本代码实现了一个基于DS18B20数字温度计和51单片机的温度测量和控制系统。系统共分三个模块：温度测量部分、温度控制电路部分与单片机控制部分。数字温度计直接将水温值读入单片机来完成检测水温，并实现实时显示温度，通过比较当前温度与目标温度，来输出控制信号——控制继电器通断从而控制电热杯电源通断，以实现温度调节和保温功能。-This code implements a circuit system based on 51 SCM, which is used to control the temperature of the water in heater by a SCM. The system is composed of three sections: the module of measuring temperature system, the module of controlling temperature system and the module of software. The digital thermometer gives the temperature value of the water to the SCM, which display the current temperature even and again. Through the comparison of the target temperature and the current temperature, the SCM export a control signal to control the heater s condition (on/off) by relay, to realize the function of controlling the temperature and keeping the temperature.