【正文】
完成了環(huán)境監(jiān)測系統(tǒng)的數(shù)據(jù)采集終端的實現(xiàn)。解決了原有技術(shù)方案成本高、難以布線和維護(hù)、對環(huán)境破壞大等缺點。同時 ,該系統(tǒng)有很好的擴(kuò)展性。只要加上相應(yīng)的傳感器就可以廣泛應(yīng)用于遠(yuǎn)程控制和自動控制 ,嵌入各種設(shè)備可望實現(xiàn)更多的功能。如溫室大棚的環(huán)境參數(shù)監(jiān)測、空調(diào)系統(tǒng)的溫度控制、照明的自動控制、家用電器的遠(yuǎn)程控制、火災(zāi)監(jiān)測和煙霧探測等。 目前市場上的近距離無線通信技術(shù)有很多種,如無線局域網(wǎng) WIFI、藍(lán)牙 IRDA、 UWB、RF等。經(jīng)過市場調(diào)研,發(fā)現(xiàn) ZIGBEE無線通信技術(shù)在在無線傳感網(wǎng)絡(luò)中占有廣泛的市場,具有低功耗、數(shù)據(jù)傳輸可靠、網(wǎng)絡(luò)容量大、兼容性強(qiáng)、安全性高、成本低等特點。本設(shè)計采用了 ZIGBEE技術(shù)實現(xiàn)無線網(wǎng)絡(luò)的搭建。經(jīng)過反復(fù) 的測試,本設(shè)計中的無線網(wǎng)絡(luò)節(jié)點通信平臺已經(jīng)可以穩(wěn)定的運行,并且有較好的可靠性和擴(kuò)展性。 本設(shè)計分析了 ZIGBEE的特點和技術(shù)規(guī)范,對組網(wǎng)方式進(jìn)行了深入的研究。提出了一種可以在環(huán)境監(jiān)控中應(yīng)用的無線傳感器網(wǎng)絡(luò)系統(tǒng)設(shè)計方案,分析了傳感器網(wǎng)絡(luò)節(jié)點的硬件和軟件,可以用于監(jiān)測聲音信號,光照強(qiáng)度,溫濕度等多種環(huán)境參數(shù),完成環(huán)境參數(shù)的連續(xù)檢測和把數(shù)據(jù)實時發(fā)送到中心節(jié)點中。完成了 ZIGBEE無線網(wǎng)絡(luò)通信平臺的搭建,實現(xiàn)了小型的 ZIGBEE 星型網(wǎng)和網(wǎng)狀網(wǎng),串口觀測,表明傳感器節(jié)點的數(shù)據(jù)通過此網(wǎng)絡(luò)可以順利到達(dá)中心節(jié)點。 考慮到 系統(tǒng)的擴(kuò)展問題,把微控制器的所有I/O都引出,一方面方便調(diào)試,另一方面便于以后的功能擴(kuò)展。由于使用的傳感器種類較多,不可能對每個傳感器節(jié)點都開發(fā)一套全新的硬件系統(tǒng),固合理的分配的微處理器資源,硬件部分分為模塊化布置,選用及插及拔的器件和傳感器,通過標(biāo)準(zhǔn)接口自由組合。對于需復(fù)用的微處理器資源,軟件上采用設(shè)計合理的時間管理機(jī)制,分配使用微處理器資源,實現(xiàn)功能。目前搭建的平臺主要適用于倉庫環(huán)境監(jiān)控,因為它采用的是外部電源供電。 由于時間原因,很多預(yù)期的工作還未展開,整個系統(tǒng)還存在些不足,對于未來的工作,主要有以下 幾點:低功耗的實現(xiàn):傳感器節(jié)點采用電池供電模式,必須降低節(jié)點功耗,實現(xiàn)超長的待機(jī)時間。在無線傳感器網(wǎng)絡(luò)中,監(jiān)測事件具有很強(qiáng)的偶發(fā)性,節(jié)點上的所有的工作單元并不是始終處于工作狀態(tài)。所以可以讓其中一些節(jié)點處于關(guān)閉狀態(tài),我們稱之為睡眠狀態(tài),當(dāng)需要工作時再將其喚醒,這是一種有效的節(jié)能方案。 如何實現(xiàn)低功耗和工作協(xié)調(diào)發(fā)揮無線傳感器網(wǎng)絡(luò)的最佳工作狀態(tài)是一個有待解決研究課題。無線網(wǎng)絡(luò)的穩(wěn)定性:由于測量時間有限,整個無線網(wǎng)絡(luò)的搭建還不夠成熟,需要長時間的監(jiān)測、觀察。傳輸距離:目前空曠環(huán)境下有效的點對點傳輸距離僅為 100米左 右,如何擴(kuò)展傳輸距離也是無線網(wǎng)絡(luò)的一大難點。分析外界干擾(如障墻壁、玻璃、隔板等)、自身干擾對傳輸距離的影響程度。主要涉及到硬件設(shè)計和 MSP430單片機(jī) C編程兩方面的內(nèi)容。通過該設(shè)計,使得自己在學(xué)業(yè)上受益匪淺,它不僅要求我靈活應(yīng)用以前所學(xué)的知識,蘭州工業(yè)高等??茖W(xué)校 結(jié)論 26 也要求自己在工作中不斷學(xué)習(xí)和接受新知識,極大的鍛煉了自己獨立研發(fā)的能力,為今后的工作開創(chuàng)了新的前景。 蘭州工業(yè)高等??茖W(xué)校 致謝 27 致謝 在本次畢業(yè)設(shè)計和論文順利完成之際,向指導(dǎo)我的老師、關(guān)心我的親友、幫助我的同學(xué)致以最衷心的感謝! 首先要向我的指導(dǎo)老師 鄧翔宇副教授 表示由衷的感謝。在我做畢業(yè) 設(shè)計和論文期間,鄧 老師給我細(xì)心地指導(dǎo)和熱情的幫助, 他 悉心的指點,不但訓(xùn)練了我的思維,而且開拓了我的視野。 