【正文】 動改變風扇電機的轉速檔位，同時用 LED 八段數碼管顯示檢測到的溫度與當前檔位。它的設計為現(xiàn)代社會人們的生活以 及生產帶來了諸多便利，在提高人們的生活質量、生產效率的同時還能節(jié)省風扇運轉所需的能量。 隨著單片機在各個領域的廣泛應用，許多用單片機作控制的溫度控制系統(tǒng)也應運而生，如基于單片機的溫控風扇系統(tǒng)。s life and production. The design of a temperature controlled fan system, sensitive temperate easuing and display, the system uses STC89C51 microcontroller as the control platform to control the speed of the fan. The realtime temperature using DS18B20 digital temperature sensor, SCM processing through the transistor DCfan motor drive. According to the realtime temperature acquisition, the fan selfstop. High, low temperature value set by the user, the measured temperaturevalues in the high and low temperature between open fan weak wind profile,when the temperature exceeds the set temperature automatically switch to thefile, automatically turn off the fan when the temperature is lower than the set temperature, the control state varies with the outside temperature. KEY WORDS: Temperature control fan, MCU, DS18B20,automatic control III 目 錄 前 言 ....................................................................................................... 1 第 1 章 緒論 ............................................................................................ 2 研究本課題的目的和意義 ....................................................... 2 發(fā)展現(xiàn)狀 .................................................................................... 2 第 2 章 整體方案選擇 ............................................................................ 4 溫度傳感器的選用 .................................................................... 4 主控機的選擇 ............................................................................ 6 顯示電路 ..................................................................................... 6 調速方式 ..................................................................................... 7 第 3 章 系統(tǒng)硬件組成 ............................................................................ 8 系統(tǒng)結構 .................................................................................... 8 主控芯片介紹 ............................................................................ 8 STC89C51 簡介 ............................................................... 8 STC89C51 主要功能和性能參數 .................................... 9 STC89C51 單片機引腳說明 ......................................... 10 STC89C51 單片機最小系統(tǒng) ........................................... 12 STC89C51 中斷技術概述 ............................................... 14 DS18B20 溫度采集電路 .......................................................... 14 DS18B20 的特點及內部構造 ........................................ 14 DS18B20 的工作原理 ..................................................... 16 DS18B20 的工作時序 ..................................................... 19 數碼管驅動顯示電路 ............................................................. 21 數碼管驅動電路 ........................................................... 21 數碼管顯示電路 ........................................................... 22 風扇驅動電路 .......................................................................... 23 按鍵模塊 .................................................................................. 26 第 4 章 系統(tǒng)軟件設計 .......................................................................... 28 軟件介紹 .................................................................................. 28 IV Keil C51 .......................................................................... 28 Protel99SE ...................................................................... 29 Proteus ............................................................................. 30 主程序流程圖 .......................................................................... 32 DS18B20 子程序流程圖 .......................................................... 33 數碼管顯示子程序流程圖 ..................................................... 34 按鍵子程序流程圖 .................................................................. 35 第 5 章 系統(tǒng)調試 .................................................................................. 37 軟硬件調試 .............................................................................. 37 按鍵顯示部分的調試 ................................................... 37 傳感器 DS18B20 溫度采集部分調試 ........................ 37 風扇調速電路部分調試 ............................................... 38 系統(tǒng)功能 .................................................................................. 38 系統(tǒng)實現(xiàn)的功能 ........................................................... 38 系統(tǒng)功能分析 ............................................................... 39 結 論 ..................................................................................................... 40 謝 辭 ....................................................................................................... 41 參考文獻 ................................................................................................. 42 附 錄 ..................................................................................................... 43 附錄 1： protel 原理圖 ................................................................... 43 附錄 2： proteus 仿真圖 ................................................................. 44 附錄 3：源程序 .............................................................................. 45 外文資料譯文 ........................................................................................ 52 1 前 言 在現(xiàn)代社會中，風扇被廣泛的應用，發(fā)揮著舉足輕重的作用，如夏天人們用的散熱風扇、工業(yè)生產中大型機械中的散熱風扇以及現(xiàn)在筆記本電腦上廣泛使用的智能 CPU 風扇等。 in the industrial production, is used toheat the electric fan large machinery. With the continuous development of thetechnology of temperature control, temperature controlled electric fan emerge as the times require gradually into people39?？捎捎脩粼O置高、低溫度值，測得溫度值在高低溫度之間時打開風扇弱風檔，當溫度升高超過所設定的溫度時自動切換到大風檔，當溫度小于所設定的溫度時自動關閉風扇，控制狀態(tài)隨外界溫度而定。利用 DS18B20 數字溫度傳感器采集實時溫度，經單片機處理后通過 三極管驅動直流風