Abstract
Stepper motor is an electrical pulse signal converted into angular displacement of electromechanical components, motors will each receive an electric impulse a step angle of rotation, and therefore also called step motor stepper motor or pulse motor. The design STC89C51 microcontroller as the core to build a stepper motor drive system, through I/O port output timing of the square wave signal as a control stepper motor drive signal through Darlington ULN2003 stepper motor drive. Then through an external keyboard circuit, thyristor display circuit can be achieved on the stepper motor acceleration and deceleration, reversing, effective control of start / stop
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