• MATLAB Version 9.13 (R2022b) - MathWorks
• Simulink R2022b 10.6 (R2022b) - MathWorks
• MATLAB Support Package for Arduino Hardware (version 22.2.2) - MathWorks
• Simulink Support Package for Arduino Hardware (version 22.2.4) - MathWorks

Note: Compatibility with newer versions is not guaranteed. Verify if Simulink Coder is required for building/compiling.

In MATLAB:

1. Choose your board in the Simulink window:

   

2. Access Hardware Settings:

   

3. Configure your board specifics:

   

   • Change your board as needed.
     Note: Changing the board may reset some settings to default.

   

Select your COM port to upload to arduino.

4. Set the Solver Configuration:

   

   • Use fixed-step type.
   • Choose a discrete solver.
   • Set the fixed-step size carefully, as it is crucial for hardware performance.

   Note:
   With by 5$ chinese Arduino Uno, I choose 1ms (0.001) and got a lot of problems because the Hardware can't handle this speed.

   I don't know the root cause, but:

   • Fixed step size 0.001 (1ms) -> my Arduino Uno could make only 345 cycles in 1 second (should be 1000) -> 34.5%.

   • Fixed step size 0.003 (3ms) -> my Arduino Uno could make only 333 cycles in 1 second (should be 333) -> 100%, but I noticed some unstable situations.

   • Fixed step size 0.005 (5ms) -> my Arduino Uno could make only 200 cycles in 1 second (should be 200) -> 100%, working good.
     There is an example on RGB example about the calculation of cycles/second to check this.

5. Config the Code Generation:

Change the Build Configuration to 'Faster Runs' instead of 'Faster Build' to avoid errors.

If you are going to use SimStruct Functions, you must enable this.

Note: SimStruct has a lot of functions, specially in IO. For example, if you need to use a input in 'setup loop' of the Arduino, you must use SimStruct. You Can find SimStruct list here.

6. To deploy code:

• The option Monitor & Tune appers to be perfect, since you can see on Simulink's screen what is happening in Arduino, but it is so unstable. Got a lot of erros, delays, bugs.
  I dont recommend to use it.
  If you have a good performance with this, please let me know.

  

• Simulate to test logic within Simulink:

  

• Explore built-in blocks for Arduino in the Simulink Library Browser:

  

1. Set the language to C++ and ensure at least one input/output:

   

2. Code editing window structure:

   

   • Include necessary headers and set up your initialization and loop code within the defined sections.

There are 5 importants things:
a. Includes_BEGIN -> Here you put all you includes.
b. Start_BEGIN -> is same of void setup() of Arduino.
c. Output_BEGIN -> is the same of void lopp() of Arduino.
d. All code that must be executed INSIDE OF THE ARDUINO SCOPE must be inside of:

#ifndef MATLAB_MEX_FILE
//your Arduino code here
#endif

e. In the Includes_BEGIN, use:

 #include <Arduino.h>

3. Configure Ports and Parameters:

   

   • Define inputs/outputs for use within the Simulink logic.
     Note: Leave at least 1 input/output or you will get an error like: "expected primary-expression before 'void’"

4. Add custom library paths:

   

   • This allows the addition of custom libraries (e.g., AWS, LiquidCrystal, GPS). There is a lot of tricks to use this feature. Some of they, are:
     • Pay attention to relative paths(since the compile will be relative to the wrapper created)... You may use inside the folder of your projecte: INC_PATH with value ../folder/subfolder. Sometimes is better to include direct the folder, not relative path.
     • You need include both "lib.h" and "lib.cpp" files.
     • Most of time, you need to add some Core Files (e.g: SPI, WiFi) in the #include:
       • Pay attention with diference between Core libraries from Arduino and ESP32.
       • You can have multiple Arduino IDE installed, but Matlab/Simulink uses it own installation..
         (In matlab, use the command arduinoio.IDERoot to reach the files that Simulink uses).
       • To find ESP32 Core files, access:
         • Path got from arduinoio.IDERoot\portable\packages\esp32\hardware\esp32\1.0.6\libraries or cores.
       • To find Arduino Core files, access:
         • Path got from arduinoio.IDERoot\hardware\arduino\avr\libraries or cores.

5. Check the log for success:

   

   • Be aware that successful build messages can still occur despite code errors within the S-Function builder.