數(shù)字溫度計的設(shè)計

相關(guān)論文：數(shù)字溫度計的設(shè)計 數(shù)字溫度計設(shè)計 單片機(jī)的數(shù)字溫度計設(shè)計 數(shù)字溫度計設(shè)計 數(shù)字溫度計 數(shù)字溫度計 全套

摘  要
 隨著現(xiàn)代信息技術(shù)的飛速發(fā)展和傳統(tǒng)工業(yè)改造的逐步實(shí)現(xiàn)。能夠獨(dú)立工作的溫度檢測和顯示系統(tǒng)應(yīng)用于諸多領(lǐng)域。傳統(tǒng)的溫度檢測以熱敏電阻.為溫度敏感元件。熱敏電阻的成本低，但需后續(xù)信號處理電路，而且可靠性相對較差，測溫準(zhǔn)確度低，檢測系統(tǒng)也有一定的誤差。
 與傳統(tǒng)的溫度計相比，這里設(shè)計的數(shù)字溫度計具有讀數(shù)方便，測溫范圍廣，測溫精確，數(shù)字顯示，適用范圍寬等特點(diǎn)。選用AT89C51型單片機(jī)作為主控制器件，DS18B20作為測溫傳感器通過4位共陽極LED數(shù)碼管串口傳送數(shù)據(jù)，實(shí)現(xiàn)溫度顯示。通過DS18B20直接讀取被測溫度值，進(jìn)行數(shù)據(jù)轉(zhuǎn)換，該器件的物理化學(xué)性能穩(wěn)定，線性度較好，在O℃~100℃最大線性偏差小于0．1℃。該器件可直接向單片機(jī)傳輸數(shù)字信號，便于單片機(jī)處理及控制。另外，該溫度計還能直接采用測溫器件測量溫度，從而簡化數(shù)據(jù)傳輸與處理過程。

關(guān)鍵詞：溫度傳感器，DS18B20，AT89C51，顯示電路, 數(shù)字溫度計

  
 Abstract
 Along with present information technology swift development and traditional industry transformation gradual realization. Can the independent working temperature examination and the display system applies in many domains. Traditional temperature examination take thermistor as temperature sensitive unit. Thermistor's cost is low, but needs the following signal processing electric circuit, moreover the reliability is relatively bad, the temperature measurement accuracy is low, the examination system also has certain error.
  Compares with the traditional thermometer, here designs the digital thermometer has the reading to be convenient, the temperature measurement scope is broad, the temperature measurement is precise, the digit demonstrated that applicable scope wide and so on characteristics. Selects at89C51 monolithic integrated circuit to take the master control component, DSl8820 takes the temperature measurement sensor through 4 altogether anode LED nixietube serial port transmission data, realizes the temperature demonstration. Is measured through the DSl8820 direct read the temperature value, carries on the data conversion, this component's physical chemistry stable property, the linearity is good, is smaller than at O℃~100℃ the biggest linear deviation 0.1℃. This component may to the monolithic integrated circuit transmission digital signal, be advantageous for monolithic integrated circuit processing and the control directly. Moreover, this thermometer can also use the temperature measurement component survey temperature directly, thus reduced data transmission and treating processes.

 Keywords: Monolithic integrated circuit； Temperature sensor；DS18B20, AT89C51；Display circuit；Digital thermometer

 
 目  錄
1 緒論 1
1.1  論文選題背景及研究意義 1
1.2  論文研究的內(nèi)容及方法 1
2  單片機(jī)的介紹及選型 3
2.1 單片機(jī)的發(fā)展和組成 3
2.1.1  單片機(jī)的組成 3
2.1.2  MCS－51單片機(jī)的引腳描述及片外總線結(jié)構(gòu) 4
2.2 單片機(jī)的選型 7
3  傳感器的介紹及應(yīng)用 8
3.1  傳感器 8
3.2  傳感器的特性 9
3.3  信號處理方式 10
3.3.1  特性補(bǔ)償 10
3.3.2  運(yùn)算處理 11
3.4  傳感器的分類 12
3.5  溫度傳感器及其應(yīng)用 12
3.6  DS18B20溫度傳感器 13
4  LED顯示電路 16
4.1  LED介紹 16
4.2  LED顯示 16
4.3 看門狗電路 16
5 系統(tǒng)程序的設(shè)計 18
5.1 系統(tǒng)硬件設(shè)計方案 18
5.2 溫度傳感器與單片機(jī)的連接 18
5.3 復(fù)位信號及外部復(fù)位電路 18
5.4 單片機(jī)與報警電路 19
5.5 電源電路 19
5.6 軟件設(shè)計 19
5.7 數(shù)據(jù)測試 19
5.8 系統(tǒng)軟件算法分析 20
5.8.1 主程序 20
5.8.2 讀出溫度子程序 20
5.8.3 溫度轉(zhuǎn)換命令子程序 20
5.8.4 計算溫度子程序 21
5.8.5 顯示數(shù)據(jù)刷新子程序 21
6 結(jié)束語 23
致 謝 25