I am a UK student and this is a log of my A-level D&T Design Engineering project. I am using cheap Chinese parts and items you can get from a DIY store to make a self-balancing bike. The aim of my project is to produce a design that someone with access to standard secondary school equipment can easily reproduce.
I am using an Arduino in order to control the reaction wheel on my project. The Arduino uses C which I have been teaching myself and will use interrupts in order to control the speed and direction that the wheel spins. The program will use pulses given by the detector to calculate the speed and direction by being out of phase.
After the frame I started making the wheels which I decided to cut out of 4mm plywood on a laser cutter which I had access to at school. The wheels are made of 3 layers of ply, the outside has a diameter of 200mm and the inside has a diameter of 198mm. I stuck the wheels together using PVA glue and clamped them together amd left them for a few hours each. This small gap in-between makes it so I can fit a rubber O ring around the wheel for better grip.
After a few weeks of thinking about how I could improve my design I decided to make the main frame out of copper pipe and made a design of it on OpenSCAD. I also made boxes for the battery to protect it, the flywheel to support it and the front wheel for support and to fit the motor onto.
This concept was an initial brainstorm that we had to design ourselves. Initially I thought it would be best to make the frame out of Plywood. I then made a foam model of the project so I could get an idea of the size and where I could put components.