利用stc单片机内部的ad ad来自动调整运放的放大倍数，从而再利用ad进行采样-The use of automatic adjustment of operational amplifier STC MCU internal ad ad amplification, and then use AD sampling

PROTEUS 仿真，包括 采样电压AD转换，12864显示，翻屏，参数设置，检测外部状态，LED输出。- PROTEUS simulation including the sampling voltage AD conversion 12864 display screen parameters set to detect the external state of the LED output