What is a Stepper Motor Driver?Stepper Motor Driver DefinitionA stepper motor driver is defined as a circuit used to drive or run a stepper motor, consisting of a controller, a driver, and motor connections.Essential Components Controller (essentially a microcontroller or a microprocessor) A driver IC to handle the motor current A power supply unitStepper Motor ControllerThe selection of a controller is the first step to building a driver. It must have a minimum of 4 output pins for the stepper.