SlushEngine has been designed to provide users with an advanced stepper motor driver that is compatible with the Raspberry Pi single board PC, allowing projects ...

Rather than having the host Pi communicate directly with the stepper drivers, the 3+Pi features an onboard STM32F302CBT6 that handles the actual motor control.

Adafruit explains : “Since the Raspberry Pi does not have a lot of PWM pins, we use a fully-dedicated PWM driver chip onboard to both control motor direction and speed.

Nothing that a NEMA 17 stepper couldn’t handle, however. After printing a few gears and wiring up an Easy Driver board between the Raspi and stepper motor, they had the basics of a door opener ...