MPU 9250 accelerometer Digital Signal Processing.

Hello I need to do a digital signal processing of the sensor MPU9250.

I need to find the Discrete Frequency and I have seen the matlab scripts.

My question is if I have two drones, one of them operates with a 11.1V and has vibrations around 252Hz and second operates at 22.4 and has vibrations around 168Hz

when I am computing my Amplitude do I use the following equation?

S = 22.1*sin(2*pi*168*t) + 11.1*sin(2*pi*252*t);

I have wrote a script for my fft

clear all;
close all; 
clc;

Fs = 4000;                         % Sampling Frequency
T = 1/Fs;                          % Sampling Period
L = 2048                           % Lenght of the signal
t = (0:L-1)*T;                     % Time Vector

% Assuming a sinusoidal wave of 252 Hz and apmlitude of 11.1V (Smsall drone)
%As well as a Sinusoidal wave of 168 Hz with a amplitude of %22.1V (larger
%drone)

S = 22.1*sin(2*pi*168*t) + 11.1*sin(2*pi*252*t);
X = S + 2*randn(size(t));

%Time Domain Plot of noise
figure(1)
plot(Fs*t(1:50),X(1:50))
title('Signal corrupted with zero mean randon noise')
xlabel('t (miliseconds)')
ylabel('X(t)')

%Create FFT of the signal
Y = fft(X);
P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);

%Find the Time Domain
figure(2)
f = Fs*(0:(L/2))/L;
plot(f,P1)
title('Single Sided Amplitude Spectrum X(t)')
xlabel('Frequency (Hz)')
ylabel('|P1(f)|')

%FFT of the original signal
Y = fft(S);
P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);

figure(3)
plot(f,P1)
title('Single sided amplituded spectrum of S(T)')
xlabel('f(Hz)')
ylabel('|P1(f)|')

Now I need to :

-Calculate the Binary numbers (please how do i do this!!!)

-Frequency in Z domain (Any sugestions???)

-Normalization (Help!!!)

[Samuel Louise]

Hi Mauro,

I am using the same sensor as you. would it be possible for you to share your code online?

thank

Sam

[Mauro Pango]

Hi Samule,

I can mail it to you, just send me your email.