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MATLAB App Designer: Error while evaluating TimerFcn for timer 'timer-5' Undefined function 'write' for input arguments of type 'string'.

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Hi, i am trying to use a timer to send data through serial port to arduino at a fixed rate. However, the error is like this: Error while evaluating TimerFcn for timer 'timer-5' Undefined function 'write' for input arguments of type 'string'.
This is the code related to the timer:
function startupFcn(app)
app.mytimer = timer('Period',0.2,'ExecutionMode','fixedRate');
app.mytimer.TimerFcn = @app.TimerCallback; % Your Timer Callback
end
This is the timer call back function:
function timertt = TimerCallback(app, ~, ~)
% Timer callback
app.sendData(app.motor_qc);
end
function sendData(app,tosend)
tosend = string(tosend);
write(app.arduino,tosend,"string");
end
I'm sure "write" for "string" can work ouside the timer. I used a button to trigger the sendData function, and it works well. But if it is inside the timer, it doesn't work. Is there any solution for this?

Risposta accettata

Shreyansh Mehra
Shreyansh Mehra il 23 Set 2022
Hello,
Please refer to the following post, which presents solutions that are possibly relevant to this error message:

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