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视频的代码和官网的例程代码都试过了，还是没有拐弯效果怎么办，只能直线走
那就把小车寄回卖家维修呗。
不能通过调pid解决吗
使用分离变量原则：先写程序测试小车能否单独左右转，再看追小球程序的pid输出是否是能让小车旋转的值，一步一步找问题