How to find FFT of the values generated from signal generator using Arduino?
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I have a data of values recorded from signal generator using aduino.I would like to find the fft of the signals.I gave a 15Hz sine wave with amplitude 2Vpk-pk but I am getting the wrong fft.Please help me.
X=load('data3.txt');
fs=256;
T=1/fs;
L=10000;
t = (0:L-1)*T;
Y=fft(X);
P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);
f = fs*(0:(L/2))/L;
plot(f,P1);
title('FFT Plot of a signal')
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/199442/image.jpeg)
3 Kommentare
Mark Sherstan
am 30 Jan. 2019
Theres lots of different ways but you could rerun your data acquistion and print a timer to record how long it takes to execute one loop (e.g. using micros(); on the Arduino). Then use MATLAB to calculate the difference between time steps using the diff function and average the vector to get an approximation of the sampling rate.
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