【正文】 icroputer as the core of low cost, high precision, miniaturization, liquid crystal display temperature and humidity monitoring by single chip microputer, temperature detection circuit, infrared control circuit, alarm circuit and display the chip AT89S52 control temperature and humidity sensors to detect temperature and humidity value for storage, which is displayed in the LCD display system is easy to install detection, the software function is perfect, reliable operation, high accuracy, etc. This paper discusses the single chip microputer technology successfully developed monitoring system of the basic principle of heater, temperature and humidity sensor signal acquisition scheme by single chip software correction, improve the measurement precision and reliability of the use shows that greatly improves the safety, reliability and accuracy. Keywords: heater, temperature and humidity sensor, singlechip microputer AT89S52 目錄 目錄 摘要 ........................................................................................................................................ I Abstract................................................................................................................................... I 1 緒論 ................................................................................................................................... 1 選題背景 .................................................................................................................. 1 研究的目的和意義 .................................................................................................. 1 暖風(fēng)機(jī)發(fā)展 ............................................................................................................. 2 設(shè)計(jì)過(guò)程及工藝要求 .............................................................................................. 3 設(shè)計(jì)的重點(diǎn)與難點(diǎn) .................................................................................................. 3 2 方案論證與比較 ............................................................................................................... 5 溫度傳感器的選擇 ................................................................................................. 5 電機(jī)選擇 與論證 ..................................................................................................... 5 液晶的選擇 ............................................................................................................. 6 3 系統(tǒng)總體設(shè)計(jì) ................................................................................................................... 7 系統(tǒng)設(shè)計(jì) .................................................................................................................. 7 系統(tǒng)整體結(jié)構(gòu) .......................................................................................................... 7 芯片 AT89S52 介紹 ................................................................................................. 8 引腳功 能介紹 ................................................................................................ 9 時(shí)鐘電路及 RC 復(fù)位電路 ........................................................................ 10 傳感器的介紹 ............................................................................................................. 12 傳感器的定義及作用 .................................................................................. 12 傳感器的特性 .............................................................................................. 13 溫度傳感器 DS18B20 ................................................................................. 13 顯示電路的設(shè)計(jì) .................................................................................................... 15 報(bào)警電路的設(shè)計(jì) .................................................................................................... 17 按鍵電路的設(shè)計(jì) .................................................................................................... 18 紅外線(xiàn)接收的設(shè)計(jì) ................................................................................................ 19 電機(jī)驅(qū)動(dòng)電路設(shè)計(jì) ................................................................................................ 20 繼電器驅(qū)動(dòng)電路 ................................................................................................. 21 繼電器原 理 .............................................................................................. 21 目錄 繼電器驅(qū)動(dòng)電路設(shè)計(jì) .............................................................................. 22 控制電路設(shè)計(jì) ...................................................................................................... 23 按鍵設(shè)計(jì) .................................................................................................... 24 紅外線(xiàn)發(fā)射 電路設(shè)計(jì) ................................................................................ 24 4 系統(tǒng)調(diào)試 ......................................................................................................................... 26 軟硬件的調(diào)試 ........................................................................................................ 26 系統(tǒng)軟件設(shè)計(jì) .........................................................................................