说明：  该源码基于５１单片机，实现小车的摇头避障功能，使用ＨＣ　－ＳＲ０４超声波模块探测距离返回给单片机，单片机控制舵机实现小车的“摇头”，四个直流电机采用俩个Ｌ２９８Ｎ控制
(The source code based on 51 single-chip, to achieve the car s shaking his head obstacle avoidance function, the use of HC-SR04 ultrasonic module detection distance back to the microcontroller, single-chip control steering gear to achieve the car s shaking his head , four DC motor using two L298N control)