本设计以AT89C52单片机为核心，以4*4矩阵键盘为输入，光电对射式传感器为测速原件达到了对步进电机的测速与调速目的，完成了本设计的基本要求。-The design for the AT89C52 microcontroller as the core, 4* 4 matrix keyboard input, photoelectric beam sensor for velocimetry original reach of the stepper motor speed measurement and speed control purpose, to complete the basic requirements of the design.