it, but I am experiencing a problem choosing correct battery. Could you please suggest the right one, like if you tell the one you have used, it will be excellent and helpful.

Thank you.

ZackY111 months ago

Do you guys like self balancing unicycle without a chair?

fwenzel1 year ago
Where is the code??
ScitechWA (author)  fwenzel1 year ago

Step 7 - Code.
Open the txt file and copy the contents into the Arduino IDE or rename the file extension to .ino

They will not allow a file with .ino on Instructables.

Thanks for the fast answerse, but, in step 7, here in my PC, I could not, found file for download. I think something is wrong here... Please, can someone send me for email the code. frediwenzel@gmail.com
ScitechWA (author)  fwenzel1 year ago


BikeHacker1 year ago


JimRD1 year ago
Where is the code?
ScitechWA (author)  JimRD1 year ago
Sorry, but i could not found it...
danaG751 year ago

I have a quick question concerning the toggle switch for balance position.

Are you using a SPDT Rocker Switch and is it monetary?

I also plan on build a unicycle very similar to yours and I'm currently the sourcing parts.

Tyde1 year ago

Super unicycle
I'm also building
I would like to have the dimensions of the frame
to the same

Thank you in advance
congratulations on your new tutorial, and thanks for the valuable advice you give.
MaleBuffy2 years ago
What size wheel is that and what size sprocket?
ScitechWA (author)  MaleBuffy2 years ago
It is a 12.5" wheel with a 80 tooth sprocket from http://www.oatleyelectronics.com/
Under wheels.
catoctober2 years ago
Where did you get the wheel, sprocket, chain, and axle kit?
ScitechWA (author)  catoctober2 years ago
They were bought from http://www.oatleyelectronics.com/
jgabuna2 years ago
Awesome project. Looking forward to see a 3 axis self balancing steadicam. :)
Dylon1242 years ago
How much did the arduino cost?
ScitechWA (author)  Dylon1242 years ago
The arduino uno is about $33 AUD on Sparkfun but you can find them for around $12 on ebay.
PLEASE use a standalone arduino!
Crotus2k2 years ago
Of all the cool gadgets I saw on TV, cartoons and in comics growing up, I would not have guessed that B.C.'s ride would ever be made into reality. You guys are great. Keep building stuff just because.
ced782 years ago

Great, I'd like more details on the construction of the frame Self Unicycle
ribs, material, etc.
Looks cool, but... video?
ScitechWA (author)  fungus amungus2 years ago
A gross oversight. Video is up now.
bob30302 years ago
Cool. I like arduino and Mobility devices. Great way to make a unicycle that Segwayed into a robotic mobility device. (sorry for the humor attempt). Thanks for posting.
wilgubeast2 years ago
Cool project, and that final note on testing is fantastic.
jxross2 years ago
Everyone is thinking it so I'm gonna' just say it:

The first photo just looks "wrong".

1-40 of 41Next »