【正文】 的特點(diǎn)，在工業(yè)控制的實(shí)踐中得到越來越廣泛的應(yīng)用 。 課題研究的目的及意義 目前市場(chǎng)上家用燃?xì)忮仩t 大部分 為進(jìn) 口，價(jià)格 較 高，售后服務(wù) 也 不夠完善，不利于燃?xì)忮仩t的推廣 與 使用，研制燃?xì)忮仩t的 企業(yè)與公司也 相對(duì)較少。隨著計(jì)算機(jī)和信息技術(shù)的高速發(fā)展， 單片機(jī) 廣泛的應(yīng)用于工業(yè)控制中。由于加熱元件工作由外部電氣開關(guān)控制，所以啟停速度快。不需要布管路，沒有燃燒室、煙 道，不會(huì)出現(xiàn)燃煤、燃油、燃?xì)獾男孤┖捅ㄎｋU(xiǎn)。 2） 無污染。Liquid CrystalDisplay。 關(guān)鍵詞 ： 單片機(jī)； 溫度控制 ； DS18B20； 燃?xì)忮仩t ； LCD； 安徽建筑 大學(xué) 畢業(yè)設(shè)計(jì)（論文） ABSTRACT According to the market demand and the characteristics of domestic heating, this paper develops MCU intelligence controller for the minor gasfired boiler which is domestic heating equipment on the basis of investigation of heating demand widely. The research purpose is to change the inconvenience of temperature control bring by using coal fired boiler for centralized heating, to increase economics of software called Protel99se for circuit designed is used to develop the hardware of the controller. The hardware includes the power supply circuit, the reset circuit,the clock circuit, the alarm circuit, the LCD display circuit, and the temperature collection which is the core of this controller. The threepin integratedcircuit voltage regulator W7800 (7900) series ponent 7805 is used for the power supply. The Atmel AT89S51 chip is the core chip of the controller. The integrated temperature sensor DS18B20 is used to measure water temperature in boiler. The key circuit is used to set the alerm temperature and analog water in or out. In addition, LCD is used to display water level bound, current water level, temperature alerm value by presupposition and current temperature. When water level beyond its bound or when current temperature beyond its alerm value, the system gives an alerm and makes boiler burner off. When water temperature is down, the system releases alerm and makes boiler burener on. The system does it again and the system can save energy and improve energy utilization rate. Aim at the demand and characteristic of the system, on the basis of these hardware and implement method, using assemble language, system designs boiler temperature control system design based on singlechip. This software includes temperature and water level monitor main program, temperature collection subprogram, analoy water in and out subprogram, keyboard scan subprogram, LCD display subprogram etc. Keywords:MCU。等待溫度降到下限值，這時(shí)就可以重新鍋爐燃燒器通電，繼續(xù)加溫，如此反復(fù)監(jiān)控溫度。利用 Protel99se 軟件 設(shè)計(jì)電路 ，對(duì)智能控制器的電源電路、報(bào)警電路、時(shí)鐘電路、復(fù)位電路、 LCD 液晶顯示電路以及控制器的核心 — 溫度采集電路進(jìn)行了設(shè)計(jì)。電源采用三端集成穩(wěn)壓器 W7800 (W7900)系列元件 7805,交流 220 v電壓轉(zhuǎn)換為單片機(jī)所需要的 5V電壓；利用 AT89S51 作為控制器的核心器件；利用集成電路溫度傳感器 DS18B20 測(cè)量鍋爐水溫 。這樣就可以提高能源的使用率 ， 節(jié)約能源。 Temperature control。 安徽建筑 大學(xué) 畢業(yè)設(shè)計(jì)（論文） 目 錄 1 緒論 ....................................................................................................................................1 課題背景 ................................................................ 1 ..................................................... 2 ....................................................... 2 2 系統(tǒng)方案選擇及工作原理 ......................................................................................................4 系統(tǒng)設(shè)計(jì)方案 ............................................................ 4 系統(tǒng)結(jié)構(gòu)框圖 ............................................................ 5 ..................................................... 7 輔助器件選擇 ....................................................... 7 3 硬件電路設(shè)計(jì) ........................................................................................................................8 主控單片機(jī) AT89S51芯片介紹 ............................................... 8 主要性能特點(diǎn) ....................................................... 8 AT89S51管腳說明 ................................................... 9 單片機(jī)最小系統(tǒng) ......................................................... 11 圖 最小單片機(jī)系統(tǒng) ................................................... 11 .......................................................... 11 復(fù)位電路 ......................................................... 12 溫度控制電路 設(shè)計(jì) ....................................................... 12 ............................................................ 13 水位檢測(cè)電路設(shè)計(jì) ....................................................... 13 穩(wěn)壓電源電路設(shè)計(jì) ....................................................... 14 ............................................ 16 DS18B20簡(jiǎn)介 ...................................................... 16 ...................................................... 17 ................................................................ 17 固態(tài)繼電器 SSR .................................................... 17 ...................................................... 19 .................................................. 19 4 系統(tǒng)軟件的設(shè)計(jì) .................................................................................................................. 22 系統(tǒng)主程序 ............................................................. 22 子模塊軟件設(shè)計(jì) ......................................................... 22 A/D轉(zhuǎn)換環(huán)節(jié)子程序設(shè)計(jì) ............................................ 23 DS18B20溫度采集子程序設(shè)計(jì) ........................................ 24 LCD液晶顯示子程序設(shè)計(jì) ............................................ 25 按鍵子程序設(shè)計(jì) .................................................... 25 總結(jié) ....................................................................................................................................... 27 參考文獻(xiàn) ................................................................................................................................ 28 致 謝 ..................................................................................................................................... 29 附錄一 ................................................................................................