Serial communication with matlab

Projects Interfacing w/ Software on the Computer
1

hi!
I've been trying to send the values generated in the arduino to matlab for plotting. I got this code in the following linkhttp://allaboutee.com/2011/07/04/how-to-send-data-from-the-arduino-to-matlab/

This is the code for the arduino

int i=0;
void setup() 
{
  Serial.begin(9600);
}
 
void loop() 
{
   Serial.println(i);
   i++; 
}

and this is the code for matlab

clear all
clc
 
arduino=serial('COM4','BaudRate',9600);
 
fopen(arduino);
 
x=linspace(1,100);
   
for i=1:length(x)
	y(i)=fscanf(arduino,'%d');
end
	
fclose(arduino);
disp('making plot..')
plot(x,y);

I'm facing an error when I try to run the code for matlab. I've attached the error message. I know this might not be very appropriate place to ask question on matlab. But I believe there will be someone who can help me out who has dealt with arduino and matlab serial communication.

ard.jpg
ard.jpg1366×768 35 KB

2

Why did you waste bandwidth and force us to download a picture of text? Haven't you a clue how to copy text?

Why do you assume that the Arduino is on COM4? Matlab is telling you that it isn't.

3

Arduino is connected to the Com4...I don't know why Matlab is not recognizing it. I verified it in the device manager.

Apologies for wasting the bandwidth

4

Well the error shows COM4 is not available. Do you have the arduino serial console also opened at the same time?