【正文】 1 目 錄 1 緒論 ............................................................................................................................................ 3 設(shè)計(jì)背景 ............................................................................................................................ 3 溫、濕度檢測(cè)技術(shù)的發(fā)展和現(xiàn)狀分析 .................................................................................. 3 溫度檢測(cè)技術(shù) ........................................................................................................... 3 濕度檢測(cè)技術(shù) ........................................................................................................... 4 系統(tǒng)簡(jiǎn)介 ............................................................................................................................ 6 系統(tǒng)功能簡(jiǎn)介 ........................................................................................................... 6 系統(tǒng)設(shè)計(jì)簡(jiǎn)介 ........................................................................................................... 6 本章小結(jié) ............................................................................................................................ 7 2 方案選擇 ..................................................................................................................................... 8 控制模塊 ............................................................................................................................ 8 2. 2 輸入模塊 ........................................................................................................................... 8 2. 3 顯示模塊 ........................................................................................................................... 9 2. 4 數(shù)據(jù)采集模塊 .................................................................................................................... 9 溫度采集模塊 ........................................................................................................... 9 濕度采集模塊 ............................................................................................................10 本章小結(jié) ............................................................................................................................10 3 數(shù)字信號(hào)處理 ............................................................................................................................. 11 數(shù)字信號(hào)處理簡(jiǎn)介 ............................................................................................................. 11 數(shù)字濾波技術(shù)簡(jiǎn)介 ............................................................................................................. 11 數(shù)據(jù)濾波技術(shù)的實(shí)現(xiàn)意義 ......................................................................................... 11 數(shù)字濾波與模擬濾波的區(qū)別 ..................................................................................... 11 列舉三種數(shù)字濾波技術(shù)及在本文中的使用 ..........................................................................12 遞推平均濾波法 .......................................................................................................12 限幅濾波法 ..............................................................................................................12 限幅平均濾波法 .......................................................................................................12 本章小結(jié) ...........................................................................................................................13 4 硬件設(shè)計(jì) ....................................................................................................................................14 系統(tǒng)外圍器件介紹 .............................................................................................................14 74LS164 ..................................................................................................................14 74LS08 與門 ............................................................................................................15 CD4024 ...................................................................................................................15 AT24C02..................................................................................................................16 ADC0809.................................................................................................................17 硬件設(shè)計(jì)及原理圖 .............................................................................................................19 LCM1602 液晶顯示及驅(qū)動(dòng) .......................................................................................19 數(shù)據(jù)采集模塊 ..........................................................................................................20 串口通信模塊 ..........................................................................................................27 電源模塊： ..............................................................................................................28 報(bào)警電路 .................................................................................................................28 總設(shè)計(jì)硬件圖 ....................................................................................................................29 4． 4 本章小結(jié) ......................................................................................................................30 5 系統(tǒng)軟件設(shè)計(jì) .............................................................................................................................31 2 系統(tǒng)軟件框圖 ....................................................................................................................31 系統(tǒng)各模塊流程圖及部分程序 ...........................................................................................31 初使化程序 ..............................................................................................................31 矩陣鍵盤掃描 ..........................................................................................................32 溫濕度報(bào)警值設(shè)置模塊 .....