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南昌航空大學(xué)科技學(xué)院 2020 屆學(xué)士學(xué)位論文 1 智能烘箱溫度控制器設(shè)計(jì) 學(xué)生姓名 姚溪 班級(jí) 098205234 指導(dǎo)老師 陳黎娟 摘要 : 電烘箱在機(jī)械、冶金、化工等行業(yè)具有廣泛的應(yīng)用,如機(jī)械零件的熱處理。在某些情況下,要求對(duì)電烘箱的溫度實(shí)現(xiàn)準(zhǔn)確控制,若采用一般控制方法則難以實(shí)現(xiàn)。 以鉑熱電阻溫度傳感器 PT100 作為感應(yīng)烘箱溫度傳感器,它將溫度的變化轉(zhuǎn)換為電阻阻值的變化,由鉑熱電阻 PT100 組成的測(cè)量電橋?qū)⒑嫦錅囟鹊淖兓D(zhuǎn)換成電壓信號(hào)變換、再經(jīng)集成運(yùn)放 7650 放大成 0~ 5V 的模擬電壓信號(hào)后,經(jīng)ADC0804 轉(zhuǎn)換成 8 位數(shù)字信號(hào)送入 AT89C52 單片機(jī)系統(tǒng), AT89C52 單片機(jī)對(duì)所采集的數(shù)據(jù)經(jīng)數(shù)字濾波、變換等處理后送入 164 顯示模塊進(jìn)行顯示,同時(shí)輸出控制量,控制可控硅的導(dǎo)通從而控制加熱裝置開啟或關(guān)閉,實(shí)現(xiàn)對(duì)烘箱溫度的智能控制。 本次設(shè)計(jì)所要求實(shí)現(xiàn)的溫度測(cè)量范圍為 0℃~ 300℃,分辨率為177。 1℃。測(cè)量結(jié)果用 3 位 LED 數(shù)碼管顯示。 設(shè)計(jì)中利用 STC89C52系列單片機(jī)實(shí)現(xiàn)了實(shí)時(shí)溫度采樣、智能控制,有較高的實(shí)用價(jià)值;此外,采用 數(shù)碼 顯示和鍵盤輸入實(shí)現(xiàn)了“人機(jī)對(duì)話”,充分滿足了使用者對(duì)于產(chǎn)品使用便捷直觀的要求。 關(guān)鍵字 :溫度傳感器、 A/D 轉(zhuǎn)換 、實(shí)時(shí) 測(cè)溫 指導(dǎo)教師簽字 : 南昌航空大學(xué)科技學(xué)院 2020 屆學(xué)士學(xué)位論文 2 The development of Intelligent Oven System Student Name: Yaoxi Classe: 098205234 Supervisor: Chenlijuan Abstract : Electric oven in the machinery, metallurgical, chemical and other industries has a wide range of applications, such as mechanical certain circumstances, the oven temperature is reguired to achieve accuratecontrol,such as the general control methods will be difficult to achieve. Platinum resistance to heat as the temperature sensor PT100 sensors oven temperature sensitive ponents, It will change the temperature of the resistance to the resistance changes, Platinum by the thermal resistance of Surfacing Bridge will be measured temperature of the oven converted into voltage signal conversion, then integrated operational amplifier 7650 enlarge 0 ~ 5V voltage signal simulation. After ADC0804 converted into eight digital signal into AT89C52 system, AT89C52 of the data collected by digital filtering, After processing transform into 164 Module for, and determine whether the effective temperature range beyond, thus pleting the measurement of temperature. The design calls for the temperature measurement range of 0 176。 C to 300 176。 C, resolution of 177。 1 176。 C. Measurement results using three digital LED Display. Design Series MCU STC89C52 use realtime temperature sampling, intelligent control, have high practical value。 In addition, the use of digital display and keyboard input of the manmachine dialogue fully meet the users for the products easy to use visual requirements. Keywords : temperature sensor, A / D conversion, realtime temperature measurement signature of instructor : 南昌航空大學(xué)科技學(xué)院 2020 屆學(xué)士學(xué)位論文 3 目 錄 第一章 緒論 .......................................................................................................... 1 選題的依據(jù)及課題的意義 ............................................................................. 1 國(guó)內(nèi)外研究概況及發(fā)展趨勢(shì) ......................................................................... 1 本文的主要研究?jī)?nèi)容 ..................................................................................... 2 第二章 烘箱系統(tǒng)的組成及工作原理 .......................................................... 3 系統(tǒng)的設(shè)計(jì)要求與技術(shù)指標(biāo) ......................................................................... 3 系統(tǒng)組成框圖與功能分析 .............................................................................. 3 第三章 烘箱系統(tǒng)硬件電路的設(shè)計(jì) ............................................................... 5 單片機(jī)最小系統(tǒng) ............................................................................................. 5 時(shí)鐘電路 .............................................................................................. 5 復(fù)位電路 .............................................................................................. 5 溫度 采集放大 電路 ......................................................................................... 7 A/D 轉(zhuǎn)換電路設(shè)計(jì) ....................................................................................... 10 鍵盤、顯示接口電路 ................................................................................... 12 LED 顯示接口電路 ............................................................................. 12 鍵盤接口電路 .................................................................................... 13 加熱控制電路 ............................................................................................... 15 報(bào)警電路 ....................................................................................................... 16 第四章 烘箱系統(tǒng)軟件設(shè)計(jì) ............................................................................ 18 軟件設(shè)計(jì)總體框圖 ................................................................................ 18 系統(tǒng)子程序設(shè)計(jì) .................................................................................... 19 A/D 轉(zhuǎn)換子程序 ................................................................................ 19 顯示 程序 ............................................................................................. 21 鍵盤輸入程序 ....................................................................... 22 第五章 系統(tǒng)調(diào)試 ................................................................................................ 23 單片機(jī)系統(tǒng)調(diào)試 .................................................................................... 23 溫度采集電路的調(diào)試 ............................................................................ 23 顯示電路的調(diào)試 ..................................................................................... 23 第六章 結(jié)論 .......................................................................................................... 25 實(shí)現(xiàn)功能 .................................................................................. 25 南昌航空大學(xué)科技學(xué)院 2020 屆學(xué)士學(xué)位論文 4 不完善之處 ..............................................................