舵机的工作原理。舵机常用的控制信号是一个周期为20毫秒左右，宽度为1毫秒到2毫秒的脉冲信号。当舵机收到该信号后，会马上激发出一个与之相同的，宽度为1.5毫秒的负向标准的中位脉冲。-Steering works. Servo common control signal is a period of about 20 milliseconds, a width of the pulse signal 1 ms to 2 ms. After receiving the servo signal, it