I want to get an external analog signal via arduino and then perform its FFT. Kindly Help

I got the signal vector of my analog data via arduino but I couldnt determine the time length of signal thus the FFT couldnt be performed. The X-axis of FFT should be in Hertz.

a=arduino('com10','Mega2560')

v=zeros(1000,1);

t=seconds(v);

t0=datetime('now');

for ii=1:1000

v(ii)=readVoltage(a,'A0');

t(ii)=datetime('now')-t0;

end

Y=fft(v);

Answer 1

[Githin John]

The comments on this question might help you

https://www.mathworks.com/matlabcentral/answers/436616-how-to-find-fft-of-the-values-generated-from-signal-generator-using-arduino