这个例程是基于51单片机控制和adc芯片ADC0809 来测量电压，通过本例程，要学会ADC0809的驱动程序的编写，就可以在各个平台上使用-This routine is based on 51 single-chip control and adc chip ADC0809 To measure the voltage through this routine, we must learn the preparation of the ADC0809 driver can be us