1. 可实现步进电机起停控制，一键实现

2.可实现步进电机正反向控制，一键实现

3.可实现步进电机调速控制，速度三级，1级最低，3级最高，速度变化明显，一键实现

4.运行指示灯一个，起动后点亮，停止后熄灭，三个速度指示灯，速度为1级时一个指示灯亮，速度为3级时三个指示灯亮

-Can be realized from the stepper motor stop control, a key to achieve 2. Positive and negative control, a key to achieve 3 stepper motor. Stepper motor speed control, the speed of three and a minimum three highest speed changes, a key to achieve 4 running lights a lit after start, stop and turn off after three speed indicator, the speed of a light, the speed for three indicator lights when the three