I made easy robot with Arduino Uno and Pololu Motors / Wheels.
Hand power and Bluetooth remote control.
youtu.be/aIyjU6GiT-0.
Balancing robot capability with Gyro. (not tried yet…)
- Thingiverse
thingiverse.com/thing:890397 - Pololu Motor and Wheel are below
pololu.com/product/993
pololu.com/product/642