鄧 老師學(xué)識淵博、治學(xué)嚴(yán)謹(jǐn),待人坦誠,平易近人,在畢業(yè)設(shè)計的研制和論文寫作過程中,他審閱了我的文稿,提出了細(xì)致入微的意見。在這個過程中,我不僅學(xué)習(xí)了扎實的專業(yè)知識,也在如何待人處事等方面收益很多。同時,周老師勇于創(chuàng)新的作風(fēng)和銳意進(jìn)取的品質(zhì),給我留下了深刻的印象,使我受益匪淺。在此我謹(jǐn)向 周 老師表示衷心的感謝和深深地敬意。 感謝同學(xué)們,在我畢業(yè)設(shè)計過程中給我的大力支持,他們給了我學(xué)習(xí)和工作生活中無私的幫助、鼓勵 和支持,感謝他們在畢業(yè)設(shè)計和撰寫論文過程中給予我的幫助。讓我學(xué)到了很多以前不知道的專業(yè)知識和實踐經(jīng)驗,為我畢業(yè)設(shè)計和論文的完成打下了堅實的基礎(chǔ)。 所有幫助過過我的人,在此向他們表示由衷的謝意。感謝宿舍的 舍友 在生活學(xué)習(xí)中的關(guān)心幫助。把無盡的感激獻(xiàn)給始終如一的關(guān)心愛護(hù)我的父母,感謝他們一如既往的信任和支持,他們給予的親情是我前行的動力。 謹(jǐn)以此文,獻(xiàn)給我的老師、親人、朋友,還有那些為畢業(yè)設(shè)計付出的日子。 蘭州工業(yè)高等專科學(xué)校 參考文獻(xiàn) 28 參考文獻(xiàn) [1] 胡 航. 語音信號處理.哈爾濱工業(yè)大學(xué)出版社, [2] 刑建泉.新型語音 壓縮編解碼器 AMBE.國外電子元器件, [3] 胡漢才.單片機(jī)原理及接口技術(shù).北京:清華大學(xué)出版社, [4] DS1609 雙口 RAM 應(yīng)用手冊.國外電子元器件 [5] FLASH 存儲芯片應(yīng)用手冊 [6] T6668 應(yīng)用手冊.國外電子元器件 [7] RF2401 芯片應(yīng)用手冊 畢業(yè)設(shè)計(論文)評語 題目 基于 T6668 和 RF2401 的對講機(jī)設(shè)計 專業(yè) 通信技術(shù) 班級 通信 091 班 姓名 劉宏剛 指導(dǎo)教師評語: 指導(dǎo)教師(簽名) 年 月 日 答辯教師評語: 答辯委員會(分組)負(fù)責(zé)人(簽名) 年 月 日 g an employment tribunal claim Employment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: ? you don39。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。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。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。re clear about the terms of the agreement. It might be best to get advice from an experienced adviser, for example, at a Citizens Advice Bureau. To find your nearest CAB, including those that give advice by , click on nearest CAB. For more information about making a claim to an employment tribunal, see Employment tribunals. The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。s antiracism taskforce, is in London for the Football Association39。s 150th anniversary celebrations and will attend City39。s Premier League match at Chelsea on Sunday. I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport. For me it39。s about how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。s 21 win. Michel Platini, president of European football39。s governing body, has also ordered an immediate investigation into the referee39。s actions. CSKA said they were surprised and disappointed by Toure39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Age has reached the end of the beginning of a