Unsuccessfull read: MatLab-Arduino Bluetooth Communication via HC-05 device

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Graziano Messineo
Graziano Messineo 2019-12-14
回答： Urmila Rajpurohith 2021-5-4
I'm trying to understand why my code returns the message "Warning: Unsuccessful read: A timeout occurred before the Terminator was reached.'Bluetooth' unable to read all requested data." when i set a baud rate different from 9600 in the Arduino Sketch, for my bluetooth istance.
My code below
bt=Bluetooth('HC05',1);
fopen(bt);
stop_rec=0;
h=animatedline('Marker','o');
data=[];
i=1;
while(stop_rec==0)
tic;
a=fscanf(bt,'%s');
ind=find(a==';');
data(i,:)=[str2double(a(1:ind-1)),str2double(a(ind+1:end))];
addpoints(h,i,data(i,1));
drawnow
i=i+1;
flushinput(bt)
flushoutput(bt)
if(i>500)
stop_rec=1;
end
toc;
end
fclose(bt);

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回答（1 个）

Urmila Rajpurohith
Hi
The initialization process on the Arduino board takes a few seconds. "fopen" does not wait until the initialization process finishes.Adding a pause between "fopen" and the following commands may resolve the issue.The input of "pause()" depends on the hardware. Usually, a few seconds would be long enough.
Hope this helps!

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