An A4988 stepper motor driver is a great way to drive stepper motors. It requires a digital pulse signal to run the stepper motor for consecutive steps. It also features a micro-stepping function. The RPM of the stepper motor depends upon the frequency and duty-cycle of the input pulses. In this project, I will be showing you how you can make a simple stepper motor controller by using a 555 timer IC as a digital pulse generator and get the motor running.