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This paper presents a software-based traffic light experiment control system developed using LabVIEW, a virtual instrument programming platform. The system is designed to simulate the operation of traffic lights without relying on traditional logic control hardware. It allows students to gain hands-on experience in understanding and implementing software-based control methods for traffic signals. Compared to conventional approaches such as PLCs or microcontrollers, this LabVIEW-based system enhances the learning process by offering a more intuitive, visual, and cost-effective solution for educational purposes.
**1. Introduction to LabVIEW**
LabVIEW is a powerful graphical programming environment widely used in industries, academic research, and engineering applications. As a virtual instrument (VI) platform, it enables users to design and implement complex systems through a visual interface. LabVIEW supports a wide range of functionalities, including data acquisition, signal processing, and real-time control. Each VI consists of two main components: the front panel, which serves as the user interface, and the block diagram, where the actual logic and functionality are implemented. This dual structure makes LabVIEW an excellent tool for both teaching and practical development, allowing users to create interactive and dynamic systems with ease.
**2. Traffic Light Control System Design**
**2.1 Control Scheme**
Traffic lights at intersections typically operate under three main control schemes. The first is the traditional method, where vehicles must come to a full stop before a green light turns red, and a yellow light provides a brief buffer. The second involves adding a green flash at the end of the green phase to signal its impending change. The third is a digital countdown display showing the remaining time for each light. This paper combines the first and third methods to simulate a realistic traffic light system that includes both visual cues and time displays.
**2.2 Front Panel Design**
The system simulates a four-way intersection with traffic lights in all directions—north, south, east, and west. Each direction has three lights: red, yellow, and green. Using LabVIEW 2012, we created a new VI named "Traffic Light Simulation." On the front panel, we added 12 round lights representing the traffic signals. By adjusting the properties of each light, we set their colors and visibility based on the program's logic. We also included numerical input and display controls to set and show the timing for red and green lights. These settings are saved so that the last configured values remain available after the program restarts.
With the growing number of vehicles, urban traffic congestion has become a serious issue, especially during peak hours. Traditional traffic lights often fail to adapt to real-time conditions, leading to inefficiencies and delays. An intelligent traffic light system can significantly improve traffic flow by dynamically adjusting signal timings. In our simulation, we added features such as setting specific directions to be restricted or prioritized, allowing the system to mimic real-world scenarios and enhance student understanding of traffic management strategies.
**2.3 Block Diagram Design**
**2.3.1 Normal Operation of Traffic Lights**
On the block diagram, we used conditional structures to manage different traffic states. A stacked sequential structure was chosen to save space and organize the logic efficiently. The sequence starts with all lights turned off. Then, depending on the current phase, the appropriate lights are activated, and the countdown timers are updated accordingly. For example, when the north-south direction is active, the east-west lights turn red, and the countdown for the red light begins. Similarly, the yellow light flashing logic is implemented to indicate the transition between phases.
**2.3.2 Traffic Control Scenarios**
To simulate real-world traffic control, the system includes options to switch between different modes, such as prioritizing one direction over another. When traffic control is enabled, the block diagram enters a true branch, where specific lights are activated based on the selected mode. This flexibility allows the system to demonstrate how traffic lights can be adjusted in response to changing conditions, providing a more realistic and interactive learning experience for students.
Industrial Waterproof Monitor: Perfect Integration of Protection and Function
In industrial environments, various complex conditions place extremely high demands on the performance and reliability of equipment. Industrial waterproof displays have emerged, bringing many conveniences to industrial production and operation with their unique design and powerful functions.
1〠The role of waterproof computer monitors
Protective equipment: outdoor waterproof monitors have excellent waterproof performance, which can effectively prevent the invasion of moisture and moisture, avoid equipment short circuits, damage and other problems caused by liquid contact, and thus extend the service life of the display.
Ensure stable operation: In humid and watery environments, such as food processing workshops, chemical plants, etc., waterproof displays can work continuously and stably without being affected by water vapor, ensuring the smooth progress of the production process.
Reduce maintenance costs: Due to its excellent waterproof performance, it reduces the number of failures and repairs caused by water ingress, and reduces the maintenance costs and risk of production interruption for enterprises.
Improving safety: In places where liquid splashes or leaks may occur, waterproof displays can prevent electrical accidents and ensure the personal safety of operators.
2〠Application scenarios of industrial waterproof Touch Screen Monitor
The food and beverage industry: In food processing and beverage production lines, equipment often needs to be cleaned due to high humidity and the possibility of liquid splashing. Industrial waterproof monitor can be installed on production lines, displaying real-time production parameters and monitoring production processes to ensure product quality and production safety.
Chemical industry: There are various chemical substances and liquids in chemical plants, which have strong environmental corrosiveness. Waterproof displays can resist the erosion of chemical substances and are used to monitor chemical reaction processes and display instrument data.
Medical industry: In areas such as disinfection supply rooms and operating rooms in hospitals, frequent cleaning and disinfection are required due to high humidity. Industrial waterproof displays can be used as operating interfaces for medical equipment, providing clear and accurate information for medical staff.
Ships and marine engineering: In the cockpit, engine room, and other parts of ships, they are easily affected by seawater droplets and humid air. Waterproof displays can work normally in harsh marine environments, providing reliable display support for ship navigation and equipment operation.
Outdoor and harsh environments: Outdoor workplaces such as mines and oil fields may encounter weather conditions such as rain, sand, and dust. Industrial waterproof displays can display normally under these harsh conditions, helping workers operate and monitor equipment.
In summary, industrial waterproof monitor play an important role in many industrial fields due to their excellent waterproof performance, providing strong guarantees for the efficient, stable, and safe operation of industrial production.
September 15, 2025