【正文】 C=150PF， fCLK≈640KHZ ，轉(zhuǎn)換速度為 100μ ｓ。所以 ADC0804 的轉(zhuǎn)換存取速度更快，這樣系統(tǒng)的工作效率更高。 2. 掌握 ADC， RS232 電平轉(zhuǎn)換電路的原理，壓力傳感器 的特性參數(shù)的計(jì)算 及選擇。 關(guān)鍵詞 ： 智能液位傳感器，單片機(jī)， AD 轉(zhuǎn)換器 2 西華大學(xué)電氣信息學(xué)院智能化測控應(yīng)用系統(tǒng)設(shè)計(jì)報(bào)告 Abstract： This article introduces the application of pressure sensor, and designs a intelligent level sensor. This design detects the liquid pressure through the pressure sensors, and it will send the voltage from 0 to 5V which is converted into digital quantity by the simulation ADC0804 acquisition to the SCM processing. Then the digital will be sent to the PC which shows the high by RS232 serial interface munication. This design can finish 0 to m high level measurement, and accurate to cm. This design main have pressure sensor, a singlechip microputer, and ADC0804 converter to form. Keywords： Intelligence level sensor ， Singlechip microputer， AD converter 3 西華大學(xué)電氣信息學(xué)院智能化測控應(yīng)用系統(tǒng)設(shè)計(jì)報(bào)告 目 錄 1緒論 .............................................................. 5 設(shè)計(jì)目的 ....................................................... 6 設(shè)計(jì)任務(wù)與要求 ................................................... 6 智能液位傳感器的基本原理 ......................................... 6 2總體方案設(shè)計(jì) ...................................................... 7 智能液位傳感器設(shè)計(jì)方案框圖 ....................................... 7 方案論證 ......................................................... 8 方案可能的擴(kuò)展功能 ............................................... 9 3 單元模塊電路的設(shè)計(jì) ............................................... 10 各單元模塊功能介紹及電路設(shè)計(jì) ..................................... 10 傳感器輸出部分 ............................................ 10 ADC0804 數(shù)據(jù)采集轉(zhuǎn)化部分 ................................... 10 單片機(jī)最小系統(tǒng)模塊 ........................................ 11 RS232 模塊 ................................................. 12 電路參數(shù) 計(jì)算及元器件的選擇 ...................................... 13 元器件的選擇 .............................................. 13 特殊元器件介紹 .................................................. 14 ADC0804 ................................................... 15 壓力傳感器 D3B ............................................. 17 個(gè)單元模塊的聯(lián)接 ................................................ 18 4 軟件設(shè)計(jì) ......................................................... 20 4． 1 軟件設(shè)計(jì)原理及所用的工具 ....................................... 20 單片機(jī)部分 ................................................ 20 上位機(jī) VB部分 ............................................. 21 軟件的設(shè)計(jì)流程框圖 .............................................. 23 軟件設(shè)計(jì)總結(jié) .................................................... 24 5 系統(tǒng)調(diào)試 ......................................................... 25 硬件結(jié)構(gòu)部分 .................................................... 25 VB 部分 .......................................................... 25 壓力傳感器部分 .................................................. 26 6 系統(tǒng)功能及指標(biāo)參數(shù) ............................................... 27 系統(tǒng)功能 ......................................................... 27 4 西華大學(xué)電氣信息學(xué)院智能化測控應(yīng)用系統(tǒng)設(shè)計(jì)報(bào)告 系統(tǒng)各部分的測試參數(shù) ............................................ 27 AD 部分調(diào)試參數(shù) ............................................ 27 系統(tǒng)測量液面高度的數(shù)據(jù)參數(shù) ................................ 28 調(diào)試總結(jié) .................................................. 28 7 結(jié)論 ............................................................ 30 8 總結(jié)與體會(huì)及感謝語 ............................................... 31 9 參考文獻(xiàn) ......................................................... 32 附錄 .............................................................. 33 附錄 1： ............................................................. 33 附錄 2：程序 ......................................................... 36 附錄 3 元器件清單 .................................................... 39 5 西華大學(xué)電氣信息學(xué)院智能化測控應(yīng)用系統(tǒng)設(shè)計(jì)報(bào)告 1 緒論 液位檢測在許多控制領(lǐng)域已較為普遍，各種類型的液位檢測傳感器較多，按原理分有浮子式、壓力式、超聲波式、吹氣式等。通過本課程設(shè)計(jì)可以掌握和鞏固傳感器的基本設(shè)計(jì)方法，工業(yè) 水位的測量方法，單片機(jī)的基本應(yīng)用，顯示電路的連接等知識(shí)。下面我將首先對這兩種種方案的組成框圖和實(shí)現(xiàn)原理分別進(jìn)行說明。 傳感器輸出部分 ADC0804 數(shù)據(jù)采集轉(zhuǎn)化部分 該級(jí)電路一共實(shí)現(xiàn)了兩個(gè)功能：第一個(gè)是對模擬電壓信號(hào)的采集。在典型 應(yīng)用 fCLK＝ 640KHZ 時(shí)，轉(zhuǎn)換時(shí)間約為 103μ ｓ～ 114μ ｓ。 該程序部分設(shè)計(jì)過程中使用的是 keil 軟件來編寫的，利用 STCISP 軟件進(jìn)行下載和調(diào)試的。//模式 1， 8位數(shù)據(jù)，波特率由軟件設(shè)置 21 西華大學(xué)電氣信息學(xué)院智能化測控應(yīng)用系統(tǒng)設(shè)計(jì)報(bào)告 SM1=1。比如像我們這次的設(shè)計(jì)就出現(xiàn)過這樣的問題，在焊接完單片機(jī)最小系統(tǒng)和 RS232串口通信后覺得因該能下載程序到單片機(jī)內(nèi)部了，結(jié)果利用直流可調(diào)的穩(wěn)壓電源給單片機(jī)加了 +5V 的工作電壓結(jié)果單片機(jī)不能工作。 測得的數(shù)據(jù)如下圖 : 圖 液面高度的測量數(shù)據(jù) 這些數(shù)據(jù)都是在室內(nèi)測得的，在室溫 30 度左右測得。通過畫程序方框圖可以使我們對所要完成的每一步任務(wù)都有一個(gè)很清楚的思路，讓我們明白每一步的任務(wù)，同時(shí)在程序測試的過程中也有利于查錯(cuò)。y0。//串口始能 REN=1 時(shí)允許串行口接收數(shù)據(jù) SM0=0。打開串口 End Sub Private Sub Command10_Click() End End Sub Private Sub Form_Load() 39。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(gè)人的時(shí)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 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 43 西華大學(xué)電氣信息學(xué)院智能化測控應(yīng)用系統(tǒng)設(shè)計(jì)報(bào)告 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