51单片机控制一个舵机自由转动，在小车及其他需要用按键控制舵机的可以看看，刚学习舵机控制的也可以看看。-51 microcontroller using the 1 button control steering gear changes to freedom, in the car and other places need steering gear, especially need to button control, you can see, just learn steering gear can also take a look.