数据时钟的温度警报，DS18B20传感器能测量实时的温度，然后将测得的温度信息传递给51单片机，然后51单片机通过I/O口，显示在LCD1602屏上。报警装置采用蜂鸣器，单片机通过判断接收到的时间信号和温度信号来判断是否需要报警，然后让蜂鸣器响应。(The temperature alarm of the data clock, the DS18B20 sensor can measure the real-time temperature, and then transfer the measured temperature information to the 51 single chip microcomputer, and then the 51 single chip microcomputer is displayed on the LCD1602 screen through the I/O port. The alarm device adopts buzzer, and the microcontroller determines whether it needs alarm by judging the received time signal and temperature signal, and then makes the buzzer respond.)