【正文】 論 ........................................................................................................................ 1 選題背景 .................................................................................................................. 1 研究意義 .................................................................................................................. 1 國內(nèi)外相關(guān)技術(shù)概況 ............................................................................................... 2 氣壓計(jì)技術(shù)概況 .............................................................................................. 2 國內(nèi)外相關(guān)技術(shù) .............................................................................................. 3 本課題的重 點(diǎn)及難點(diǎn) ................................................................................................ 3 本課題相關(guān)理論及西安地區(qū)大氣壓 ........................................................................... 4 第 2 章 系統(tǒng)總體設(shè)計(jì) .......................................................................................................... 6 氣壓計(jì)結(jié)構(gòu) .............................................................................................................. 6 設(shè)計(jì)方案 .................................................................................................................. 7 方案一 ............................................................................................................ 7 方案二 ............................................................................................................ 7 系統(tǒng)總體結(jié)構(gòu) ........................................................................................................... 8 系統(tǒng)各功能模塊 ....................................................................................................... 8 初始化模塊 ..................................................................................................... 8 數(shù)據(jù)處理模塊 ................................................................................................10 數(shù)碼 顯示模塊 ................................................................................................10 警報電路模塊 ................................................................................................10 各功能模塊的選擇 ...................................................................................................10 單片機(jī)的選擇 ................................................................................................10 氣壓傳感器的選擇 ......................................................................................... 11 數(shù)碼顯示 的選擇 ............................................................................................. 11 蜂鳴器的選擇 ................................................................................................ 11 系統(tǒng)的配置 ............................................................................................................. 11 第 3 章 硬件電路的搭建 .......................................................................................................13 單片機(jī) ....................................................................................................................13 AT89S52 單片機(jī)簡介 ......................................................................................13 AT89S52 主要特性 .........................................................................................15 IV AT89S52 管腳說明 .........................................................................................15 單片機(jī)最小系統(tǒng) .............................................................................................16 氣壓傳感器 BMP085 ................................................................................................17 BMP085 主要特性 ..........................................................................................18 BMP085 發(fā)送控制命令方式 ............................................................................18 BMP085 讀取數(shù)據(jù)方式 ...................................................................................19 BMP085 控制程序總結(jié) ..................................................................................19 BMP085 電路結(jié)構(gòu) ..........................................................................................20 LCD 數(shù)碼顯示 .........................................................................................................20 1602 字符型 LCD 簡介 ...................................................................................20 1602LCD 的基本參數(shù)及引腳功能 ...................................................................21 1602LCD 的時序 ............................................................................................23 1602 電路結(jié)構(gòu) ...............................................................................................24 蜂鳴器 ....................................................................................................................25 總體電路顯示 ..........................................................................................................25 第 4 章 軟件的設(shè)計(jì) ............................................................................................................27 應(yīng)用軟件的介紹 ......................................................................................................27 Altium Designer 軟件介紹 ...............................................................................27 Keil 軟件介紹 ................................................................................................27 PROTEUS 軟件介紹 .......................................................................................27 氣壓與海拔的關(guān)系 ...................................................................................................28 程序流程圖 .............................................................................................................28 第 5 章 系統(tǒng)調(diào)試與經(jīng)驗(yàn)教訓(xùn) ..............................................................................................30 硬件調(diào)試 ............