MATLAB Answers

Serial communication with Arduino microphone signal and matlab

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Mark Chertoff
Mark Chertoff on 8 Apr 2019
Answered: Mark Sherstan on 12 Apr 2019
We are trying to use matlab to read a microphone signal from a microphone attached to an Arduino microcontroller. When we program the controller to putout specific numbers, matlab reads the data fine through the USB port. If we now send the microphone signal, matlab reads the signal but the signal is not correct. It looks like it is missing many of the voltage changes from the microphone.
Here is the code
% Find a serial port object.
obj1 = instrfind('Type', 'serial', 'Port', 'COM8', 'Tag', '')
set(obj1,'BaudRate',115200)
if isempty(obj1)
obj1 = serial('COM8');
else
fclose(obj1);
obj1 = obj1(1);
end
% Connect to instrument object, obj1.
fopen(obj1);
i = 1;
count = 0;
x = 0;
while i == 1
x = x+1;
count = count+1;
tempdata = fscanf(obj1);
data(count,1) = str2num(tempdata)
end
plot(data)
fclose(obj1)

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Answers (1)

Mark Sherstan
Mark Sherstan on 12 Apr 2019
Look at my solution for another question here: https://www.mathworks.com/matlabcentral/answers/452211-how-to-make-arduino-receive-data-sent-from-matlab#answer_367687. You my be running into bottle necks with the MATLAB/serial connection depending how fast you are sampling and how much data is being transferred. If you have further questions after trying my code please post both your MATLAB and Arduino code. Good lcuk!

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