【正文】 ..................................................2第 2 章 方案的比較和論證........................................................................3 溫度傳感器的選擇 ........................................................................................................3 采用熱電阻溫度傳感器 .........................................................................................3 采用 AD590 溫度傳感器 .........................................................................................3 濕度傳感器的選擇 ........................................................................................................4 采用 HOS201 濕敏傳感器 .....................................................................................4 采用 HS1100/HS1101 濕度傳感器 .........................................................................4 信號(hào)采集通道的選擇 ....................................................................................................4 采用多路并行模擬量輸入通道 .............................................................................5 采用多路分時(shí)的模擬量輸入通道 .........................................................................5第 3 章 系統(tǒng)總體設(shè)計(jì)................................................................................6 信號(hào)采集 ........................................................................................................................6 溫度傳感器 .............................................................................................................6 濕度傳感器 ...........................................................................................................10 多路開(kāi)關(guān) ...............................................................................................................12 信號(hào)分析與處理 ..........................................................................................................14 A/D 轉(zhuǎn)換 ................................................................................................................14 MC14433 與 AT89S51 單片機(jī)的接口設(shè)計(jì) ............................................................17 單片機(jī) AT89S51...........................................................................................................18 主要特性 ...............................................................................................................18 內(nèi)部結(jié)構(gòu) ...............................................................................................................18 外部特性（引腳功能） .......................................................................................21 工作方式 ...............................................................................................................22 數(shù)據(jù)存儲(chǔ)器的掉電保護(hù) .......................................................................................23 顯示與報(bào)警的設(shè)計(jì).......................................................................................................23 顯示電路 ...............................................................................................................23 報(bào)警電路 ...............................................................................................................24第 4 章 軟件設(shè)計(jì)......................................................................................25參考文獻(xiàn)....................................................................................................34致謝............................................................................................................36誠(chéng)信聲明第 1章 緒論 選題背景近幾年來(lái)隨著國(guó)內(nèi)淀粉由供大于求向供不應(yīng)求方向的轉(zhuǎn)變，淀粉的流通領(lǐng)域亦發(fā)生了重大的變化，由過(guò)去分散的小規(guī)模經(jīng)營(yíng)逐步向集中的大規(guī)模經(jīng)營(yíng)過(guò)渡，使高水分淀粉貯存矛盾突出。本設(shè)計(jì)包括硬件設(shè)計(jì)和軟件設(shè)計(jì),并給出了硬件電路設(shè)計(jì)原理框圖和軟件設(shè)計(jì)流程圖。本系統(tǒng)是以 AT89S51單片機(jī)為控制單元、溫度傳感器 AD590、濕度傳感器 SHT1100 為主要檢測(cè)器件，實(shí)現(xiàn)溫度、濕度的測(cè)量、顯示、報(bào)警、保存。 畢業(yè)設(shè)計(jì)（論文）題 目： 淀粉烘干設(shè)備的電控系統(tǒng)設(shè)計(jì) 摘 要濕度及濕度的測(cè)量和控制對(duì)人類(lèi)日常生活、工業(yè)生產(chǎn)、氣象預(yù)報(bào)、物資倉(cāng)儲(chǔ)等都起著極其重要的作用。本設(shè)計(jì)使用單片機(jī)匯編語(yǔ)言進(jìn)行設(shè)計(jì)開(kāi)發(fā)，采用 Protel 99SE 實(shí)現(xiàn)電路的設(shè)計(jì)要求：溫度測(cè)量范圍為 30℃～+150℃，精度為177。關(guān)鍵詞：?jiǎn)纹瑱C(jī)，溫濕度，A/ D 轉(zhuǎn)換ABSTRACTThe single ship microputer is required extensively in measurement and control systems and the temperature and humidity need to be surveyed ,controlled and maintained by a system frequently. Humidity and moisture measurement and control of human daily life, industrial production, weather forecasting, materials storage and so plays a vital role. On many occasions, the objective of timely and accurate access to the temperature and humidity information is very important, in recent years, monitoring and control temperature and humidity fields have developed rapidly, and with the development of digital technology, measurement and control temperature and humidity of the chip also boarded the corresponding stage of history, In industry, agriculture and other fields in widespread use. For this area of development, this paper, based on the temperature, humidity detection system. AT89S51 SCM is the system for the control unit, temperature and humidity sensor SHT1100 as the main detection devices, temperature, humidity measurements, display, alarm and preserve. The design of the C language design, development, use Protel 99SE to achieve the circuit design requirements: temperature measurement range of 30℃~ +150 ℃, accuracy of 177。因此北方淀粉集中產(chǎn)區(qū)大量使用淀粉烘干設(shè)備，將淀粉烘干后貯存和銷(xiāo)售，由于不恰當(dāng)?shù)氖褂煤娓稍O(shè)備，造成大量的高溫烘干淀粉上市，給淀粉深加工業(yè)帶來(lái)不良影響，造成重大經(jīng)濟(jì)損失，應(yīng)該引起淀粉生產(chǎn)行業(yè)和加工行業(yè)高度重視。因此，淀粉烘干是淀粉生產(chǎn)工藝中非常重要的工序之一。時(shí)間過(guò)長(zhǎng)，細(xì)胞壁的纖維強(qiáng)度下降，有一部分細(xì)小纖維留在淀粉中很難分離。此外高溫烘干的淀粉加工困難降低了工業(yè)價(jià)值 [27]。計(jì)算機(jī)的控制應(yīng)用一般分為兩個(gè)方面:一是計(jì)算機(jī)在控制系統(tǒng)中的離線應(yīng)用，另一是計(jì)算機(jī)在控制系統(tǒng)中的在線應(yīng)用。本文的研究是通過(guò)控制烘干過(guò)程中的烘干溫度、烘干時(shí)間等因素，來(lái)增加淀粉得率，使成品淀粉中蛋白質(zhì)含量降低，得到最佳的烘干條件。淀粉除直接用十食品、造紙、紡織、醫(yī)藥等領(lǐng)域外，絕大多數(shù)用十深加工。 基本功能檢測(cè)溫度、濕度顯示溫度、濕度控制溫度、濕度過(guò)限報(bào)警 主要技術(shù)參數(shù)