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.