上位机pc控制下位单片机来控制步进电机转向，可以实现软硬实现步进电机的启动和停止，可以实现软件的控制转向。-Under the control of the host computer pc-bit microcontroller to control the stepper motor turn, can achieve the stepper motor hard and soft start and stop, the software can control the steering.

利用51单片机设计的步进电机控制系统，有正反转，加减速，启动和停止键，完整论文-Using 51 single-chip stepper motor control system design, there are rotating, and acceleration and deceleration, start and stop button