Self-Balancing Electric Unicycle. Stephan writes –
I recently built a partially self-balancing electric unicycle called “Bullet,” featuring:
- A custom MIG-welded steel chassis
- A 450 Watt electric motor
- Two 7 Ah 12 Volt batteries
- A 5DOF intertial measurement unit
- The OSMC H-bridge
- An ATmega328P microcontroller
I say “partially” self-balancing because it only balances along one axis (forward/backward), and the rider still needs to balance left and right (it’s analagous to riding a bicycle “no hands”). It operates much like a Segway — you lean forward to accelerate, and lean back to brake. The top speed is about 15 mph, and it easily goes 5 miles on a single charge. This is my primary mode of transportation on the MIT campus.
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