Brief Analysis of Tasks and Circuits of Traffic Light Course Design

This article introduces the design tasks and hardware circuit design of the traffic light course design course. This course design uses digital circuit to design the traffic light control circuit. It briefly describes the circuit principle of designing simple traffic light. It proposes to make the traffic light control circuit automatically control the state transition of two sets of red, yellow and green traffic lights with digital signals. method. Through computer software simulation, the requirements of this design have been met, and it is hoped that in the future design, the gap can be checked and the traffic light system can be expanded and improved.

As the number of motor vehicles in the city continues to increase, many large cities such as Beijing, Shanghai, and Nanjing have experienced traffic overload. Therefore, since the late 1980s, these cities have built urban expressways and completed the construction of expressways. In the early days, they also effectively improved traffic conditions. However, with the rapid growth of traffic volume and the lack of systematic research and control of highways, highways have not fully played their intended roles. The structural characteristics of urban expressways also determine that the traffic conditions of urban expressways are bound by the traffic conditions of the coupling between expressways and ordinary roads. Therefore, how to adopt appropriate control methods, make the best use of the urban highways that cost huge amounts of money, ease the traffic congestion of the main roads and ramps, and the surrounding areas of the city, and become more and more urgently needed to be solved by the transportation management and urban planning departments. The main problem. Therefore, this time through the design of traffic lights, understand the working principle of traffic lights.

Design task of traffic light course design

Requirements: Design a traffic signal controller that combines a main road and a branch road into a crossroad, with red, green and yellow lights at each entrance. The red light is forbidden to pass, the green light is allowed to pass, and the yellow light is on to stop driving (the vehicle has time to stop outside the forbidden line). The two alternately allow passage. The main road is released for 40 seconds each time, and the main road is released for 30 seconds each time. The 40 seconds, 30 seconds timing and display circuit are set up. Every time by green

- 5 - When the light is on and the red light is on, the yellow light is illuminated for 10 seconds as a transition.

Hardware Circuit Design for Traffic Light Course Design

3.1 Design Ideas: The function of the traffic light system is mainly to control the red, green and yellow lights on the main road and the branch road to be turned on and off in an orderly manner. That is, within a certain period of time, a green light of a main road is bright, allowing vehicles and pedestrians to pass, while another The main road is red and no vehicles and pedestrians are allowed to pass. When the yellow light is on, it means that the pedestrians and vehicles passing the line continue to pass, and pedestrians and vehicles without the line are scheduled to wait. In order to realize this function of traffic, we need a display circuit to display the red, green and yellow lights on the main road and the main road. At the same time, we need a timing circuit that passes the time and time of 30s, 25s, 5s respectively. The output on the digital tube. Of course, before this we need a second pulse generation circuit to generate a 1 Hz pulse, and the entire circuit is processed in an orderly manner with the cooperation of the JK flip-flop and the timing pulse.