【正文】
g of traditional control detection technology updates. In realtime detection and automatic control of the microputer application system, the microcontroller is often used as a core ponent, only the microcontroller is not enough knowledge, but also based on specific hardware structure of hardware and software bination to be improved. Crossroads shuttle vehicles, pedestrians bustling, car dealers driveway, people walkways, methodical. Then 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. The system uses this design uses a 74190 chip countdown control in each direction, connected with the two realized, also used the 74153 chip, because the time set Bottom of the analysis are five, so as long as 74,153 pairs of high position with a bit of the low initial prelocked to 5, while the high is provided as needed by the feedback part of the preset values. Green time of traffic flow can be detected by a doubledigit LED display. The system practical, simple, extending strong function. Keywords: microcontroller, traffic lights, Traffic flow 1 緒論 今天,紅綠燈安裝在各個道口上,已經(jīng)成為疏導交通車輛最常見和最有效的手段。綠燈時間可檢測車流量并可通過雙位數(shù)碼管顯示。交通信號燈控制方式很多。十字路口車輛穿梭,行人熙攘,車行車道,人行人道,有條不紊?;趩纹瑱C的交通燈控制器的設計與實現(xiàn)摘要:近年來隨著科技的飛速發(fā)展,單片機的應用正在不斷深入,同時帶動傳統(tǒng)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(tǒng)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(jù)具體硬件結構軟硬件結合,加以完善。那么靠什么來實現(xiàn)這井然秩序呢?靠的就是交通信號燈的自動指揮系統(tǒng)。本系統(tǒng)采用本設計采用74190 芯片倒計時控制,每個方向用兩片相連實現(xiàn),另外用74153芯片,因為分析中設置的時間末位均為5,所以只要用一片74153 對高位置位,將低位的初值預置鎖定為5,而高位則根據(jù)需要由反饋部分提供預置值。本系統(tǒng)實用性強、操作簡單、擴展功能強。但這一技術在19世紀就已出現(xiàn)了。這是世界上最早的交通信號燈。它由紅綠兩塊以旋轉式方形玻璃提燈組成,紅色表示“停止”,綠色表示“注意”。 1914年,電氣啟動的紅綠燈出現(xiàn)在美國。紅燈亮表示“停止”,綠燈亮表示“通行”。帶控制的紅綠燈,一種是把壓力探測器安在地下,當車輛接近時,紅燈便變?yōu)榫G燈;另一種是用擴音器來啟動紅綠燈,司機遇紅燈時按一下喇叭,就使紅燈變?yōu)榫G燈。紅外光束能把信號燈的紅燈延長一段時間,推遲汽車放行,以免發(fā)生交通事故。智能交通燈的管理比重