以单片机AT89S52为核心，利用温度传感器DS18B20采集外界温度并显示在数码管上.代码中设定了温度上限，当外界温度不小于这个温度上限是蜂鸣器就是响-AT89S52 MCU as the core, using temperature sensor DS18B20 collecting ambient temperature and in digital tube display. The code sets the maximum temperature, when the tempera