【正文】 exactly how early it would be difficult to say, but in the course of centuries it was greatly added to and modified. It contains about 200 chapters, but no plete papyrus has been found. The chapters are quite independent of one another, and were probably all posed at different times. The main subject is the beatification of the dead, who were supposed to recite the chapters in order that they might gain power and enjoy the privileges of the new life. The work abounds in magical references. The whole trend of the Book of the Dead is thaumaturgic, as its purpose is to guard the dead against the dangers they have to face in reaching the other world. As in most mythologies, the dead Egyptian had to encounter malignant spirits and was threatened by many dangers before reaching his haven of rest. He also had to undergo judgment by Osiris, and to justify himself before being permitted to enter the realms of bliss. This he imagined he could in great part acplish by the recitation of various magical formula and spells, which would ward off the evil influences opposed to him. To this end every important Egyptian of means had buried with him a papyrus of the Book of the Dead, containing at least all the chapters necessary for encountering the formidable adversaries at the gates of Amenti, the Egyptian Hades. These chapters would assist him in making replies during his ceremony of justification. First among these spells were the words of power. The Egyptians believed that to discover the secret name of a god was to gain plete ascendancy over him. Sympathetic magic was in vogue in Egyptian burial practice, which explains the presence, in tombs of people of means, of paintings of tables laden with food and drink, with inscriptions attached conveying the idea of boundless liberality. Inscriptions like the following are extremely mon— To the ka [essential double or soul] of soandso, 5,000 loaves of bread, 500 geese, and 5,000 jugs of beer. Those dedications cost the generous donors little, as they merely had the objects named painted upon the wall of the tomb, imagining that their ka or astral counterpart would be eatable and drinkable by the deceased. This of course is merely an extension of the Neolithic conception that articles buried with a man had their astral counterparts and would be of use to him in another world. Pictorial representation played a considerable part in the magical ritual of the Book of the Dead. One of the pleasures of the dead was to sail over Heaven in the boat of Ra, and to secure this for the deceased one must paint certain pictures and mutter over them words of power. Regarding this belief, E. A. Wallis Budge states in his book Egyptian Magic (1889): On a piece of clean papyrus a boat is to be drawn with ink made of green abut mixed with anti water, and in it are to be figures of Isis, Thoth, Shu, and Khepera, and the deceased。 北京化工大學(xué)北方學(xué)院畢業(yè)設(shè)計(jì)（論文） 32 結(jié) 論 本設(shè)計(jì)采用 AT89S52 作為主控芯片，設(shè)計(jì)了一種智能的溫濕度自動(dòng)晾衣桿 。當(dāng)傳動(dòng)桿碰到位置開(kāi)關(guān) J3 時(shí)。根據(jù)設(shè)計(jì)的要求，和前面描述的控制系統(tǒng)硬件設(shè)計(jì)的具體情況，單片機(jī)控制系統(tǒng)軟件程序流程圖如圖 所示： 圖 程序流程圖 北京化工大學(xué)北方學(xué)院畢業(yè)設(shè)計(jì)（論文） 26 第 節(jié) 程序 設(shè)計(jì) C 語(yǔ)言是一種計(jì)算機(jī)程序設(shè)計(jì)語(yǔ)言。按圖中電流箭頭所示，該流向的電流將驅(qū)動(dòng)電機(jī)順時(shí)針轉(zhuǎn)動(dòng)。 