上下限溫度報警器的設(shè)計

電子機電論文編號:JD992   論文字數(shù):24867,頁數(shù):44

目錄
摘要 1
abstract 2
引言 4
1  電路原理及構(gòu)成 5
1.1 方案一： 5
1.2 方案二： 5
1.3 兩種方案的比較: 12
2  方案2中各部分單元器件簡介 12
2.1 溫度采集部分:DS18B20智能溫度控制器 12
2.2 溫度存儲部分:I2C總線的應(yīng)用 17
2.3  控制部分:AT89C51單片機 20
2.4 顯示部分:七段LED顯示器 24
2.5 鍵盤部分 27
3  電路的調(diào)試 28
3.1 硬件電路的檢測 29
3.2 程序編寫以及調(diào)試 29
4  結(jié)論 34
謝  辭 36
參考文獻 37
附  錄 38
附錄1  電路原理圖 38
附錄2  PCB圖 39
附錄3  程序清單 40

摘要
 
 在科技越來越發(fā)達的今天，可以通過各種各樣的有效途徑達到對不同的場合需要進行溫度測量和溫度控制。本文將介紹一種由單片機﹑傳感器等組成的溫度檢測報警器。控制芯片采用AT89S51系列單片機，傳感器采用一線數(shù)字溫度傳感器DS18B20，鍵盤采用掃描式非編碼鍵盤，顯示部分采用兩位LED動態(tài)顯示方式，用蜂鳴器作為發(fā)聲報警器件。此電路設(shè)計的功能為測量兩節(jié)點溫度值，并可對任一節(jié)點的最高和最低溫限進行設(shè)定；還可對兩點之間的溫度進行比較，得到溫差；當(dāng)某節(jié)點溫度超過最高或最低溫限時以及兩點之間溫差超過設(shè)定值時蜂鳴器發(fā)聲報警，并把各節(jié)點溫度值存入24C02。DS18B20的測溫范圍為-55°C~+125°C，測量精度為0.5°C。本文的測溫范圍設(shè)定在0°C~99°C，采用的顯示精度為1°C。
關(guān)鍵詞：單片機；DS18B20;AT24C02;溫度；溫差。
   
 
abstract
 
Nowadays, science and technology is more and more developed, we can reach and need to carry on temperature survey and temperature control to different occasions through various effective ways. This paper will introduce a kind of temperature measure annunciator that made up of single-chip microcomputer, sensor, etc. . Control-chip adopts the AT89S51 series single-chip microcomputer, the sensor adopts the one-line digital temperature sensor DS18B20, the keyboard adopts the scanning type uncoded keyboard, displayer adopts two dynamic display mode LED, uses buzzer as the sound-warning device. Function that circuit design in this paper is to measure two nodal temperature value, and set the most high and low-temperature limit for any chosen sensor ; Can also compare temperature between two nodes, get the difference in temperature; When some nodal temperature exceeds most high or low-temperature and two nodes’ difference in temperature prescribed in advance, buzzer sounds as warning, and reserves each sensor’s temperature. The temperature measure range of DS18B20 is -55 °c～+125°c, and the precision is 0.5°c. In this paper, we use the range of 0°c～99°c  C°
 , and the display precision of 1°c.

Keywords: single-chip microcomputort; DS18B20; AT24C02; temperature; difference in temperature.