【正文】 ilization, new problems, new challenges also e one after another, such as city traffic congestion, caused by vehicle exhaust pollution and traffic accident and so on. These problems are affecting and even endanger the normal life of people. As will enter the society of university graduates, as the new century appearance, as the cause of socialism practice, we should actively their knowledge and practical problems bining the actual challenge, solving practical problems, the benefit of the broad masses of the people.Drunk driving is causing a major cause of road accidents,2011,May01, concern about the criminal law amendment ( eight) and the revised law of road transportation safety was officially implemented, drunk driving is just as criminal offenses punishable by 6months, the highest criminal detention and a fine of 2000 yuan.This design is the design of alcohol concentration detector, design products to vapors in breath alcohol concentration realtime acquisition, display, alarm. The finished product can be used for traffic police to motorists to testing and supervision, can also be used for the drivers before self detection.The design of the micro control unit MCU choose STC pany STC89C52MCU, sensor selection of MQ 3alcohol concentration sensor. The system will consist of the MQ 3alcohol concentration sensor output current with the amplifying and filtering and other functions of the conditioning circuit, input to the A / D conversion chip as the core ADC0804conversion circuit converts the eight bit digital signal, then the MCU processing, ultimately into the LCD display. The realtime detection of the alcohol concentration and realize the value of alarm function. Considering the MQ 3alcohol concentration sensor warmup time is longer, power system automatically enter the standby state, the work also can be controlled through the buttons to enter the standby state, a standby state system without alcohol concentration acquisition, display and alarm, but to the sensor preheating and displayed within ten minutes of the simple timing, let users grasp the preheating time. A standby state can also be readily through the button to enter the working state.This paper introduces in detail the acquisition, conversion, alcohol concentration display, alarm and standby work principle, work process, hardware system and software realization method.Key words: MCU。MQ3酒精濃度傳感器；ADC0804AbstractSince the new century, China 39。關(guān)鍵詞：MCU。待機(jī)狀態(tài)中也可隨時(shí)通過按鍵進(jìn)入工作狀態(tài)。