说明：  步进电机_28BYJ-48介绍和驱动及编程_步进电机小知识,学习步进电机的原理和C代码的编程控制步进电机
(Stepper motor _28BYJ-48 introduced and programming _ stepper motor drive and a small knowledge, learning the principles of the stepper motor and the C programming code stepper motor control)