利用51单片机作为主处理器，利用18b20测环境温度，利用1602液晶屏显示环境温度，并通过按键设置预警值，超过预警值流水灯和蜂鸣器报警。-Using 51 single-chip microcomputer as the main processor, the use of 18B20 measuring ambient temperature, the use of 1602 LCD screen display environment temperature, and by setting