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轉(zhuǎn)速表計數(shù)器的設(shè)計制作畢業(yè)論文-資料下載頁

2025-06-19 13:43本頁面
  

【正文】 輸出端到正電源一般要接一個電阻(稱為上拉電阻,選315K)。選不同阻值的上拉電阻會影響輸出端高電位的值。因?yàn)楫?dāng)輸出晶體三極管截止時,它的集電極電壓基本上取決于上拉電阻與負(fù)載的值。另外,各比較器的輸出端允許連接在一起使用。 結(jié) 論本次設(shè)計的軟件編程和硬件調(diào)試工作是同步進(jìn)行的,以免最后出現(xiàn)錯誤無從下手,編出一個模塊的程序便到相應(yīng)的硬件電路上進(jìn)行調(diào)試,使用的電路板一部分是用老師提供的PCB板,另一部分是自己用實(shí)驗(yàn)板焊接的。為了方便調(diào)試,工作電源采用了微機(jī)USB接口的5伏電源,調(diào)試時出現(xiàn)了以下幾個主要的問題:首先,在單獨(dú)調(diào)試測溫程序段時溫度顯示總是85攝氏度,后來發(fā)現(xiàn)原因是測溫需要一定的時間,在增加了一定的延時后,問題得到解決。其次,在增加上第三個按鍵使系統(tǒng)測溫并顯示時,溫度顯示會出現(xiàn)一些異常數(shù)據(jù),后經(jīng)過在總體程序中多次處檢測調(diào)試,才發(fā)現(xiàn)是定時中斷的影響,因此在調(diào)用測溫子程序時關(guān)閉定時中斷后,測溫系統(tǒng)運(yùn)行正常。再者,對于本設(shè)計,在加上測溫模塊時,原想能使整個系統(tǒng)很好的融合,但在轉(zhuǎn)速和溫度同時顯示時,整個系統(tǒng)在工作時會出現(xiàn)異常掉電,多方查證還是沒得到很好的解決,由于時間問題,把測溫作為單獨(dú)模塊,希望以后有機(jī)會改進(jìn)。設(shè)計中畫出了電路板圖,由于各方面的原因,沒能生產(chǎn)出電路板,因此結(jié)合老師提供的器材,自己動手搭接了完整的電路板,雖然美觀不足,但也實(shí)現(xiàn)的預(yù)期的功能。對于在分析和設(shè)計過程中用到的匯編語言,設(shè)計模式,單片機(jī)知識等,這任何一個方面可以說都是一個龐大的體系,在短短幾個月的時間里,只能粗淺的了解大概,期望能在以后的工作中加以充實(shí)??傮w來說通過本次設(shè)計,自己的動手能力和編程能力有了質(zhì)的提高,為以后的進(jìn)步奠定了基礎(chǔ)。但是還是發(fā)現(xiàn)了很多不足之處,如:知識與實(shí)驗(yàn)相結(jié)合的能力欠缺等,還仍需改進(jìn)。參考文獻(xiàn)[1]  :中國科學(xué)技術(shù)出版社,2002:50-63[2]  李光飛,樓然苗,:北京航空航天大學(xué)出版,2004:105125[3]  :機(jī)械工業(yè)出版社,2002:88103[4]  吳金戌,沈慶陽,:清華大學(xué)出版社,2002:83118[5]  何希才,:電子工業(yè)出版社,:778[6]  韓志軍,沈晉源,:機(jī)械工業(yè)出版社 2005:130142[7]  梅麗鳳,:清華大學(xué)出版社,2004:296323[8]  謝筑森,張輝,:中國科技大學(xué)出版社,1997:59[9]  :北京航空航天大學(xué)出版社,2003:2025[10]  :西安電子科技大學(xué)出版社,2002:667[11]  刑增平.Protel 99 SE 設(shè)計專家指導(dǎo).北京::37-90[12]  :電子工業(yè)出版社,2001:4549[13]  ::32-43[14]  :[畢業(yè)論文].萬方數(shù)據(jù):河南科技大學(xué),2004:12[15]  :高等教育出版社,2004[16]  童詩白,:高等教育出版社,2003[17]  :電子工業(yè)出版社,2005[18]  :機(jī)械工業(yè)出版,1998[19]  :人民郵電出版社,2002.[20]  :清華大學(xué)出版社,2004[21]  :中國鐵道出版社,1994致 謝首先我要感謝的是我們的導(dǎo)師王新勇老師,本設(shè)計是在他的悉心指導(dǎo)下完成的。從開始做畢業(yè)設(shè)計以來,我們一直在王老師的帶領(lǐng)下展開學(xué)習(xí),整個設(shè)計過程幾乎都是在電工電子實(shí)驗(yàn)室內(nèi)完成,完備的實(shí)驗(yàn)設(shè)施為我們提供了很好的實(shí)驗(yàn)條件,使我們可以把理論和實(shí)踐隨時結(jié)合,這樣的條件是他人沒有的。設(shè)計中王老師鼓勵我們不斷的嘗試,在嘗試中發(fā)現(xiàn)問題,在多次問題討論中,我深深感受到了王老師深厚的理論功底和豐富的實(shí)踐經(jīng)驗(yàn)。同時,王老師嚴(yán)謹(jǐn)?shù)闹螌W(xué)態(tài)度、孜孜不倦的求學(xué)精神、敏銳的思維以及深刻而獨(dú)到的見解常常讓我佩服不已,并將激勵我在今后的學(xué)習(xí)和工作中做出更好的成績。還要一提的是,為了我們能更好的學(xué)習(xí),王老師放棄了周末的休息時間,陪著我們待在實(shí)驗(yàn)室里,以便我們隨時請教。能在王老師的帶領(lǐng)下學(xué)習(xí),我感到榮幸和自豪!此外,我還要感謝曾和我一起共同在實(shí)驗(yàn)室里學(xué)習(xí)過的各位同學(xué),他們是王偉同學(xué)、李永飛同學(xué)、關(guān)英同學(xué),在本設(shè)計中我得到了他們無私的幫助和鼓勵,沒有他們的幫助我是不可能這么順利的完成整個設(shè)計的。 附 錄附錄Ⅰ 電路原理圖 附錄Ⅱ 印刷電路板圖附錄Ⅲ 樣機(jī) 外文資料原文DS1722 Digital Thermometer With scientific and technological progress and development of the types of temperature sensors increasingly wide range of application of the increasingly widespread, and the beginning analog toward digital, singlebus, dualbus and bus3 direction. And the number of temperature sensors because they apply to all microprocessor interface consisting of automatic temperature control system simulation can be overe sensor and microprocessor interface need signal conditioning circuit and A / D converters advantages of the drawbacks, has been widely used in industrial control, electronic transducers, medical equipment and other temperature control system. Among them, which are more representative of a digital temperature sensor DS18B20, MAX6575, the DS1722, MAX6636 other. This paper introduces the DS1722 digital temperature sensor characteristics, the use of the method and its timing. Internal structure and other relevant content. FEATURES:Temperature measurements require no external ponents。