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how to plot the real time data from arduino in matlab.

272 vues (au cours des 30 derniers jours)
prajwal prabhu
prajwal prabhu le 6 Avr 2017
Commenté : Walter Roberson le 4 Juin 2022
the sensor that i am using is giving some output.how can i plot that in matlab
  2 commentaires
anil simsek
anil simsek le 6 Mai 2020
I have Arduino code, I want to draw it instantly in matlab. Can you help me
prajwal prabhu
prajwal prabhu le 6 Mai 2020
Could you please give more details on what is it that you are trying to achieve exactly , so that it will be easier for people to answer

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Réponse acceptée

Nick
Nick le 7 Avr 2017
Hi this is some old code I have that will plot the Arduino's analogread output. It will read continuously until it is stopped. I should also say that when I used the Arduino, the support package was not available so I was grabbing my data from the Arduino a different way (analogRead) than you might depending how you are connected to the Arduino.
%This is a script that will plot Arduino analogRead values in real time
%Modified from http://billwaa.wordpress.com/2013/07/10/matlab-real-time-serial-data-logger/
%The code from that site takes data from Serial
clear
clc
%User Defined Properties
a = arduino('Com13') % define the Arduino Communication port
plotTitle = 'Arduino Data Log'; % plot title
xLabel = 'Elapsed Time (s)'; % x-axis label
yLabel = 'Temperature (C)'; % y-axis label
legend1 = 'Temperature Sensor 1'
legend2 = 'Temperature Sensor 2'
legend3 = 'Temperature Sensor 3'
yMax = 40 %y Maximum Value
yMin = 0 %y minimum Value
plotGrid = 'on'; % 'off' to turn off grid
min = 0; % set y-min
max = 40; % set y-max
delay = .01; % make sure sample faster than resolution
%Define Function Variables
time = 0;
data = 0;
data1 = 0;
data2 = 0;
count = 0;
%Set up Plot
plotGraph = plot(time,data,'-r' ) % every AnalogRead needs to be on its own Plotgraph
hold on %hold on makes sure all of the channels are plotted
plotGraph1 = plot(time,data1,'-b')
plotGraph2 = plot(time, data2,'-g' )
title(plotTitle,'FontSize',15);
xlabel(xLabel,'FontSize',15);
ylabel(yLabel,'FontSize',15);
legend(legend1,legend2,legend3)
axis([yMin yMax min max]);
grid(plotGrid);
tic
while ishandle(plotGraph) %Loop when Plot is Active will run until plot is closed
dat = a.analogRead(0)* 0.48875855327; %Data from the arduino
dat1 = a.analogRead(2)* 0.48875855327;
dat2 = a.analogRead(4)* 0.48875855327;
count = count + 1;
time(count) = toc;
data(count) = dat(1);
data1(count) = dat1(1)
data2(count) = dat2(1)
%This is the magic code
%Using plot will slow down the sampling time.. At times to over 20
%seconds per sample!
set(plotGraph,'XData',time,'YData',data);
set(plotGraph1,'XData',time,'YData',data1);
set(plotGraph2,'XData',time,'YData',data2);
axis([0 time(count) min max]);
%Update the graph
pause(delay);
end
delete(a);
disp('Plot Closed and arduino object has been deleted');
  17 commentaires
Walter Roberson
Walter Roberson le 4 Juin 2022
When you create an arduino object and ask to analog read, then sampling rate is not a relevant question. The while loop runs however quickly it runs, almost certainly not consistent. Each iteration, the MATLAB host sends an analog read request along with information about what to read. That goes out over USB whenever USB gets around to it, and the command is interpreted by the arduino, which figures out what is being requested and executes the corresponding code, and then the arduino creates a response and sends it back over USB. All of this is asynchronous and irregular timing, so sample rate is not a relevant concept, unless you want to measure min, max, average on a particular set up (knowing it will change if Windows decides it is time to fetch email or defragment the hard drive or run a virus scan.)
If you to know about sample rate, you need to write code for the arduino side that is dedicated to reading the device and reporting back.
Walter Roberson
Walter Roberson le 4 Juin 2022
The sampling rate possible for temperature sensors depends on the sensor. I am finding rates of 1 sample/second or 1 sample per 2 seconds for some. I cannot seem to find statements on the sampling time of LM35 type sensors

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Plus de réponses (3)

Nguyet Minh
Nguyet Minh le 25 Sep 2019
Can I ask about the number "Data from Arduino". What is it means?
Thanks a lot
Data from the arduino.PNG
  3 commentaires
Gabriel Montijo
Gabriel Montijo le 17 Nov 2021
And what is the number that is being multiplied to?

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Tarun Shrivastava
Tarun Shrivastava le 14 Oct 2019
these are the physical pins of mega 2560

anil simsek
anil simsek le 6 Mai 2020
Arduino kodum var, hemen matlab'da çizmek istiyorum. Bana yardımcı olabilir misiniz

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