MATLAB: Serial Communication App Designer

serial

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!

Best Answer

  • 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!