单片机控制交通灯电路的设计

Design of Traffic Light Circuit Controlled by Single Chip Microcomputer

城市道路车流量大,经常出现"堵车"现象,改善红绿灯处交通灯控制系统十分必要。因此,对十字路口交通灯控制电路系统进行设计。设计中除了具备交通灯的基本功能外,还要具备倒计时功能。有的路口由于人流量不固定,设计中还加入了手动控制功能。该系统以单片机中的AT89C51为中心来设计交通灯的控制器系统。该系统能够根据实际车流量,由89C51的P3口设置红、绿灯点亮时间的功能。红灯和绿灯循环点亮,黄灯在倒计时剩5S时闪烁警示。

Urban road traffic flow is large,often appear "traffic jam" phenomenon. It is necessary to improve the traffic light control system at the traffic lights. In addition to the basic function of traffic lights, the design also has the countdown function. In some intersections, because the flow of people is not fixed, manual control function is added in the design. This system takes AT89C51 as the center to design the traffic light controller system. The system can set the time of red and green lights according to the actual traffic flow through the P3 of 89C51. The red light and green light are on in cycle,and the yellow light flashes when 5S is left in the countdown.