For my robotics minor at Hogeschool Leiden I'm creating an inverted cartpole robot that balances by itself.

Hardware and wiring here

• 1 Arduino Nano
• 1 MPU9250 Accelerometer / Gyroscope / Magnetometer
• 2 A4988 stepper motor drivers
• 2 bipolar stepper motors
• 1 > 47 µF capacitor to prevent voltage spikes to the driver.
• 1 big breadboard
• Some big boy batteries to power everything. (I had 2x 3.7v batteries)

If you want to build the robot exactly like mine you also need some m3 threaded steel and some washers plus nuts to mount the breadboard to the board you 3D printed with your 3D printer. :)

See src/constants.h for which pin goes where. MPU9250 needs SCA / SCL cables connected to the Arduino nano.

You need to use platformio to compile and upload this to your Arduino.