智能小车循迹+跷跷板 实现板下和板上两种模式，实现自动上板，自动在板上找到平衡，自动往返！声光报警！ lcd液晶显示！-Smart car tracking+ seesaw realization of board and board the next two modes, automatic on board to automatically find a balance board, automatic round trip! Sound and light alarm! lcd LCD!