摘要
　　　隨著時代的進步和發(fā)展，單片機技術(shù)已經(jīng)普及到我們生活、工作、科研、各個領(lǐng)域，已經(jīng)成為一種比較成熟的技術(shù), 本文主要介紹了一個基于89C52單片機的測溫系統(tǒng)，詳細(xì)描述了利用數(shù)字溫度傳感器DS18B20開發(fā)測溫系統(tǒng)的過程，重點對傳感器在單片機下的硬件連接，軟件編程以及各模塊系統(tǒng)流程進行了詳盡分析，對各部分的電路也一一進行了介紹,該系統(tǒng)可以方便的實現(xiàn)實現(xiàn)溫度采集和顯示，并可根據(jù)需要任意設(shè)定上下限報警溫度，它使用起來相當(dāng)方便，具有精度高、量程寬、靈敏度高、體積小、功耗低等優(yōu)點，適合于我們?nèi)粘Ｉ詈凸?、農(nóng)業(yè)生產(chǎn)中的溫度測量，也可以當(dāng)作溫度處理模塊嵌入其它系統(tǒng)中，作為其他主系統(tǒng)的輔助擴展。DS18B20與STC89C52結(jié)合實現(xiàn)最簡溫度檢測系統(tǒng)，該系統(tǒng)結(jié)構(gòu)簡單，抗干擾能力強，適合于惡劣環(huán)境下進行現(xiàn)場溫度測量，有廣泛的應(yīng)用前景。
關(guān)鍵詞：單片機；溫度檢測；STC89C52；DS18B20；
　　　
　　
High precision temperature controller

Abstract
With the progress of The Times and development, technology has spreadto our life, work, scientific research, each domain, has become a more maturetechnology, this paper introduces a 89C52 MCU based on temperature measuring system, describes the detailed using digital temperature sensor DS18B20 temperature measuring system development, focus on the process of sensors in the SCM, software and hardware connect each module system programming, and makes a detailed analysis process of each part of the circuit is introduced, and this one system can realize temperature can easily, and collecting and according to need any set upper temperature, it USES up alarm is very convenient, and has high precision, wide range, high sensitivity, small volume, low power consumption, suitable for our daily life and the work of agricultural production, temperature measurement, also can be used as temperature processing module embedded system, as other other main auxiliary system. Combined with the DS18B20 STC89C52 temperature detection system, the reduction system structure is simple, strong anti-jamming capability, which is suitable for the bad environment temperature measurement, site wide
Keywords: SCM, Temperature detection. STC89C52, DS18B20

　　
目錄
一．緒論 2
（一）課題來源及意義 2
（二）現(xiàn)代溫度測量技術(shù) 2
（三）智能儀器的簡介 4
（四）課題主要完成任務(wù)……….………………………………..5
二．高精度測溫控制總體方案設(shè)計 7
（一）設(shè)計方案選擇 7
（二）單片機的選擇 7
三．高精度測溫控制系統(tǒng)的硬件設(shè)計 17
（一）輸入電路的設(shè)計 17
(二)　傳感器輸入選擇設(shè)計 17
四.高精度測溫控制系統(tǒng)軟件設(shè)計 25
（一）主程序的逐步設(shè)計 25
1．初始化和工作方式選擇程序的設(shè)計 25
2. 溫度值調(diào)整程序的設(shè)計………………………………28
3. 二進制溫度值轉(zhuǎn)化BCD碼顯示值的程序設(shè)計…….29
4. 超溫報警程序的設(shè)計………………………………29
(二) RS-232通信程序的設(shè)計………………………….29
1. 串行通信程序的設(shè)計………………………………29
2. 波特率的設(shè)置………………………………………31
(三) 各種被調(diào)用子程序的設(shè)計………………………… 33
結(jié)束語與展望………………………………………………………35
致謝…………………………………………………………………35
參考文獻……………………………………………………………37
附錄…………………………………………………………………39