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基于單片機的十字路口交通燈的設計.doc 21頁

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PAGE 9 摘要 近年來隨著科技的飛速發展,單片機的應用正在不斷深入,同時帶動傳統控制檢測技術日益更新。在實時檢測和自動控制的單片機應用系統中,單片機往往作為一個核心部件來使用,僅單片機方面知識是不夠的,還應根據具體硬件結構軟硬件結合,加以完善。 十字路口車輛穿梭,行人熙攘,車行車道,人行人道,有條不紊。那么靠什么來實現這井然秩序呢?靠的就是交通信號燈的自動指揮系統。交通信號燈控制方式很多。本系統采用MCS-51系列單片機AT89C51為中心器件來設計交通燈控制器,實現了能根據實際車流量通過8051芯片的P3口設置紅、綠燈燃亮時間的功能;紅綠燈循環點亮,倒計時剩5秒時黃燈閃爍警示(交通燈信號通過P1口輸出,顯示時間通過P0口輸出至雙位數碼管)。本系統設計周期短、可靠性高、實用性強、操作簡單、維護方便、擴展功能強。 關鍵詞:單片機;交通燈 Abstract In recent years, with the rapid development of science and technology, the application of SCM is going deep, driving the traditional detection techniques to renew day by day. In the real-time examination and in the automatic control monolithic integrated circuit application system, the monolithic integrated circuit often took a core part uses. The monolithic integrated circuit aspect knowledge is only insufficient, but should also act according to the concrete hardware architecture software and hardware union, to be improved. The intersection vehicles shuttle, the pedestrian is bustling, car dealership traffic lane, person sidewalk, methodical. Then depending on what to realizes this orderly order? the traffic lights on the automatic control system. There are great number kinds of modes to control the traffic lights. The system uses a series of MCS-51 as the center AT89C51 single-chip device designed to control the traffic lights, so as to realize the function of setting red, green light time by 8051 chip’s P3 port according to the actual traffic flows, lighting the red-light and green-light by turn and lighting the yellow-light to warm while 5 seconds left(outputting the traffic light signal by P1,outpuing the time by P0 and showing the time on double-digits nixie tube). Short of the design cycle, high reliability, practical, simple operation, easy maintenance, the expansion of powerful is this system. Key words: SCM; MCU; traffic light 目錄 TOC \o "1-2" \h \z \u 摘 要 1 1 設計要求 2 2 設計目的 3 3 方案比較、設計與論證 3 4 原理分析 3 4.1 交通燈顯示時序的理論分析 3 4.2 交通燈顯示的理論分析 5 5 程序設計流程圖

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