【正文】 improvement. With the fact that the largescale integrated circuit and the puter art promptness develop, as well as artificial intelligence broad in the field of control technique applies, intellige nce equipment has had very big development , the main current being that modern science and technology develops direction. The main body of a book is designed having introduced a intelligence traffic light systematically. The function being intelligence traffic light navar39。s only realizing intellectualized administration of crossroads traffic light , use operation in controlling the vehicular traffic regularity. With the worldwide urbanization and motorization speed up the process, city traffic has increasingly bee a global problem. Urban transport infrastructure lags behind the supply of mobile highspeed grow th of demand, the increasing road congestion, frequent accidents, enviro n mental pollution, such as increased prevalence of the problem. Especially in some developing 哈爾濱工業(yè)大學 華德應用技術學院 畢業(yè)設計（論文） 21 countries, not only in urban planning, urban transportation development model operator and the mechanism of choice in areas such as urban transport development in the developed countries to draw experience and lessons, and repeated them in the devel opment of highspeed mobile mitted over the Many mis takes, both large and mediumsized cities or emerging small and mediumsized cities, almost no forwardlooking to solve urban traffic problems. Since the reform and opening up, China39。 at the same time can save manpower and material resources, petence and plex collection of traffic information and many other human can not be pleted. In the late 1970s to the early 1990s, urban traffic control center is set up traffic control signal 哈爾濱工業(yè)大學 華德應用技術學院 畢業(yè)設計（論文） 23 systems and television traffic control system, w hose main function is to carry out traffic lights junction, bine the control of road traffic conditions in real time Surveillance, supported by human intervention. From the beginning of the end of the 1990s, China39。s major cities to ease urban traffic jams have been taken to new technology and to raise the level of scientific management, such as from a control point, to the regionbywire control, until now the Intelligent Transportation Systems, the electronics, sound Like the puter, such as GPS and hightech onesoluble, so that more and more traffic to the wisdom of the management system on the road. Intelligent tr affic system at the junction of the (above) no traffic management, and be able to rely on the automatic adjustment phase of the signal system to direct traffic in an orderly manner and at the same time the use of radio, video, information boards, and other technical means to the region at road junctions (above) the traffic situation At any time inform the driver, so that it can choose in advance the smooth flow of traffic on the road to traffic, urban road work can be more balanced and full use of. Intel ligent Transportation System will considerably enhance the city39。s brought it39。路口信號控制器是控制交叉路口交通信號的設備，它是交通信號控制的重要組成部分。我們能盡快引進先進管理技術與設施，使城市道路交通置于先進科學的系統(tǒng)管理之下，讓現(xiàn)有城市道路網(wǎng)及相關設施的潛能充分發(fā)揮出來。這不僅要求道路要越來越寬闊，而且要求有新的交通管理模式的出臺。 由于我國經(jīng)濟的快速發(fā)展從而導致了我國汽車的猛增，從而導致了交通問題的日益嚴重，其主要表現(xiàn)如下：交通事故頻繁發(fā)，對人類的生命安全造成了極大的威脅；交通擁堵嚴重，導致出行時間增加；空氣污染和噪聲污染 哈爾濱工業(yè)大學 華德應用技術學院 畢業(yè)設計（論文） 18 日益加深等。本文主要從單片機的應用上來實現(xiàn)十字路口交通燈智能化的管理，用以控制過往車輛的正常運作。 最后要感謝學院給我提供了一次很好的實踐機會，在這次 畢業(yè) 設計期間，無論是從技術上還是從對環(huán)境的適應能力上來講， 都 對我今后的學習打下了一個良好的基礎 ，通過這次設計，將大學期間所學的知識應用到了實際的電路設計中，在以后的工作和學習中，解決問題和學習更多的知識時必將更加得心應手 。 在這里首先要感謝我的指導老師林玉江老師。 （ 5） 完成軟件程序的編寫和仿真，編寫主程序的循環(huán)點亮紅黃綠燈，按鍵電路的去抖和中斷程序的設計，同時需要設計延時電路的方式和計算其初值。 哈爾濱工業(yè)大學 華德應用技術學院 畢業(yè)設計（論文） 14 結論 交通燈系統(tǒng)在實際應用中有十分重要的作用。 共陰極七段數(shù)碼管引腳圖如下： 哈爾濱工業(yè)大學 華德應用技術學院 畢業(yè)設計（論文） 12 圖 43 七段共陰極數(shù)碼管引腳圖 圖 44 共陰 極 LED 數(shù)碼管的內部結構原理圖 如圖 44， A， B， C， D， E， F， G， DP 分別為七段發(fā)光二極管，當其對應引腳 1， 2， 4， 5， 6， 7， 9， 10 高 電平時， 數(shù)碼管與其對應的 二極管發(fā)光。 LED 數(shù)碼管常用段數(shù)一般為 7 段有的另加一個小數(shù)點，還有一種是類似于 3 位“ +1”型。 AT89C52 單片機 是一個低電壓，高性能 CMOS 8 位單片機 ，與同類產(chǎn)品相比有性價比高，程序寫入簡單，調試方便的特點。如 EA 端為高電平， CPU 則執(zhí)行內部程序存儲器中的指令。而 在今后，單片機 已明顯地朝三個方向發(fā)展 即 ：巨型化，單片化，網(wǎng)絡化 。 1973 年8 月，霍夫等人研制出 8 位微處理器 Intel 8080，以 N 溝道 MOS 電路取代了P 溝道，第二代微處理器就此誕生 。并列出了方框圖和整機電路圖。 由于單片機需要高穩(wěn)定，高頻率的實時脈沖， 因此需要晶體振蕩器。單片機控制交通燈主要由單片機及其晶振電路，復位電路，數(shù)碼顯示電路，紅黃綠顯示電路組成。 同時 隨著城市化的發(fā)展，交通燈在生產(chǎn)生活中占有越來越重要的地位。設 A 車道和B 車道交叉組成十字路口， A 是主道， B 是支 道。 當前，大量的信號電路正向著數(shù)字化、小功率、多樣化 發(fā)展， 方便人、車、路 三者關系的協(xié)調，多值化方向發(fā)展。它由紅綠兩色旋轉式方形玻璃提燈組成，紅色表示 “ 停止 ” ，綠色表示 “ 通行 ” 。然而， 交通擁堵問題也成為了急需解決的課題。 關鍵詞 ： 交通燈， 單片機，數(shù)碼顯示 哈爾濱工業(yè)大學 華德應用技術學院 畢業(yè)設計（論文） II Abstract With the rapid development of science and technology in recent years,The traffic light has being increasingly important in traffic control and shuttle vehicles,pedestrians bustling,car dealers driveway, People walkw ays, rely on to achieve this discipline of the order of It?Is the traffic lights by the automatic control system. Traffic signal control many ways. Based on the actual traffic situation in urban and rural areas,this design expounds the operational principles of control system of traffic light and give a simple and practical ci