【正文】 nt system of digital temperature sensor DS1820 which adopts onewirebus technology，humidity sensor circuit of sensor HS1101，in order to prevent the distortion of humidity data gathered by mock sensor， the 1inear inter polation algorithm is ， it designs hardware circuit of eommunication interface and software system， including the introduction of adopted AT89551SCM，storage expansion of AT24C04 of l’CBus，display out put of 4 digital tubes，audio alarm of overrun data，auxiliary data storage of mock last，it elaborates the working principle， designing thoughts and realizing methods of puter software first，throughRS 232C protocol SCM and puter are connected，and data is received and sent by serial inferface with the help of active X programmed by serial munication in widows enviorment. Computer can display，store ，inquire and print the data and setting as a monitor.This system integrates modern signal gathering technology，signal transmitting technology，information proeessingtechnology，bines many parameters in greenhouse environment monitoring and control theory of SCM and by many bus technologies，Proposes one kind of praetieal feasible greenhouse environmental monitoring can automatically record，ste and handle data，pletely ，realtime，and automaticly， and in put the relative information into the puter in an effeetive way according to , it can control the monitoring system meets the equirement of monitoring on crop growth state pletely， realtime， can monitor and control the greenhouse environment timely and realize automation and intelligentize of temperature and humidity testing in greenhouse.Keywords AT89S51。 DS1820。 ISD2560目 錄摘 要 .....................................................................................................................................................................iiAbstract.................................................................................................................................................................iii第 1 章 緒 論 ...................................................................................................................................................1 課題的提出和意義 .....................................................................................................................................1 國(guó)內(nèi)外研究現(xiàn)狀 .........................................................................................................................................1 國(guó)外溫室環(huán)境控制 ................................................................................................................................1 我國(guó)溫室控制技術(shù) ................................................................................................................................1 溫室環(huán)境控制技術(shù)三個(gè)發(fā)展階段 ........................................................................................................2 溫室控制存在的問題 ............................................................................................................................2 主要研究?jī)?nèi)容 .............................................................................................................................................3第 2 章 系統(tǒng)總體設(shè)計(jì) .....................................................................................................................................4 系統(tǒng)功能設(shè)計(jì) .............................................................................................................................................4 系統(tǒng)設(shè)計(jì)原則 .............................................................................................................................................4 系統(tǒng)組成與工作原理 .................................................................................................................................5第 3 章 傳感器設(shè)計(jì) .........................................................................................................................................6 傳感器的基本特性 .....................................................................................................................................6 傳感器的靜態(tài)特性 ..............................................................................................................................6 傳感器的動(dòng)態(tài)特性 ..............................................................................................................................7 DS1820 溫度傳感器 ...................................................................................................................................7 DS1820 溫度傳感器概述 ....................................................................................................................7 DS1820 的讀寫時(shí)序 ............................................................................................................................8 DS1820 的測(cè)溫原理 ............................................................................................................................9 溫度檢測(cè)電路 ....................................................................................................................................10 提高 DS1820 測(cè)溫精度的方法 .........................................................................................................11 軟件設(shè)計(jì) ............................................................................................................................................12 HS1101 濕度傳感器 .................................................................................................................................13 HS1101 濕度傳感器特點(diǎn) ..................................................................................................................13 濕度測(cè)量電路 ....................................................................................................................................14第 4 章 單片機(jī)設(shè)計(jì) .......................................................................................................................................16 AT89S51 單片機(jī) .....................................