通过PCA算法控制单片机产生PWM波，并通过调节PWM波的占空比进而调节电机的转速大小，最后通过控制电机两引脚输出电平的高低，控制电机的转向-By PCA algorithm control microcontroller PWM wave, thereby regulating the size of the motor speed and adjust the duty cycle of the PWM wave, last, control the rotation of the moto