【正文】 ue from the LCD display. This paper describes the data acquisition subsystem, data processing and data display subsystem and alarm circuit design methods and processes. System requirements for the sampling sites exceeding the alcohol concentration diode reminder alarm circuit monitors. Meanwhile, the operator specific alarm point for the upper limit set by MCU programming. Alcohol tester will bring a driving signal prior to a safe Key words:Alcohol concentration sensor (MQ3)。 A / D converter。Hardware design 桂林電子科技大學(xué)畢業(yè)設(shè)計(jì)（論文 ）報(bào)告紙 目 錄 引言 ........................................................... 1 1. 緒論 ....................................................... 2 酒精濃度檢測(cè)儀開發(fā) 背景 .............................................................................................. 2 酒精濃度檢測(cè)儀的發(fā)展 .................................................................................................. 2 酒精濃度檢測(cè)儀設(shè)計(jì)內(nèi)容 .............................................................................................. 2 2. 方案器件簡(jiǎn)介 ................................................ 3 MCU 選擇的簡(jiǎn)介 ............................................................................................................ 3 數(shù)模轉(zhuǎn)換器的簡(jiǎn)介 .......................................................................................................... 5 時(shí)鐘芯片的 簡(jiǎn)介 .............................................................................................................. 7 液晶顯示器的簡(jiǎn)介 .......................................................................................................... 8 3 總體 方案設(shè)計(jì) ................................................ 9 STC89C52 單片機(jī) ............................................................................................................ 9 ADC0832 數(shù)模轉(zhuǎn)換 ....................................................................................................... 10 AT24C02 存儲(chǔ)器 ............................................................................................................ 10 LCD1602 液晶顯示 ........................................................................................................ 10 編譯軟件介紹 ................................................................................................................ 12 4 硬件設(shè)計(jì) ................................................... 13 最小系統(tǒng)的實(shí)現(xiàn) ............................................................................................................ 13 數(shù)據(jù)采集設(shè)計(jì) ................................................................................................................ 15 A/D 轉(zhuǎn)換設(shè)計(jì) ................................................................................................................. 16 按鍵設(shè)計(jì) ........................................................................................................................ 16 外圍擴(kuò)充存儲(chǔ)器電路 .................................................................................................... 17 時(shí)鐘芯片電路 ................................................................................................................ 18 LCD1602 液晶顯示設(shè)計(jì) ................................................................................................ 19 報(bào)警設(shè)計(jì) ........................................................................................................................ 20 電源電路設(shè)計(jì) ................................................................................................................ 21 5. 軟件設(shè)計(jì) .................................................. 22 編譯語(yǔ)言的選擇 ............................................................................................................ 22 主程序模塊 .................................................................................................................... 22 A/D 轉(zhuǎn)換模塊 ................................................................................................................. 23 按鍵輸入模塊 ................................................................................................................ 23 桂林電子科技大學(xué)畢業(yè)設(shè)計(jì)（論文 ）報(bào)告紙 時(shí)鐘模塊 ........................................................................................................................ 24 液晶顯示輸出模塊 ........................................................................................................ 25 外圍存儲(chǔ)模塊 ................................................................................................................ 27 6. 系統(tǒng)調(diào)試 ................................................... 28 系統(tǒng)硬件調(diào)試 ................................................................................................................ 28 .......................................................................................................... 28 .................................................................................................................. 28 系統(tǒng)軟件調(diào)試 ................................................................................................................ 28 系統(tǒng)整體調(diào)試 ................................................................................................................ 29 7. 結(jié)束語(yǔ) .................................................... 29 謝 辭 ........................................................ 30 參考文獻(xiàn) ...................................................... 31 附 錄 ........................................................ 32 附錄一 硬件設(shè)計(jì)仿真圖 ..................................................................................................... 32 附錄二 硬件設(shè)計(jì)原理圖和 PCB 圖 ..................................................................................... 33 附錄三 檢測(cè)程序 ................................................................................................................. 34 桂林電子科技大學(xué)畢業(yè)設(shè)計(jì)（論文）報(bào)告紙 第 1 頁(yè) 共 57 頁(yè) 引言 隨著中國(guó)經(jīng)濟(jì)的高速發(fā)展，人民生活水平的迅速提高，中國(guó)逐漸步入“汽車社會(huì)”，酒后駕駛行為所造成事故越來(lái)越多，對(duì)社會(huì)的影響也越來(lái)越大，酒精正在成為越來(lái)越兇殘的“馬路殺手”。此外，由交通事故造成的經(jīng)濟(jì)損失也相當(dāng)驚人