Using Stateflow in Simulink for Square Wave Generation
1. Setting Up the Model in Simulink
Creating a Blank Model
Open MATLAB and Simulink
Launch MATLAB and open Simulink by clicking on the Simulink icon.
Create a New Model
Click on "Blank Model" to start a new project.
Adding Components
Add a Sine Wave Source
Click on the "Library Browser" and navigate to "Sources."
Drag and drop the "Sine Wave" block into your model.
Set the frequency of the sine wave to 1 Hz.
Add a Scope
Go to the "Sinks" section in the Library Browser.
Drag and drop the "Scope" block into the model.
Connect the output of the sine wave source to the input of the scope.
Configure the Model
Click on "Configuration Parameters" to adjust the settings.
Set the maximum step size to 1e-5.
Adjust the "Forward step" to 200,000 (or 2e5).
2. Creating the Stateflow Chart
Adding Stateflow to the Model
Insert a Stateflow Chart
In the Library Browser, navigate to "Stateflow."
Drag and drop the "Chart" block into your model.
Configure the Chart
Double-click the Chart block to open the Stateflow editor.
Inside the chart, create states and transitions based on the conditions you want.
Defining Conditions
Upper Condition
Create a state for the upper condition where the sinusoidal waveform is greater than 0.5.
Set the output to 0.5 in this state.
Lower Condition
Create a state for the lower condition where the sinusoidal waveform is less than -0.5.
Set the output to -0.5 in this state.
Transitions
Define transitions between states based on the input conditions:
From the lower state to the upper state if the input data is greater than 0.5.
From the upper state to the lower state if the input data is less than -0.5.
Generating a Square Wave
Update the Stateflow Chart
Ensure that the conditions and transitions are properly set to generate a square wave with an amplitude between 0.5 and -0.5.
Connect the Chart to the Scope
Connect the output of the Stateflow chart to the input of the scope.
3. Running the Simulation
Simulating the Model
Adjust Scope Settings
Change the style of the scope to visualize the output clearly.
Run the Simulation
Start the simulation by clicking the "Run" button.
Observe the output on the scope to verify that the generated waveform matches the expected square wave.
Results
When the amplitude of the sine wave is greater than 0.5, the output will be maintained at 0.5.
When the amplitude is less than -0.5, the output will be -0.5.
The resulting output will be a square wave with the desired amplitude.
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