一.实物图 二.例子代码 注:代码来自老外 http://www.4tronix.co.uk/arduino/Stepper-Motors.php 功能:控制电机正反转 // This Arduino example demonstrates bidirectional operation of a // 28BYJ-48, using a ULN2003 interface board to drive the stepper. // The 28BYJ-48 motor is a 4-pha