本文主要介绍了一个基于 AT89C51 单片机的温度测量系统，详细描述了利用数字温度传感器 DS18B20 开发测温系统的过程 ，对数字温度传感器 DS18B20的数据采集过程和ULN2003A对步进电机的驱动过程做了详细介绍。该系统可以方便的实现实时温度采集和显示，驱动步进电机转动，并可根据需要任意设定上下限报警温度 。本文还设计实现了主从机之间的串行通信，主机可以对从机进行实时监控，抗干扰能力强，适合于恶劣环境下进行现场温度测量，有广泛的应用前景。-This paper mainly introduces a temperature measurement system based on AT89C51, describes in detail using digital temperature sensor DS18B20 temperature measurement and control system in the development process, the data acquisition process of digital temperature sensor DS18B20 and ULN2003A process of stepper motor driver made a detailed introduction. The system can easily realize real-time acquisition and display of temperature, driving a stepper motor rotation, and can be arbitrarily set upper and lower alarm temperature according to need.