【正文】 39。 SHT 11 temperature and humidity sensor。 clock chip DS12887。 Digital circuit 目 錄摘 要 ...............................................................IABSTRACT .............................................................II目 錄 ...............................................................III第 1 章 緒論 .........................................................1 選題的目的和意義 ...............................................................................................1 自動澆花器的誕生背景及國內(nèi)外發(fā)展現(xiàn)狀 .......................................................1 畢業(yè)設計所采用的研究方法和手段 ...................................................................3第 2 章 AT89C52 單片機 ...............................................4 AT89C52 主要特性 ...............................................................................................4 管腳說明 ...............................................................................................................4 振蕩電路和時鐘 ...................................................................................................7 AT89C52 的中斷系統(tǒng) ...........................................................................................8 中斷系統(tǒng)結(jié)構(gòu)和中斷控制 ............................................................................8 中斷響應過程 ..............................................................................................11 定時器/計數(shù)器 ....................................................................................................11 定時器/計數(shù)器 0 和 1 簡介 ..........................................................................11 與定時器/計數(shù)器 0 和 1 相關的特殊功能寄存器 .....................................12第 3 章 復位及電源設計 .............................................................................................14 復位電路 .............................................................................................................14 DS1232 的結(jié)構(gòu)及特點 .................................................................................15. DS1232 的功能 ............................................................................................16. 使用注意事項 .............................................................................................17 電源電路 .............................................................................................................17 LM2576 的特性 ............................................................................................1外圍元件的選擇 ........................................................................................19第 4 章 溫濕度傳感器 .................................................................................................21 數(shù)字溫濕度傳感器 SHT11...............................................................................21 SHT11 的傳感器輸出 ........................................................................................22 濕度值輸出 ..................................................................................................23 溫度值輸出 ..................................................................................................24 露點計算 ......................................................................................................24 非線性校正及溫度補償 ..............................................................................25 SHT11 的特性 ....................................................................................................25 SHT11 的特點 .............................................................................................25 SHT 的詳細規(guī)格 ..........................................................................................26 SHT11 的引腳 ....................................................................................................27 SHT11 的的內(nèi)部命令與接口時序 ....................................................................27 SHT11 的內(nèi)部命令 .....................................................................................27 SHT11 的命令順序及命令時序 .................................................................28 SHT11 的狀態(tài)寄存器 .................................................................................29 硬件接口 .............................................................................................................30 恢復處理 .............................................................................................................30第 5 章 DS12887 時鐘芯片 .........................................................................................32 DS12887 時鐘芯片特點 .....................................................................................32 引腳 .....................................................................................................................32 命令字節(jié) .............................................................................................................36 DS12887 內(nèi)部 RAM 各專用寄存器地址功能 .........................................36 寄存器 A......................................................................................................37 寄存器 B ......................................................................................................38 寄存器 C ......................................................................................................39 硬件接口 .............................................................................................................40第 6 章 液晶顯示器 LCD............................................................................................41 液晶顯示器的分類 .............................................................................................41 OCMG12864 .....................................................................................................41 OCMG 12864 引腳功能 .............................................................................42 液晶主要器件介紹 ......................................................................................43 應用說明 ......................................................................................................44第 7 章 盆花自動澆水系統(tǒng)的設計 ...................