【正文】 emperature or high temperature will cause the water to lose its proper role, resulting in a huge waste of water resources, bring many negative factors to the life and production. This paper based on the single chip puter technology and sensor technology, develops a set of solution of hardware and software bination to plete temperature controller design. In terms of hardware, this paper uses AT89S52 microcontroller as the core control device, bines with crystal circuit, reset circuit, alarm circuit, display circuit and peripheral temperature measurement circuit temperature controller system. In terms of software, the software flow chart of the system is given. This paper uses C language as a programming language design and the system can display the temperature and other information. The water temperature controller system can be widely used in electrical appliances, vehicles, materials, bioengineering and other fields. The system is simple, low power consumption, high accuracy, and has good applicability and promotional value. Key words: DS18B20； AT89S52； Water temperature control； C language xx 大學(xué)本科畢業(yè)設(shè)計(jì)（論文） Ⅲ 目 錄 摘 要 ............................................................................................................................. IV ABSTRACT ..................................................................................................................... II 1 緒論 .............................................................................................................................1 水溫控制器的介紹 ...........................................................................................1 本設(shè)計(jì)的要求 ...................................................................................................1 2 主要器件 介紹 .............................................................................................................3 單片機(jī)的選擇 ...................................................................................................3 AT89C52 單片機(jī)性能簡介 .....................................................................3 AT89C52 單片機(jī)引腳功能說明 .............................................................3 傳感器的選擇 ...................................................................................................5 DS18B20 的簡介 ....................................................................................5 DS18B20 的引腳功能說明 ....................................................................6 驅(qū)動(dòng)芯片的選擇 ...............................................................................................7 74LS245 的簡介 ......................................................................................7 74LS245 的引腳說明 ..............................................................................7 顯示器的選擇 ...................................................................................................8 數(shù)碼管的簡介 .........................................................................................8 數(shù)碼管驅(qū)動(dòng)方式 .....................................................................................8 數(shù)碼管的引腳功能說明 .........................................................................9 3 系統(tǒng)硬件構(gòu)成 ........................................................................................................... 11 設(shè)計(jì)原理 ......................................................................................................... 11 外圍電路 ......................................................................................................... 11 電源電路 ............................................................................................... 11 晶振電路 ...............................................................................................12 復(fù)位電路 ...............................................................................................13 報(bào)警電路 ...............................................................................................13 加熱控制電路 .......................................................................................14 測(cè)溫電路 ...............................................................................................14 顯示電路 ...............................................................................................15 4 系統(tǒng)軟件設(shè)計(jì) ...........................................................................................................17 5 軟件調(diào)試及仿真 .......................................................................................................19 xx 大學(xué)本科畢業(yè)設(shè)計(jì)（論文） Ⅳ 軟件編譯 .........................................................................................................19 工程的創(chuàng)建 ...........................................................................................19 AT89C52 單片機(jī)的選擇 .......................................................................19 程序的編譯 ......................................................