Using Servo Block with Simulink IO

Simulink IO currently supports the PWM output block in Normal mode, but I need to control a servo. The PWM output is at 1Khz, but a servo typically uses 50Hz. Is there any way to change the PWM frequency? My servos don't recogize 1Khz. I'm currently using a second Arduino to down convert 1Khz PWM to 50 Hz, but of course slows down the real time simulation.

Answer 1

[Arun Kumar]

Hi Jeff,

With Simulink IO, it is not possible to change the PWM frequency.

But for changing PWM frequency in external mode or deploy to hardware, there is a workaroud.

https://in.mathworks.com/matlabcentral/fileexchange/62702-rensselaer-arduino-support-package-library-rasplib

Use this Simulink library to change frequency on Arduino AVR boards. Note that this workaround will not work for Arduino ARM boards like Due/MKR1000.

Request for supporting variable PWM frequnecy on arduino is under consideration.

[Jeff Dillon]

Is there a time frame or a link to the status of the feature request for changing the PWM frequency?

[Arun Kumar]

Hi Jeff,

The feature is available in R2020a.

[Jeff Dillon]

Thank you! I downloaded 2020a and see the new frequency parameter for the PWM block, very nice.