Measures temperatures from 55176。C to +120176。C. Fahrenheit equivalent is 67176。F to +248176。F。Thermometer accuracy is 177。176。C。Thermometer resolution is configurable from 8 to 12 bits (176。C to 176。C resolution)。Data is read from/written to via a Motorola Serial Peripheral Interface (SPI) or standard 3wire serial interface。Wide analog power supply range ( )。Separate digital supply allows for logic。Available in an 8pin SOIC (150 mil), 8pin USOP, and flip chip package。PIN ASSIGNMENTFIGURE 1 PIN ASSIGNMENTPIN DESCRIPTION:SERMODE Serial Interface Mode.CE Chip Enable.SCLK Serial Clock.GND – Ground.VDDA Analog Supply Voltage.SDO Serial Data Out.SDI Serial Data In.VDDD Digital Supply Voltage.DESCRIPTION:The DS1722 Digital Thermometer and Thermostat with SPI/3Wire Interface provides temperature readings which indicate the temperature of the device. No additional ponents are required。 the device is truly a temperaturetodigital converter. Temperature readings are municated from the DS1722 over a Motorola SPI interface or a standard 3wire serial interface. The choice of interface standard is selectable by the user. For applications that require greater temperature resolution, the user can adjust the readout resolution from 8 to 12 bits. This is particularly useful in applications where thermal runaway conditions must be detected quickly.For application flexibility, the DS1722 features a wide analog supply rail of . A separate digital supply allows a range of to . The DS1722 is available in an 8pin SOIC (150mil), 8pin USOP, and flip chip package.Applications for the DS1722 include personal puters/servers/workstations, cellular telephones, office equipment, or any thermallysensitive system.OVERVIEW:A block diagram of the DS1722 is shown in Figure 2. The DS1722 consists of four major ponents:1. Precision temperature sensor.2. Analogtodigital converter.3. SPI/3wire interface electronics.4. Data registers.The factorycalibrated temperature sensor requires no external ponents. The DS1722 is in a power conserving shutdown state upon powerup. After powerup, the user may alter the configuration register to place the device in a continuous temperature conversion mode or in a oneshot conversion mode. In the continuous conversion mode, the DS1722 continuously converts the temperature and stores the result in the temperature register. As conversions are performed in the background, reading the temperature register does not affect the conversion in progress. In the oneshot temperature conversion mode, the DS1722 will perform one temperature conversion, store the result in the temperature register, and then eturn to the shutdown state. This conversion mode is ideal for power sensitive applications. More information on the configuration register is contained in the “OPERATIONProgramming” section. The temperature conversion results will have a default resolution of 9 bits. In applications where small incremental temperature changes are critical, the user can change t
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