说明：  用单片机控制步进电机 步进电机是机电控制中一种常用的执行机构，它的用途是将电脉冲转化为角位移，通俗 地说：当步进驱动器接收到一个脉冲信号，它就驱动步进电机按设定的方向转动一个固定的 角度（及步进角）。通过控制脉冲个数即可以控制角位移量，从而达到准确定位的目的；同 时通过控制脉冲频率来控制电机转动的速度和加速度，从而达到调速的目的。
(Stepper motor with single-chip stepper motor control is a commonly used mechanical and electrical control of the executing agency, its purpose is to electrical pulses into angular displacement,通俗地说: When stepper drive pulse signal to a receiver, it stepper motor drives the direction of rotation by setting a fixed point of view (and the step angle). By controlling the number of pulses that can control the amount of angular displacement, so as to achieve the purpose of accurate positioning At the same time by controlling the pulse frequency to control the motor rotation speed and acceleration, so as to achieve the purpose of speed.)