Traffic Light System Simulation with Stateflow in Simscape

In this final blog of our Physical Modeling in Simscape with Simulink & MATLAB series, we’ll implement a traffic light system simulation using MATLAB Stateflow. This example showcases event-driven control logic, making it a perfect case for Simscape for control systems. 

This blog is part of Skill-Lync’s Simscape Training, covering Simscape engineering applications through practical simulations. 

Understanding Traffic Light System Control Logic 

A crossroad traffic signal has two states: 

• State 1 (Green for North-South, Red for East-West) 
• State 2 (Green for East-West, Red for North-South) 

Each state remains active for 30 seconds, then transitions to the next. 

Building the Stateflow Traffic Light Model 

Define States in Stateflow: 

• N_S_Green: North-South lights Green, East-West Red. 
• E_W_Green: East-West lights Green, North-South Red. 

Set Transition Conditions: 

• After (30, sec) → Transition to next state. 

Use Dashboard Components: 

• Indicator Lamps show signal changes. 
• Graphical Interface enhances Simscape system design. 

Simulating the Traffic Light System 

Run the Simulation for 150 Seconds: 

• Observe state changes at 30-second intervals. 
• Visualize real-time traffic signal behavior. 

Analyze Stateflow Transitions: 

• Traffic lights change states dynamically. 
• Decision-making logic is time-driven. 

Conclusion 

This blog demonstrated how MATLAB Stateflow is used for event-driven control systems, such as a traffic light simulation. 

For hands-on learning, explore Skill-Lync’s Simscape Course Syllabus, which includes Simscape mechanical systems tutorials, Simscape electrical modeling, and multi-domain simulations. 

Stay tuned for more Skill-Lync Simscape Tutorials as we continue to explore physical modeling and simulation! 

This blog is part of our ongoing Physical Modeling in Simscape with Simulink & MATLAB. If you missed the previous posts, check them out here.  

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