温、湿度测量系统设计与实现

论文编号:DZXX107  论文字数:15405,页数:55

摘要
 随着现代工业生产与电子技术的联系越来越紧密，温、湿度测量在行业和领域中得到了广泛运用，实施对温、湿度的实时监控，对保证生产安全因素，提高劳动效率，改善生产环境有很重大的应用价值。
 本课题针对室内温、湿度实时测量进行设计。采用DHT90专用芯片作为温、湿度传感器，通过其内部信号处理与模数转换，将输出数据送入AT89C52单片机进行数据处理与显示。论文分析了DHT90的工作原理，设计了完善的温、湿度实时测量系统。硬件设计采用protel99se工具，软件设计采用Keil uVision2版本c语言编程。
 系统设计完成后，功能稳定可靠，且具有声音与发光管报警、时钟显示等扩展功能。

关键字： 温度测量；湿度测量；预值报警；时钟显示

ABSTRACT
 With the modern industrial production and electronic technology becoming closer than ever before, temperature measuring and humidity measuring have been widely used in many industry applications. Monitoring temperature and humidity can help to ensure the safety of work house, enhance labor efficiency and also has a great practical value in improving the producing environment.   The design was mainly for the measuring of temperature and humidity inside the house. DHT90 was chosen as a temperature and humidity sensor. After series of internal signal processing and analog-to-digital conversion, digital DATA were sent into AT89C52 single-chip microcomputer for the calculation and finally displayed on a monitor. This study analyzed the operational principle of DHT90, design the perfect system for measuring temperature and humidity in real-time. Took Protel99se as a tool to design hardware, and utilized Keil uVision2 Version to design the software in the form of C language.   When the design has been accomplished, system was able to perform stably and output reliable DATA, and had some extra functions like voice &LED alarm and time display.
 
Keywords: Temperature measuring；Humidity measuring；predefined warning gate；
time display

目录

摘要 I
ABSTRACT II
第1章 引言 1
1.1 背景与意义 1
1.2 研究内容 2
第2章 温、湿度检测系统 3
2.1 温、湿度的概念 3
2.1.1 温度的定义 3
2.1.2 湿度的定义 3
2.2温、湿度传感器的分类及特点 4
2.2.1 温度传感器的分类及特点 4
2.2.2 湿度传感器的分类及特点 5
2.3 基于51单片机的温、湿度检测系统原理 5
2.4 设计方案的论证与比较 6
2.4.1 温、湿度测量部分 6
第3章 温、湿度检测系统的硬件设计 7
3.1 系统的设计 7
3.2 系统主要功能要求 7
3.3 主要芯片及传感器介绍 8
3.3.1 AT89C51单片机 8
3.3.2 DHT90 11
3.3.3 四位共阴数码管 14
3.3.4 声音芯片  15
 3.4  系统的具体电路设计  16
3.4.1数码管显示部分 ..16
3.4.2声音芯片部分 ..16
3.4.3 DHT接口电路 ..17
3.4.4按键和LED报警电路 18

第4章 温、湿度检测系统的软件设计 19
4.1 引言 19
4.2系统的软件设计介绍 19
4.2.1该系统的主流程图 19
4.2.2系统代码 20
第5章 系统调试 29
第6章 总结 30
致谢 31
参考文献 32
附录1：程序 33
附录2：电路原理图 49
附录3：元件清单 50
附录4：实物图 51