基于51的数字电压表，adc0808，带protues仿真原理图，六位共阴数码管-Based on 51 digital voltmeter, adc0808, with protues simulation schematics, six were negative digital

51做的数字电压表源代码程序,可直接移植使用-51 do digital voltmeter source code, can be directly transplanted to use