基于DS18B20__+89C52单片机的数字温度计的设计).doc

Design of Digital Thermomer Based on SCM In daily life and industrial production process, often used in the detection and control of temperature, temperature is the production process and scientific experiments in general and one of the important physical parameter. Traditional thermocouple and temperature components are the second resistor. The thermocouple and thermal resistance are generally measured voltage, and then replaced by the corresponding temperature, these methods are relatively complex, requiring a relatively large number of external hardware support. We use a relatively simple way to measure. We use the United States following DALLAS Semiconductor DS1820 improved after the introduction of a smart temperature sensor DS18B20 as the detection element, a temperature range of -55 o C ~ 125 o C, up to a maximum resolution of 0.0625 o C. DS18B20 can be directly read out the temperature on the north side, and three-wire system with single-chip connected to a decrease of the external hardware circuit, with low-cost and easy use. The introduction of a cost-based AT89C52 MCU a temperature measurement circuits, the circuits used DS18B20 high-precision temperature sensor, measuring scope 0 o C～+100 o C, can set the warning limitation, the use of seven segments LED that can be display the current temperature. The paper focuses on providing a software and hardware system components circuit, introduced the theory of DS18B20, the functions and applications of AT89C52 .This circuit design innovative, powerful, can be expansionary strong. Keywords：Temperature measurementDS18B20 AT89C52 Temperatur measurement； DS18B20; LED不要删除行尾的分节符，此行不会被打印目 录 第1章 引言 1 1.1课题背景及研究意义 1 1.2课题的设计目的 1 1.3课题设计主要工作 2 1.4本文研究内容 2 第2章 开发工具Proteus与Keil 3 2.1 Proteus软件简介 3 2.2 Keil软件简介 3 第3章 系统概述 5 3.1设计方案 5 3.2系统设计原理 5 3.3系统组成 6 3.4 DS18B20温度传感器与单片机的接口电路 7 第4章 系统硬件设计 8 4.1 89C52单片机的介绍 8 4.1.1 89C52单片机主要特性 9 4.1.2 89C52单片机管脚图 10 4.2液晶模块简介 13 4.3 DS18B20介绍 16 4.3.1温度传感器工作原理 17 4.3.2 DS18B20相关