at89c51单片机为控制核心，它既负责读取DS18B20测得的冷藏室温度，并输出至液晶模组显示，同时又产生实时时钟供液晶显示，并且还负责键盘输入扫描及控制压缩机的运行-AT89C51 single-chip microcomputer to control the core, it is responsible for reading DS18B20 measured refrigerator temperature, and output to the liquid crystal d