整个程序是一个嵌入式开发的电压表，一个很强大的单片机模拟嵌入式开发程序，本电压表量程为0到5V，c++编写源程序(The whole program is an embedded development voltmeter. It is a powerful simulation embedded development program. This voltmeter has a range of 0 to 5V, and c++ is the source program.)