摘要
針對溫、濕度對紙張耐折度的影響，設(shè)計(jì)了適應(yīng)中小型文獻(xiàn)資料庫應(yīng)用的溫、濕度監(jiān)控裝置。此裝置不僅能實(shí)現(xiàn)溫、濕度檢測、溫濕度實(shí)時(shí)調(diào)節(jié)和顯示，而且能實(shí)現(xiàn)溫、濕度參數(shù)上下限定值的設(shè)定，當(dāng)溫濕度超上下限的時(shí)候能夠進(jìn)行報(bào)警，并啟動相應(yīng)的裝置從而改變室內(nèi)溫度。
該控制系統(tǒng)具有檢測精度高、使用簡單、成本較低和工作穩(wěn)定可靠等特點(diǎn)，具有一定的推廣價(jià)值。單片機(jī)具有體積小、重量輕、耗電少、功能強(qiáng)、控制靈活方便且價(jià)格低廉等優(yōu)點(diǎn)。單片機(jī)的應(yīng)用正從根本上改變著傳統(tǒng)的控制系統(tǒng)設(shè)計(jì)思想和設(shè)計(jì)方法。在現(xiàn)實(shí)生活中，對于一個比較大的系統(tǒng)，人們往往采用微機(jī)進(jìn)行控制，小一些的系統(tǒng)較多采用51或96等系列的單片機(jī)。
本文中，我們設(shè)計(jì)了以AT89C51單片機(jī)為主要核心實(shí)現(xiàn)的溫度、濕度控制系統(tǒng)，包括系統(tǒng)硬件和軟件設(shè)計(jì)，可以進(jìn)行上位機(jī)通信，并給出了詳細(xì)的電路原理圖。

關(guān)鍵詞　溫度控制；濕度控制；串行接口; 485總線


The temperature and humidity of the monitor system based on single chip microcomputer
Abstract
According to temperature, humidity on paper folding, the effects of the resistance of the design to small and medium-sized documents database application of temperature, humidity monitoring device. This device can not only realize temperature, humidity, temperature and humidity adjusting detection and display, and can realize temperature, humidity and parameters of the limit of temperature and humidity on the set, and when the time limit to be able to call the police, and start the corresponding device which changes indoor temperature.
This control system has the high accuracy, simple to use, low cost and stable and reliable, and other characteristics, has certain value of popularization. SCM has small volume, light weight, less consumption, function of strong, flexible and convenient control and the price cheap, etc. The application of SCM is fundamentally changing the traditional control system design idea and design method. In real life, for a larger system, people often take the microcomputer control, the smaller system by 51 or 96 more, series microcontroller.
In this paper, we have designed to AT89C51 single-chip microcomputer as the main core of the realization of the temperature, humidity control system, including hardware and software design, can undertake PC communications, and gives the detailed circuit principle diagram.

Keyword　 Temperature control; Humidity control; Serial interface; 485 bus



目錄
摘要…… I
Abstract II

第1章 緒論 1
1.1 課題背景 1
1.2 研究現(xiàn)狀 2
1.3 論文研究內(nèi)容 7
第2章 總體方案設(shè)計(jì) 9
2.1 方案設(shè)計(jì) 9
2.2 系統(tǒng)設(shè)計(jì)原則 9
2.3 本章小結(jié) 11
第3章 硬件設(shè)計(jì) 12
3.1 AT89C51單片機(jī)簡介 12
3.1.1 主要特性 13
3.1.2 外部管腳 13
3.2 測溫度電路 15
3.2.1 內(nèi)部結(jié)構(gòu) 17
3.2.2 DS18B20工作原理 18
3.3 測濕度電路 21
3.4 鍵盤 24
3.5 顯示LCD 24
3.6 上位機(jī)通信 25
3.7 本章小結(jié) 26
第4章 系統(tǒng)軟件設(shè)計(jì) 27
4.1 主程序設(shè)計(jì) 27
4.2 溫濕度檢測模塊 29
4.3 顯示報(bào)警模塊 30
4.4 本章小結(jié) 31
結(jié)論 32
致謝 33
參考文獻(xiàn) 34
附錄 37