Sumobot Jr. is an open source sumobot design made for Nodebots Day. Most existing sumo kits cost between $99 and $160. Since we're trying to keep our event costs down, I decided to try to design a bot that could be put together for around $50 including the cost of the Arduino. The name and design are inspired by the simplicity and zip-tied wooden beauty of the Printrbot Jr.
If you want to jump right into it, you can watch this instructional video:
Sumobot Jr Assembly video for Nodebots Day 7/27
Customizing Sumobot Jr with Suziam and cats
The main part of the design is a cutting sheet in EPS file format that is designed to be used with a laser cutter. You can find it in the cutting_plans directory. If you don't have a laser cutter, you can use a CNC, tape your printout to balsa wood and go at it with an x-acto knife, or send it to a laser cutting service like Ponoko and get the sheet done for about $10.
There is also a directory called 3d_print that contains an STL file for a ball caster designed by sliptonic - the STL is set up for a 16mm ball bearing, but you can make one for other sizes with the included OpenSCAD file.
NEW There is a completely 3D printable version available at Thingiverse now.
Neither do I! The best way to get some help creating the parts is to look up your local Hackerspace or Makerspace and connect with them. I belong to a fantastic hackerspace in Las Vegas called SYN Shop!
If you don't have a hackerspace nearby, you can also use a mail order service like Ponoko that does both 3D printing and laser cutting.
- Arduino - $25
- 4xAA battery holder - $2
- 2 Zip ties - ?
- 5 #4 3/8" wood screws - ?
- Thick rubber bands - ?
- 2 continuous servo motors like Futaba S148 - $28
- Some wire or leads
- 16mm ball bearing - ?
That's about it! Connect the red and black leads on the servos together, then connect them to the + and - terminals on the battery holder respectively. Then connect the black leads and - terminal to the ground of the Arduino. Finally, the white leads of each motor go to pins 9 and 10 (or whatever you lke) on the Arduino - you're done!
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Made by
Design by @makenai with feedback and ideas from @suziam aka (by their powers combined) Amalgamation of Cats.