该设计中步进电机的驱动芯片采用ULN2003A，驱动程序写入AT89C52单片机中，通过程序控制步进电机的转速与转向。实现软件与硬件相结合的控制方法，使步进电机运行稳定、可靠性高，达到对步进电机的最佳控制。-The design of the stepper motor driver chip ULN2003A, the driver writes AT89C52 microcontroller, program control stepper motor speed and steering. The control method to achieve a combination of software and hardware, the stepper motor running stability, high reliability, optimal control of the stepper motor.