系統(tǒng)將由MQ3酒精濃度傳感器輸出的微弱電流經(jīng)具有放大濾波等功能的調(diào)理電路后，輸入以模數(shù)轉(zhuǎn)換芯片ADC0804為核心的轉(zhuǎn)換電路轉(zhuǎn)換為八位數(shù)字信號(hào)，再由單片機(jī)進(jìn)行處理，最終送入LCD液晶顯示屏顯示實(shí)時(shí)檢測(cè)的酒精濃度以及實(shí)現(xiàn)超值報(bào)警功能。成品可用于交警對(duì)汽車駕駛者測(cè)試與監(jiān)督，也可以用于司機(jī)駕車前的自我檢測(cè)。酒駕正是造成交通事故的重要原因，2011年05月01日，備受關(guān)注的《刑法修正案(八)》和修改后的《道路交通安全法》正式施行，酒駕被正是列為刑事犯罪，最高可處以6個(gè)月的刑事拘留和2000元罰款。這些問題正在影響甚至危害著人們的正常生活。目錄中文摘要 IAbstract II1 緒論 1 呼吸氣體酒精濃度檢測(cè)報(bào)警儀開發(fā)背景 1 1 22 單片機(jī)最小系統(tǒng)介紹 3 STC89C52簡介 3 復(fù)位電路介紹 5 晶振電路介紹 63 信號(hào)采集和AD轉(zhuǎn)換過程的軟硬件設(shè)計(jì) 7 MQ3酒精濃度傳感器模塊簡介 7 AD轉(zhuǎn)換軟硬件件設(shè)計(jì) 8 ADC0804簡介 8 本設(shè)計(jì)中ADC0804外圍硬件連接 10 本設(shè)計(jì)中AD轉(zhuǎn)換軟件實(shí)現(xiàn) 114 顯示模塊軟硬件設(shè)計(jì) 13 LCD1602簡介 13 本設(shè)計(jì)中LCD1602的硬件連接介紹 14 本設(shè)計(jì)中LCD1602的軟件設(shè)計(jì) 14 本設(shè)計(jì)的液晶寫命令子函數(shù)和寫數(shù)據(jù)子函數(shù)程序分析 14 本設(shè)計(jì)中用到的液晶指令介紹 16 本設(shè)計(jì)中的字符串顯示和數(shù)據(jù)實(shí)時(shí)更新的實(shí)現(xiàn)方法 165. 其它外圍設(shè)備軟硬件設(shè)計(jì) 19 報(bào)警電路軟硬設(shè)計(jì) 19 硬件部分設(shè)計(jì) 19 軟件部分設(shè)計(jì) 19 待機(jī)指示燈軟硬件設(shè)計(jì) 20 硬件部分設(shè)計(jì) 20 軟件部分設(shè)計(jì) 20 按鍵軟硬件設(shè)計(jì) 20 硬件部分設(shè)計(jì) 21 軟件部分設(shè)計(jì) 21 電源電路 226．系統(tǒng)總體設(shè)計(jì) 23 硬件總體框圖 23 程序流程圖 24 硬件調(diào)試 25 軟件調(diào)試 25 標(biāo)志數(shù)的應(yīng)用 25 按鍵的消抖與松手檢測(cè)的程序?qū)崿F(xiàn) 26 定時(shí)器與定時(shí)器中斷 27結(jié)束語 28致謝 29參考文獻(xiàn) 30附錄一 硬件設(shè)計(jì)原理圖 31附錄二 實(shí)物照片 32附錄三 程序 33中文摘要新世紀(jì)以來，中國的經(jīng)濟(jì)不斷發(fā)展，人民生活水平不斷提高，私家車逐漸走進(jìn)千家萬戶，給人們的生活帶來了極大的便利。然而高速文明的背后，新的問題、新的挑戰(zhàn)也接踵而至，例如城市交通擁堵，汽車尾氣造成的嚴(yán)重環(huán)境污染以及交通事故等等。作為即將步入社會(huì)的大學(xué)畢業(yè)生，作為新世紀(jì)四有青年，作為社會(huì)主義事業(yè)的踐行者，我們應(yīng)當(dāng)積極將自己所學(xué)知識(shí)與實(shí)際問題實(shí)際挑戰(zhàn)相結(jié)合，解決實(shí)際問題，造福廣大人民。本設(shè)計(jì)正是設(shè)計(jì)酒精濃度檢測(cè)儀，設(shè)計(jì)成品可以對(duì)呼吸氣體中的酒精濃度進(jìn)行實(shí)時(shí)采集，顯示，報(bào)警。本設(shè)計(jì)的微控制單元MCU選擇的是STC公司生產(chǎn)的STC89C52單片機(jī)，傳感器則選用MQ—3酒精濃度傳感器?？紤]到MQ—3酒精濃度傳感器的預(yù)熱時(shí)間較長，系統(tǒng)上電后自動(dòng)進(jìn)入待機(jī)狀態(tài)，在工作時(shí)也可以隨時(shí)通過按鍵控制進(jìn)入待機(jī)狀態(tài)，待機(jī)狀態(tài)中系統(tǒng)不進(jìn)行酒精濃度采集、顯示和報(bào)警，而是給傳感器預(yù)熱并顯示十分鐘以內(nèi)的簡易計(jì)時(shí)，讓使用者大致掌握預(yù)熱時(shí)間。本文詳細(xì)介紹了酒精濃度采集、轉(zhuǎn)換、顯示、報(bào)警以及待機(jī)的工作原理，工作過程，硬件子系統(tǒng)和軟件實(shí)現(xiàn)方法。STC89C52。s economic development, people39。 STC89C52。 ADC08041 緒論 呼吸氣體酒精濃度檢測(cè)報(bào)警儀開發(fā)背景我國經(jīng)濟(jì)、科技正在迅速騰飛，汽車早已進(jìn)入尋常百姓家。酒精有使神經(jīng)系統(tǒng)鎮(zhèn)定松弛的作用，但也會(huì)成抑制力明顯減弱，可能造成酒后暴力行為。據(jù)科學(xué)實(shí)驗(yàn)表明，飲酒后對(duì)交通燈的反應(yīng)慢，轉(zhuǎn)向急速駕車搖擺不定，違法轉(zhuǎn)彎和急速轉(zhuǎn)彎等行為發(fā)生概率大大增大。2011年05月01日，我國正式將酒駕列為刑事犯罪。燃料電池型、半導(dǎo)體型、氣體色譜分析型、比色型、紅外線型是呼吸氣體酒精濃度測(cè)報(bào)警儀的五種最基