按键扫描驱动程序 写的还不错，希望大家看看阿！第一次上这个网，才知道这个网好好啊！-button scanning driver wrote was pretty good, we hope to see A! First on the net, before we know the net good ah!

利用C语言编写一个很好的矩阵式按键扫描程序.-C language a good matrix keypad scanning procedures.

AD 转换程序,可用于电压检测，或者用于按键扫描，很方便。- AD converter can be used for voltage detection, or for key scanning, very convenient.