【正文】 { _nop_()。 } if(dis0==dis1) //兩次結(jié)束數(shù)據(jù)比較，若相等 date=dis0。 ZD = 74 * sq(volt 105)。 i++。 delay(5)。 //數(shù)據(jù)轉(zhuǎn)換成 BCD碼 display()。s 21 win. Michel Platini, president of European football39。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個人的時候，自己的想法總是特別地清晰。ll be traveling fast, so despite the distance, it will not be 皖西學(xué)院本科畢業(yè)設(shè)計(jì) 第 30 頁 like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。s antiracism taskforce, is in London for the Football Association39。 LED_RD = 1。 TMP[2] = Temp % 10。 i++。 //取小數(shù)點(diǎn)后第一位 temp=temp%51。 _nop_()。 } Clk=0。 //拉高時鐘 _nop_()。 divisor = (root1) + 1。 //AD 值 uchar CH。 通過這次設(shè)計(jì)使自己對單片機(jī)的應(yīng)用得到了更深的認(rèn)識，另外傳感器的使用，程序的開發(fā)，顯示系統(tǒng)設(shè)計(jì)，復(fù)位電路設(shè)計(jì)，單片機(jī)接口設(shè)計(jì)，如何濾波，怎么樣選擇 A/D 轉(zhuǎn)換等都有了更好的提升。 圖 ADC0832 與單片機(jī)的接口電路 皖西學(xué)院本科畢業(yè)設(shè)計(jì) 第 14 頁 4 水質(zhì)監(jiān)測系統(tǒng)的軟件設(shè)計(jì) C 語言的特點(diǎn)和程序結(jié)構(gòu) 軟件設(shè)計(jì)就是用計(jì)算機(jī)所能接受的語言把所需解決問題的步驟逐一描述出來，也就是編制計(jì)算機(jī)的程序，在設(shè)計(jì)應(yīng)用系統(tǒng)時，軟件的編制是重要環(huán)節(jié)。 此傳感器具有量程寬、標(biāo)定過程簡單、功耗低、成本低、體積小等特點(diǎn)，該傳感器的另一個特點(diǎn)是在高渾濁度時分辨率比低渾濁度高，可滿足一些特殊的測量要求 [5]。單片機(jī)訪問一次存儲器的時間，稱為一個機(jī)器周期，作為單片機(jī)工作的時間基準(zhǔn)。 表 P3 口第二功能表 引腳號 第二功能 RXD（串行輸入） TXD（串行輸出） INT0 （外部中斷 0） INT1 （外部中斷 1） T0（定時器 0 外部輸入） T1（定時器 1 外部輸入） WR （外部數(shù)據(jù)存儲器寫選通） RD （外部數(shù)據(jù)存儲器寫讀選通） 單片機(jī)的最小系統(tǒng) 所謂最小系統(tǒng)，是指一個真正 可用的單片機(jī)的最小配置系統(tǒng)。與工業(yè) 80C51產(chǎn)品指令和引腳完全兼容。電阻率的單位為歐姆 Ⅱ類 主要反映地下水化學(xué)組分的天然背景含量。 水質(zhì)監(jiān)測的意義 第 一，了解污水水質(zhì)，為污水處理技術(shù)方案提供依據(jù)。 對水資源的保護(hù)成為一項(xiàng)重要的工程。 關(guān)鍵詞 :水質(zhì)監(jiān)測、 AT89C51單片機(jī)、數(shù)據(jù)采集、 A/D轉(zhuǎn)換、 水中自由離子濃度、 渾濁度、 傳感器 皖西學(xué)院本科畢業(yè)設(shè)計(jì) II Water quality monitoring system based on single chip design Abstract: now water pollution has bee a social topic closely, so the water quality monitoring has bee an important measures to protect water, I designed a model based on effective monitoring of water quality system. Monitoring for water quality monitoring is mainly free ion concentration in water and the turbidity of water. Design scheme is based on single AT89C51, the acquisition of water and water supply were collected by sensors to produce analog signal processing, and then through the analog signal into digital signal converter (A/D converter), after the change of signal is transmitted to MCU, MCU receives the signal after processed before display module display. Through this design can effectively draw the water turbidity, free ion concentration, to judge the water pollution situation! In this design, systematically introduces the principle of water quality monitoring, the hardware structure, working principle and its usage and function circuit design of each part Keywords: water quality monitoring, AT89C51 single chip microputer, data acquisition, A/D conversion, free ion concentration in water, turbidity, sensors 皖西學(xué)院本科畢業(yè)設(shè)計(jì) 目錄 ...........................................................................................................................................1 我國水質(zhì)監(jiān)測背景 .......................................................................................................1 國內(nèi)水質(zhì)監(jiān)測技術(shù)的現(xiàn)狀 ...........................................................................................1 水質(zhì)監(jiān)測的意義 ...........................................................................................................2 水質(zhì)監(jiān)測的監(jiān)測指標(biāo) ...................................................................................................2 2 水質(zhì)監(jiān)測的方法和原理 ...........................................................................................................4 水中自由離子濃度與水的導(dǎo)電率的相互關(guān)系 ...........................................................4 水的渾濁度的監(jiān)測原理 ...............................................................................................4 3 水質(zhì)監(jiān)測系統(tǒng)的硬件設(shè)計(jì) .......................................................................................................5 單片機(jī)的選擇 ...............................................................................................................5 單片機(jī)介紹 .........................................................................................................5 單片機(jī)的最小系統(tǒng) ............................................................................................7 復(fù)位電路和晶振電路 ...................................................................................................8 顯示電路設(shè)計(jì) ...............................................................................................................9 傳感器的選擇 ............................................................................................................. 11 A/D 轉(zhuǎn)換 ...................................................................................................................12 4 水質(zhì)監(jiān)測系統(tǒng)的軟件設(shè)計(jì) .......................................