【正文】 想要的，不想要的，界限明確，好像沒(méi)有什么可以撼動(dòng)自己。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。s governing body, has also ordered an immediate investigation into the referee39。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept it. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。對(duì)于本設(shè)計(jì)能夠順利的完成，首先我要向我的畢業(yè)設(shè)計(jì)指導(dǎo)老師陳惠英老師致以誠(chéng)摯的謝意。從整體來(lái)看，本智能水族箱系統(tǒng) 具有操作簡(jiǎn)單、價(jià)格便宜、體積小、便于安裝等優(yōu)點(diǎn)，從水溫和水位的檢測(cè)和水泵、加熱棒等的驅(qū)動(dòng)上也基本達(dá)到了課題的設(shè)計(jì)要求。在調(diào)試電路時(shí)出現(xiàn)故障，應(yīng)查找故障原因并排除故障。焊接時(shí)參考設(shè)計(jì)原理圖，清楚認(rèn)知每個(gè)芯片引腳作用后仔細(xì)連接各個(gè)引腳。 通過(guò)設(shè)定功能并發(fā)送需要現(xiàn)實(shí)的字符代碼，使液晶通過(guò)不同引腳顯示需要的數(shù)據(jù)和字符。軟件整體設(shè)計(jì)工作流程如圖 41 所示。 軟件結(jié)構(gòu)設(shè)計(jì)和程序設(shè)計(jì)方法確定后，根據(jù)系統(tǒng)功能定 義，可先畫(huà)出程序粗框圖，再對(duì)粗框圖進(jìn)行擴(kuò)充和具體化，既對(duì)存儲(chǔ)器，寄存器，標(biāo)志位等工作單元作具體的分配和說(shuō)明。明確主次序和中斷服務(wù)程序完成的操作及指定各中斷的優(yōu)先級(jí)。引腳 5 是： R/W 為讀寫(xiě)信號(hào)線，高電平時(shí)進(jìn)行讀操作，低電平時(shí)進(jìn)行寫(xiě)操作。其顯示原理為具體顯示電路如圖 37 所示。其單片機(jī)最小系統(tǒng)電路如圖 37所示。 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 11 EA/VPP：訪問(wèn)外部程序存儲(chǔ)器控制信號(hào)。在訪問(wèn)外部程序存儲(chǔ)器或用16位地址讀取外部數(shù)據(jù)存儲(chǔ)器時(shí)， P2 口就送出 8位地址。在程序校驗(yàn)時(shí)，需要外部上拉電阻。 本設(shè)計(jì)采用 STC89C52 單片機(jī)作為控制核心，它被廣泛地運(yùn)用在電子產(chǎn)品的設(shè)計(jì)中，它是一種低功耗、高性能的 8 位微控制器，其引腳圖如圖 36 所示，其各引腳功能如下介紹： 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 10 圖 36 STC89C52 單片機(jī)引腳圖 VCC:電源。 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 8 電流大，可直接推動(dòng)多種自動(dòng)控制的負(fù)載。 圖 32 水溫檢測(cè)電路圖 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 7 溫度控制電路 溫度控制電路如下圖 33 所示，采用繼電器來(lái)驅(qū)動(dòng) PTC 加 熱棒，由于繼電器能用較小的電流去控制較大電流的一種“自動(dòng)開(kāi)關(guān)”。 （ 5）溫范圍－ 55℃～＋ 125℃，在 10～ +85℃時(shí)精度為177。現(xiàn)場(chǎng)溫度直接以“一線總線”的數(shù)字方式傳輸，用符號(hào)擴(kuò)展的 16 位數(shù)字方式串行輸出，大大提高了系統(tǒng)的抗干擾性。其中水溫傳感器選用 DS18B20 芯片。但是超聲波水位計(jì)價(jià)格昂貴且此處水位測(cè)量精度要求不是特別高。 圖 21 系統(tǒng)設(shè)計(jì)整體框圖 軟件設(shè)計(jì)部分則通過(guò)用 C語(yǔ)言編寫(xiě)程序來(lái)控制整個(gè)系統(tǒng)的測(cè)量、控制和顯示，從而實(shí)現(xiàn)基于單片機(jī)的智能水族箱系統(tǒng)的控制。這些不容忽視的團(tuán)體，正在成為水族產(chǎn)業(yè)消費(fèi)的主力軍。智能水族箱系統(tǒng)產(chǎn)品在國(guó)外是一個(gè)發(fā)達(dá)的產(chǎn)業(yè)，它在節(jié)能方面有廣泛的應(yīng)用。s living standards. Aquariums and aquarium fish has bee a family favorite, a fashion, more and more families at large would in everyday life people do not have more time to care for pet fish, water and climatecontrolled, while the Aquarium is also on the market of heating and water installations but is independent and is expensive. Designed circuit is simple, small, intelligent very realistic aquarium system. This article has designed an aquarium based on singlechip microputer intelligent systems, temperature control modules, water level modules, SCM module and liquid crystal display module. STC89C52 SCM as the core control of the system, the measured temperature and water level fed into the STC89C52 MCU for parison, by parison to determine whether drive heating and water pumps, and in 1602 LCD display temperature on water level. Keywords： Smart, MCU,Control 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 III 目 錄 第一章 緒論 ................................................................................................................................................. 1 .......................................................................................................................................... 1 .................................................................................. 1 .............................................................................................................................. 2 第二章 基于單片機(jī)的電感測(cè)試儀的總體方案設(shè)計(jì) ................................................................................. 3 步設(shè)定 .......................................................................................................... 3 ...................................................................................................... 3 .............................................................................................. 3 .................................................................................................. 3 智能水族箱的總設(shè)計(jì)方案 ............................................................................................................. 4 第三章 系統(tǒng)硬件設(shè)計(jì) ................................................................................................................................... 5 .................................................................................................................................. 5 .......................................................................................................................... 5 DS18B20芯片 ...................................................................................................................... 5 ...................................................................................................................... 6 溫度控制電路 ..................................................................................................................... 7 ......................................................