The LEGO Stepper Motor made in part 1. This is a demonstration of how the LEGO Mindstorms EV3 Intelligent Brick controlling several Unipolar Stepper Motors. The EV3 running leJOS and connected MCP23017 input/output port expander with I2C interface, several LEGO Stepper Motors can be controlled at a time.
WARNING: Do not try to make this experiment unless you know exactly what you're doing! I will not be held responsible for any damages of your EV3 Intelligent Brick or any other parts!