控制小车例程。运行程序进入主界面，点击相应按钮控制小车。其中有控制小车的前进、后退、左拐、右拐、停止、循迹和设置小车速度的功能。-Control car routine. Run the program into the main interface, click on the appropriate button to control the car. Which control the car forward, backward, turn left, turn right, stop, a