【正文】 相關(guān)材料的印刷本和電子版本；同意學(xué)校保留畢業(yè)設(shè)計（論文）的復(fù)印件和電子版本，允許被查閱和借閱；學(xué)?？梢圆捎糜坝?、縮印或其他復(fù)制手段保存畢業(yè)設(shè)計（論文），可以公布其中的全部或部分內(nèi)容。 此系統(tǒng)由分流電阻、分壓電阻、基準(zhǔn)電阻、單片機(jī)最小系統(tǒng)、顯示部分、報警部分、 A/D 轉(zhuǎn)換和控制等部分組成。溫度的測量則采用溫度傳感器 DS18B20 來完成。 關(guān) 鍵詞 ： 多功能數(shù)字測量儀 AD 轉(zhuǎn)換與控制 AT89S52 長春理工大學(xué)本科畢業(yè)設(shè)計 II Abstract This design used to design a digital multipurpose meter, with chip AT89S52 of onechip puter, it can measure voltage,current,resistance,the temperature and so on, and it is equipped with timing function,with buttons and display system is made up of shunted resistance, resistance of partial pressure, basic resistance, minimum system of 52 onechip puters, shown that some , warning part , AD change and order to make the system more stable , and to make the whole precision of the system will be ensured, this circuit has used AD0809 data to change the chip, the onechip puter system is designed to adopt AT89S52 onechip puter as the master chip, together with the RC poweron reset circuit and oscillator circuit, shown with LCD1602 screens. Each execution cycle timeconsuming process reduced to a minimum, thus ensuring that the system in real time， the measurement of the temperature is adopted DS18B20 to design will be through the two aspects of hardware and software implementation. Key words: Digital multipurpose meter； AD changes and controls； AT89S52 長春理工大學(xué)本科畢業(yè)設(shè)計 III 目 錄 摘 要 ............................................................................................................................... I Abstract .........................................................................................................................II 第 1 章 緒論 .................................................................................................................. 1 多功能數(shù)字測量儀的設(shè)計目的和意義 ........................................................... 1 國內(nèi)外研究現(xiàn)狀 ............................................................................................... 1 多功能數(shù)字測量儀的特點 ............................................................................... 2 多功能數(shù)字儀的發(fā)展趨勢 ............................................................................... 3 本設(shè)計的任務(wù) ................................................................................................... 4 第 2 章 總體設(shè)計方案及選用芯片介紹 ..................................................................... 5 總體設(shè)計方案 ................................................................................................... 5 芯片的選擇及介紹 ........................................................................................... 6 AT89S52 芯片的介紹 ............................................................................. 6 ADC0809 芯片的介紹 ........................................................................... 8 DS18B20 芯片的介紹 ............................................................................ 9 LCD1602 液晶顯示器介紹 .................................................................. 11 第 3 章 多功能數(shù)字測量儀硬件設(shè)計 ....................................................................... 12 電路工作過程描述 ......................................................................................... 12 系統(tǒng)各部分實現(xiàn)方法 ..................................................................................... 12 電源電路 ............................................................................................... 12 輸入端子 ............................................................................................... 13 直流電流測量電路 ............................................................................... 13 直流電壓測量電路 ............................................................................... 15 電阻測量電路 ....................................................................................... 18 溫度測量電路 ....................................................................................... 19 交直流轉(zhuǎn)換電路 ................................................................................... 20 模數(shù)轉(zhuǎn)換電路 ....................................................................................... 20 報警電路 ............................................................................................... 21 顯示電路 ............................................................................................. 22 單片機(jī)最小系統(tǒng) ................................................................................. 23 選擇開關(guān)和按鍵 ................................................................................. 23 第 4 章 多功能數(shù)字測量儀軟件設(shè)計 ....................................................................... 25 系統(tǒng)設(shè)計目標(biāo) ................................................................................................. 25 C 語言 概述 ..................................................................................................... 25 長春理工大學(xué)本科畢業(yè)設(shè)計 IV 軟件設(shè)計思路 ................................................................................................. 25 系統(tǒng)模塊設(shè)計 ................................................................................................. 28 初始化模塊 ........................................................................................... 28 A/D 數(shù)據(jù)采集和轉(zhuǎn)換模塊 ................................................................... 29 數(shù)據(jù)處理模塊 ....................................................................................... 30 按鍵模塊 ............................................................................................... 31 顯示模塊 ............................................................................................... 32 計時模塊 ............................................................................................... 33 量程選擇框圖 ................................................................................................. 34 總結(jié) ....................................................................................