此程序基本阐述了串行AD转换芯片的使用方法及用它来实现将0-5V电压转换成八位数字量的过程，另外还可以利用数码管来显示电压的大小。-This procedure basically described the use of serial AD converter chip method and use it to achieve the 0-5V voltage into a digital eight process, digital tube can also be used to display the size of voltage.