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摘要
DS18B20是一种可组网的高精度数字式温度传感器，由于其具有单总线的独特优点，可以使用户轻松地组建起传感器网络，并可使多点温度测量电路变得简单、可靠。本文结合实际使用经验，介绍了DS18B20数字温度传感器在单片机下的硬件连接及软件编程，并给出了软件流程图。
该系统由上位机和下位机两大部分组成。下位机实现温度的检测并提供标准RS232通信接口，芯片使用了ATMEL公司的AT89C51单片机和DALLAS公司的DS18B20数字温度传感器。上位机部分使用了通用PC。该系统可应用于仓库测温、楼宇空调控制和生产过程监控等领域。
关键字：温度测量；单总线；数字温度传感器；单片机
Abstract
As a kind of high-accuracy digital net temperature sensor，DS18 B20 can be used building a sensor net easily. It can also make the net simple and reliable with it's special 1-wire interface .This paper introduces the application of DS18B20 with single chip processor.
The system is constituted by two parts the temperature measured part and displayed part. The temperature measured part has a RS232 interface. It used AT89C51 of ATMEL company and DS18B20 of DALLAS company .The displayed part uses PC .This system is applied in such domains as warehouse detecting temperature；air-conditioner controlling system in building and supervisory productive process etc.
Key words：temperature measure；single bus；digital thermometer；single chip processor；