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- 由单片机P2口输出的脉冲信号来模拟4相线圈产生的电流,来控制步进电机,用4个LED亮灭的快慢来模拟电机的速度,用它们的亮灭顺序来模拟电机的相序和拍数。-P2 port output from the MCU to simulate the four-phase pulse signal generated by the coil current to control the stepper motor, with 4 LED light blinking speed to simulate th