文档介绍：目录
引言 . ............................................................
1
1.
概述 . ..........................................................................
15
附录二
系统原理图 ...........................................
26
II
电子温度计的设计
摘要：该设计介绍了 DS18B20 型数字温度传感器内部结构及工作时序，并提出了以 DS18B20 和 AT89C51 为核心设计的数字温度计设计方案。实践证明，该数字式温度计的
测温范围为 -50～+110℃，精度误差在 ℃以内，具有测温精度高，控制性能良好等特点。设计还介绍了一种基于 51 单片机和 DS18B20 数字温度传感器来进行温度测量的方法，包括温度传感器芯片的选取、单片机与温度传感器接口电路的设计，以及实现温度信息采集
和数据传输的软件设计。该温度计完全适用于一般的应用场合，也可在高低温报警、远距离多点测温控制等方面进行应用。
关键词：数字温度计，单片机，温度传感器
III
The Design of Electronic Thermometer
Abstract : This paper introduced the inner structure and job sequence of the digital temperature sensor DS18B20，and put forward a digital temperature design of the core design according to DS18B20 and AT89C51．Practice testifies that the digital temperature's measurement range is-50～ + 110℃，and accuracy error is within ℃ . It has high measurement temperature accuracy， fine controlling characteristic，and so on．A practical temperature measuring method based on microcontroller and DS18B20 digital temperature sensor was presented． The selection of temperature sensor chip was discussed and the design of hardware interface circuit and related software were dealt with in more details．The temperature completely fits to be used for the average application，also may be used to the field of high or low temperature alarm，controlling of the remote and multiple spot's temperature measurement， and so on．
KEY WORDS： Digital Thermometer , Microcontroller , Temperature sensor