at what data rate should i take values? and how to code for it

1 vue (au cours des 30 derniers jours)
Amit Kadarmandalgi
Amit Kadarmandalgi le 7 Fév 2019
Commenté : Star Strider le 8 Fév 2019
I am using arduino matlab along with pulse sensor and I am not satisfied with the output as I dont think I am getting dicrotic curve I have written my current code and output that I am getting and what I am hoping to get. Also will any signal processing technique improve the output. please help.
output obtained
current code:
clear all
close all
clc;
a = arduino();
%%
v=zeros(500,1);
t=seconds(v);
t0=datetime('now');
for c=1:500
v(c) = readVoltage(a,'A0');
t(c)=datetime('now')-t0;
end
%%
plot(1:c,v);
title('Vata');
expected output

Réponses (1)

Star Strider
Star Strider le 7 Fév 2019
For cardiovascular data (including EKG) recording, the minimum sampling frequency is generally considered to be 250 Hz, giving a Nyquist frequency of 125 Hz. This will capture all the necessary data, and allow for filtering and other data processing. You can always downsample the data later if you want, however you cannot create data that you did not originally record.
  8 commentaires
Amit Kadarmandalgi
Amit Kadarmandalgi le 8 Fév 2019
but is it the same for PPG sensor?
Star Strider
Star Strider le 8 Fév 2019
@Amit — Try it.

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