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Serial Communication App Designer

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Hello! I m quite new in App Designer so I m gonna ask for your help. I need to open a serial communication with my Arduino. I have some erros though and I cannot understand why:
delete(instrfind)
arduinoo =arduino('COM6');
arduinoo=serial('COM6');
set(arduinoo, 'BaudRate', 115200);
arduinoo.Terminator = 'CR';
y=zeros(1);
s11=zeros(1);
s12=zeros(1);
s13=zeros(1);
s14=zeros(1);
i=1;
l2=0;
arduinoo.BytesAvailableFcnCount = 40;
arduinoo.BytesAvailableFcnMode = 'byte';
arduinoo.BytesAvailableFcn = @instrcallback;
fopen(arduinoo);
if isvalid(arduinoo)
tstart=now();
while 1<2
data=fscanf(arduinoo);
if real(str2double(data))< 5 & real(str2double(data)) >1.75
l2 = (now()-tstart)*24*60*60;
for j=1:1000
data=fscanf(arduinoo);
y(i+j)=real(str2ouble(data));
app.sa = 'DA';
end
break;
end
fclose(arduinoo);
delete(instrfind);
end
Here is my error:
Error using serial/fscanf (line 153)
Unsuccessful read: Instrument object OBJ is an invalid
object..
data=fscanf(arduinoo);
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 309)
Error while evaluating Button PrivateButtonPushedFcn.
Thank you in advance for any help!

Accepted Answer

Harsha Priya Daggubati
Harsha Priya Daggubati on 15 May 2020
Hi,
I guess the issue is with arduinoo object you are creating, which I can infer is invalid. Can you try deleting and clearing the object from the workspace/memory and re-run your code.
You can refer the following documentation links for more help.
Hope this helps!
  5 Comments
Harsha Priya Daggubati
Harsha Priya Daggubati on 20 May 2020
Edited: Harsha Priya Daggubati on 20 May 2020
Also, make sure that the port number to which arduino is connected is same as that mentioned in your script, and baud rate is the same.
Have a look at this published File Exchange submission:
Criss2112
Criss2112 on 20 May 2020
Yes, it s the same. Com6 and 115200 the baudrate.It works perfectly fine in matlab script when running

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