本系統(tǒng)中利用光敏電阻的感光特性來(lái)檢測(cè)光線的強(qiáng)弱程度，通過(guò)檢測(cè)光線的強(qiáng)弱程度來(lái)判斷白天和黑夜，同時(shí)可輔助濕度傳感器檢測(cè)陰天與晴天， 其電路結(jié)構(gòu)圖如圖 所示： 北京化工大學(xué)北方學(xué)院畢業(yè)設(shè)計(jì)（論文） 19 圖 光敏檢測(cè)電路 電路中光敏電阻型號(hào)為 PGM5539， 系統(tǒng)實(shí)現(xiàn)原理是利用光敏電阻的光電特性即光敏電阻受光照時(shí)阻值小于無(wú)光照時(shí)來(lái)使系統(tǒng)工作。 如果讀取響應(yīng)信號(hào)為高電平，則 DHT11沒(méi)有響應(yīng)，請(qǐng)檢查線路是否連接正常 。 單片機(jī)各功 能部件的運(yùn)行都是以時(shí)鐘控制信號(hào)為基準(zhǔn)，有條不紊地一拍一拍地工作， 因此，時(shí)鐘頻 率直接影響單片機(jī)的速度，時(shí)鐘電路的質(zhì)量也直接影響單片機(jī)的穩(wěn)定性。這些中斷每個(gè)中斷源都可以通過(guò)置位或清除特殊寄存器 IE中的相關(guān)中斷允許控制位分別使得中斷源有效或無(wú)效。這一位置“ 1”， ALE 僅在執(zhí)行 MOVX 或 MOVC 指令時(shí)有效。 在 flash編程和校驗(yàn)時(shí)， P2口也接收高 8位地址字節(jié)和一些控制信號(hào)。對(duì) P0 端口寫“ 1”時(shí)，引腳用作高阻抗輸入。 系統(tǒng)檢測(cè)部分由 DHT11 型溫濕度傳感器和 5547 光敏電阻組成。而本設(shè)計(jì) 采用單片機(jī)作為智能晾衣架的檢測(cè) 及控制核心，通過(guò)溫濕傳感器探測(cè)外界環(huán)境的溫度和濕度，當(dāng)溫度或濕度達(dá)到一定指標(biāo)時(shí)，單片機(jī)控制電動(dòng)機(jī)正轉(zhuǎn)（或者反轉(zhuǎn)）從而使衣架自動(dòng)收回，當(dāng)傳動(dòng)桿接觸到位置開(kāi)關(guān)時(shí)，電機(jī)停止轉(zhuǎn)動(dòng)；當(dāng)雨停后，陽(yáng)光充裕時(shí)，光敏電阻將信息反饋給單片機(jī)，單片機(jī)再控制電動(dòng)機(jī)反轉(zhuǎn)（或者正北京化工大學(xué)北方學(xué)院畢業(yè)設(shè)計(jì)（論文） 3 轉(zhuǎn)）從而使衣架自動(dòng)伸出接收晾曬。s daily life more convenient, but airing tool or in a primitive level almost no change, gradually and our life away. For now the city where most people are busy with their work every day, hardly ever at home, when weather changes will be unable to recover. About this question, the intelligent clothes hanger system is studied, using the DHT11 temperature and humidity sensor, 5547 photosensitive resistance signals transmitted to the system processing core chip AT89S52, according to the time of the temperature and humidity and light intensity to judge whether to take back the clothes hanger. When the air relative humidity exceeds a set value ( think it39。 炎熱夏日， 上班族通常是把 衣物晾曬在室外一整天。 （ 2）觀察法。 系統(tǒng)電機(jī)部分采用 H 橋直流電機(jī)驅(qū)動(dòng)， H 橋電路是直流電機(jī)使用最廣泛的一種驅(qū)動(dòng)電路。 P1 口： P1 口是一個(gè)具有內(nèi)部上拉電阻的 8 位雙向 I/O 口， p1 輸出緩沖器能驅(qū)動(dòng) 4個(gè) TTL 邏輯電平。在 flash編程和校驗(yàn)時(shí)， P3口也接收一些控制信號(hào)。 EA /VPP:訪問(wèn)外部程序存儲(chǔ)器控制信號(hào)。它們?yōu)?AT89系列新產(chǎn)品預(yù)留。 傳感器上電后 ，要等待 1s以越過(guò)不穩(wěn)定狀態(tài)在此期間無(wú)需發(fā)送任何指令 。 因此該產(chǎn)品具有品質(zhì)卓越、超快響應(yīng)、抗干擾能力強(qiáng)、性價(jià)比極高等優(yōu)點(diǎn) 。 直流電機(jī)的結(jié)構(gòu)應(yīng)由定子和轉(zhuǎn)子兩大部分組成。如果三極管Q1 和 Q2 同時(shí)導(dǎo)通，那么電流就會(huì)從正極穿過(guò)兩個(gè)三極管直接回到負(fù)極。 第 節(jié) 系統(tǒng)初始化 軟件系統(tǒng)設(shè)計(jì)設(shè)置包括聲明庫(kù)函數(shù)如： include， include 等，溫濕度檢測(cè)采用 DHT11 溫濕度傳感器，由于 DHT11 的單總線方式，數(shù)據(jù)的讀寫都占用同一根線，所以每一種操作都必須嚴(yán)格按照時(shí)序進(jìn)行。繼電器 J7得電，常開(kāi)觸點(diǎn)閉合，控制電機(jī)的反轉(zhuǎn)，晾衣架伸出，自動(dòng)實(shí)現(xiàn)晾衣動(dòng)作。如今，伴隨著這篇畢業(yè)論文的最終成稿，復(fù)雜的心情煙消云散，自己甚至還有一點(diǎn)成就感。 thus the one picture was capable of being two boats. And, provided the proper offerings were made for the deceased on the birthday of Osiris, his soul would live for ever, and he would not die a second time. According to the rubric to the chapter in which these directions are given, the text of it is as old, at least, as the time of Hesept, the fifth king of the 1st. dynasty, who reigned about 4350 . , and the custom of painting the boat upon papyrus is probably contemporaneous. The words of power were not to be spoken until after death. They were a great mystery, but the eye of no man whatsoever must see it, for it is a thing of abomination for every man to know it. Hide it, therefore, the Book of the 北京化工大學(xué)北方學(xué)院畢業(yè)設(shè)計(jì)（論文） 36 Lady of the Hidden Temple is its name. This would seem to