步进电机测试程序，功能包括正转和反转。5线4相，可以用普通uln2003芯片驱动，也可以接成2相使用，可以配套5V单片机开发板直接使用，直接插接，方便使用。具体接线方式参考代码的端口定义。-Stepper motor test procedures, functions, including forward and reverse. 5-wire and 4-phase drive ordinary uln2003 chip can also be connected into a 2-phase, supporting 5V microcontroller development board directly use, direct plug, convenient to use. Specific the wiring port reference code defined.