一种是舞蹈展示模式dance_mode，开机延时8秒后，就自动展示舞蹈动作。

另一种是走路展示模式walk_mode，开机延时8秒后，就自动展示向前向后走。

这个在代码的第9行修改模式。-One is the dance show mode dance_mode, start delay after 8 seconds, it automatically shows dance moves. Another is to walk the demo mode walk_mode, start delay after 8 seconds, the display automatically go forward and backward. The first nine lines in the code editing mode.