Error sending data from Arduino to Matlab

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Wen Shu Wong 2020-2-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/506062-error-sending-data-from-arduino-to-matlab

I am trying to send temperature sensor data from arduino to matlab using serial communication. The temperature data are displayed on the Arduino serial monitor but I couldn't get the data in Matlab. The following error occurs. I've tried every possible ways to get the data by putting a pause(3) before fscanf but it still doesn't work.

Warning: Unsuccessful read: A timeout occurred before the Terminator was reached. 'serial' unable to read any data. For more information on possible reasons, see Serial Read Warnings. NaN

if ~isempty(instrfind)
    fclose(instrfind);
    delete (instrfind);
end
waitTime = 10;
s = serial('COM4','BAUD',9600);
waitTime = duration(0,waitTime,0);
t = datetime('now') - startTime;
while t < waitTime
    fopen(s);
    pause(3);
    idn = fscanf(s);
    fclose(s);
    serialData = str2double(idn);
    corrData = serialData;
    disp(corrData);
end
clear a;
clear s;