串口12864加ADC0809做成的电压表。包含两部分，如想更好的理解请先看看独立的模块尤其是串口 12864 的使用。-Serial 12864 made of Canadian ADC0809 voltmeter. Consists of two parts, if one wants a better understanding please take a look at a separate module, especially the use of serial port 12864.