上传程序用双公头杜邦线的一端接到数字输入12号管脚，另一端分别间歇接到开发板的GND与5V观察13号板载指示灯的状态变化，同时查看下方的调试窗口观察输出，发现了什么数字输入的作用是什么？返回是是什么?数字输出除了写HIGH与LOW，还可以写入1和0吗？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