基本功能：

实现四项八拍步进电机的变速控制：加速，恒速，减速；可以按键控制正反转，具有声、光报警功能。



扩展功能：

1、以led数码管显示当前○1上电等待状态，○2运行状态（正转、反转标志，加速、恒速、减速，以及当前速度等级。），○3停止状态。

2、实现给定值控制步进电机速度。

-Basic functions: to achieve eight shot four stepper motor speed control: acceleration, constant speed, deceleration　can button control rotating, and with sound, light alarm. Extension: 1, led digital display current ○ 1 power wait state, ○ 2 run state (forward and backward signs, acceleration, constant speed, deceleration, and the current speed grade.), ○ 3 stop state. 2, to achieve a given value of the speed control stepper motor.