How to change PWM Frequency of Arduino USING MATLAB SIMULINK Support package

Hello,

i have problem with my project. I use Arduino uno and Simulink. For the control i need a PWM signal with 3000 Hz - 5000 Hz but the Simulink support package (PWM) has only 490 Hz and i can change only the duty-cycle.

What can I do?

I would welcome your response

[oday]

Have you found any solution to your problem, regards

[Andrew Teh]

I have the same problem, do you already know if there is any function to perform this action?

[orlem lima dos santos]

I would try to create a s-function where I could configure the timer of my arduino for a pwm frequency different from the default

look at this link https://arduino-info.wikispaces.com/Arduino-PWM-Frequency it has tips of how to change arduino pwm frequency

[oday]

Please orlem lima dos santos if you have already did it as s-function I will very grateful for you if you can send me it.

thank in advance

[orlem lima dos santos]

hi I didn't do, but I already did some s-functions in arduino and works. I recommend this tutorial https://www.youtube.com/watch?v=L86n9wZZz-g that I used to perform the task.

[Gustavo Mattos]

I have the same problem. Have you found any solution? Thanks a lot.

[Gustavo Mattos]

I guess I figured out how to deal with it. On "Model Configuration Parameters" window, click on "Code Generation" then on "Custom Code". On the panel titled as "Insert custom C code in generated:", click on Initialize Function. On its right, on the blank panel, type the code you need. In my case, I typed:

TCCR1B = (TCCR1B & 0b11111000) | 0x01; //~=32kHz on pin 10

Click apply, OK and then, run.

[oday]

Have you checked it if its working or not?

thanks

[Jan]

@oday: Please use flags only to inform admins and editors about contributions, which violate the terms of use, e.g. by rudeness or spam. Thanks.

[Pascal Messier]

@Gustavo I try it with an Arduino Uno. Does not work. Is it working for you?

[pallab choudhury]

Hi all...I am also facing same issue to set PWM frequency for MATLAB support package of Arduino..I am using 2017b...how to solve this in MATLAB model (Not Simulink)?..could you please share?

[HARITA UPPAL]

Facing the same issue, I am not able to generate more than 1 KHz PWM for arduino in simulink as well as in matlab code. Can anyone help in this regard?

[Ken Noé]

I had quite the same problem (needed 5 - 25 kHz for my DC-motor to work), so I wrote my own S-function, which I will attach.

By using a prescaler of 8 for the timer 2, the outcoming frequency at D3 and D11 is approximately 7.8 kHz. You can also use a prescaler of 1 (to get 62.5 kHz) or 64 (to get 980 Hz), if you take a look inside the S-function -> Start --> TCCR2B.

You'll also need the following requirements for the simulink-model in order to work:

• Arduino Uno
• Matlab R2019a or newer
• Add-Ons: Matlab+Simulink Support for Arduino, MinGW-w64 C/C++ Compiler
• run in "External"-mode, Simulation stop time: "inf"

I hope this will help you with your project.

Best regards

[Joseph Humphreys]

@Ken Noé

Can you use your S-functions for an Arduino Mega 2650? I've tried using it for an Uno and it works but when I switch to the Mega 2650 there is no output from the PWM pin.

[Daniel Velazquez]

You can change the frequency in Simulink just double click on the PWM block in the Frequency drop down menu select: Specify and write your desired frequency in Hz.

The problem is the higher the frequency (>100kHz) the lower the resolution of the PWM, but at 5kHz you should have no problem.

...as of July 8, 2021 with ATMEGA 2560.

Answer 1

[Greg Wolff]

You cannot change the PWM frequency of the PWM block found in the Arduino hardware support package.

You can however create custom device driver blocks. There is a good resource here:

https://www.mathworks.com/matlabcentral/fileexchange/39354-device-drivers

that has various examples, all built around supporting Arduino boards.