Abstract
In recent decades, growth and maturity of China's infrastructure, with the rapid
development of urbanization, convenient and smooth road traffic is becoming an important part
of our socialist construction. Because the vehicle's explosive growth, especially the key
management and control of traffic construction in our country, it has a profound and important
influence the traffic safety.
Now, use signal control lamp and the emergence of the underground safety, maintenance
and management of traffic, not only convenient and automatic. Digital signal circuit, not only
low power consumption, but also a variety of, convenient people's life. People, cars, roads, the
three aspects of the unity of our more thinking and solving, three coordinate all aspects of
development, and promote social and economic value and the development of human beings.
Because the city traffic problems, people more and more, traffic lights have mediation of vehicle
traffic flow control efficiency, improve and enhance the efficiency of the vehicle, can reduce and
prevent a series of traffic problems. Crossroads vehicle endless back and forth, many pedestrians,
good order and arrangement is the first element to ensure safety of roads and sidewalks. To do
this for the sake of what? For this traffic light system in the urban road traffic.
In this design, I chose the AT89C52 single chip microcomputer as control core, and the auxiliary
power circuit, reset circuit, key circuit, the human body sensor, the digital tube display, LED
lights, according to the buzzer alarm, crystal oscillator circuit and control circuit to achieve
traffic light system can be realized.
Through transport and other work, can according to different traffic lights north, south, east
and west of the traffic lights, when the last into the 5 second countdown, yellow lamp has been
flashing alert pedestrians and vehicles to the change of the traffic lights. In addition, we can use
the principle of infrared sensor to detect road traffic violations, and the police. Once have urgent
need for methods, the north and south, east and west all street lamps variables is red, then a ban
on vehicle traffic, emergency vehicles out of the way. Need to stop, all the connection mode of
green, vehicle parking is prohibited. Because of the particularity of the evening, the four corners
of the world turning yellow light, vehicle according to the situation carefully. The design of
traffic light system is simple and easy to operate, and expansion of the two aspects of the strong.
There is a considerable practice.
Key word AT89S52; Traffic lights; In violation of the detection
