基于AT89S52与DA0809芯片的多功能数字电压表C语言程序代码。其功能是通过按键切换来实验，其精度可以达到0.01V。-AT89S52 chip-based multi-functional and DA0809 digital voltage meter C language program code. Its function is to switch to the adoption of key experiments, its accuracy can be achieved 0.