I want to add two pulse generator in simulink and dump it into arduino uno...the result i am getting is change in the frequency at arduino output what i have set in pulse generator?

i want to generate 0.02 (50 hz) time period pulse by adding this two pulse generator, i am getting the output from the arduino but frequncy is not 50 hz, kindly suggest

this is the pulse i want to generate at arduino output for 0.02 time period.

Answer 1

[Madhu Govindarajan]

The correct way would be to have one pulse generator with period 0.02 seconds and appropriate Pulse Width. Adding two blocks does not add their sampling periods, it instead adds the contents within the same sampling period.

[Aniket Manjare]

But how can i generate this pattern of pulses at different time delay for 0.02 time period?

kindly help me to generate this pulse pattern at 50hz at arduino's output

Answer 2

[Madhu Govindarajan]

Here is what I would recommend -

1) Create a new Simulation only model and put two pulse generators both with a sampling period of 0.02.

2) Adjust the square waves as you see fit and add them up and send it to a scope.

3) Simulate this model and make changes as you see fit.

4) Once you have established you have the square wave of your choice, then bring it back into Arduino model and send it to the digital pin.

[Aniket Manjare]

I have executed this by keeping the sampling period 0.02 for the both pulse generator. i have got my pulse in the scope as well as on the DSO... but i am not getting the 50hz frequency at output of Arduino digital pin. How can i overcome this problem?

[Madhu Govindarajan]

So what do you mean when you can generate it on the DSO? Is it that you are using a signal generator there? or Arduino's digital pin output is measured there and it is correct frequency on the DSO?

What is the frequency you are getting on the Arduino digital pin? How are you measuring this?

Can you share your model?

[Aniket Manjare]

Arduino's digital pin output is measured on the DSO and the frequency i am getting on the DSO is not correct. I am getting 400Hz frequency on pin 9 of arduino. Instead of 400Hz it must me 50Hz.

[Madhu Govindarajan]

Thanks for that response, it is odd that the frequency is 400 Hz. If you can share the new model that would be great, as other users can chime in with their expertise as well.

[Aniket Manjare]

For this Configuration i have got the pulse at arduino digital pin output but frequency i am not getting 50hz frequecy at DSO

I have kept the time period 0.01 so atleast i should get 100Hz, but its not

Answer 3

[Madhu Govindarajan]

Here is what I think is going on - the model is overrunning itself as the sample time for model is small (0.000625 or 1600 Hz). To detect and fix task overruns - https://www.mathworks.com/help/supportpkg/arduino/ug/detect-and-fix-task-overruns-on-arduino-hardware.html

You can also try deploying to hardware, which might avoid overruns sometimes (you are only reducing the scope overhead). Although I doubt it would help at this sampling rate.

[Aniket Manjare]

Thank YOU! for helping us to solve the issue.

[Madhu Govindarajan]

Sure thing.

[MITHUN P S]

Sir Iam not able to create high frequency from matlab arduino digital out pin using simulink plss help its urgent...

Answer 4

[bella risky ananda]

Hi all...I have problem set PWM frequency for SIMULINK support package of Arduino..I am using MATLAB 2017b and arduino mega2560...for the control i need a PWM signal 25000 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. If you don't mind, can I ask for a soft file of simulink simulation as a reference for my final assignment. I still didn't understand for change pwm frequency arduino in simulink matlab.

Thank you

[Arun Kumar]

Use this Library to change frequency of PWM.

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

Using this library, you can configure PWM to some extent.

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

[bella risky ananda]

thank you very much for helping and this is very helpful..