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Using Stateflow in Simulink for Square Wave Generation

Using Stateflow in Simulink for Square Wave Generation


1. Setting Up the Model in Simulink

Creating a Blank Model

  1. Open MATLAB and Simulink

  • Launch MATLAB and open Simulink by clicking on the Simulink icon.

  1. Create a New Model

  • Click on "Blank Model" to start a new project.



Adding Components

  1. 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.

  1. 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.

  1. 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

  1. Insert a Stateflow Chart

  • In the Library Browser, navigate to "Stateflow."

  • Drag and drop the "Chart" block into your model.

  1. 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

  1. 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.

  1. 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.

  1. 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

  1. 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.

  1. 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

  1. Adjust Scope Settings

  • Change the style of the scope to visualize the output clearly.

  1. 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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