How to convert a square wave to frequency domain in Matlab or simulink

Hi all,

I am so grateful, if you can give me some hints and advice for this issue.

I read a analog signal from my Arduino which is a square wave signal. I would like to obtain the frequency of this signal to do further control work. However, I do not know how to obtain it.

(1) I found some models with FFT function in simulink, but the input signal is DSP sine wave signal in these models. If I replace the input signal (DSP sine wave) with the square wave obtained from Arduino, these models will not work.

(2) If I do it in Matlab rather than Simulink, which fuction is valid in this case? And how can I convert the continuous signal in to frequency domain (or just get the value of the frequency) in Matlab?

Answer 1

[Shivam Kumar Singh]

You can use fft() function in Matlab.

https://www.mathworks.com/help/matlab/ref/fft.html

[yingcheng zan]

Thank you so much! I already tried this function, and it's very useful.