Using write function of Data Acquisition Toolbox won't generate a continuous wave.
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Hello everyone, I'm trying to build a GUI in matlab that enables me to read a signal from an input channel of my DAQ device (Rogadaq2) which I managed to do already. Additionally, I'm trying to write a desired sin wave to the output channel using the "write" function, however, the signal written is not really continuous. This is a big problem, especially because I need to compute the FFT of this signal. The figure with the signal should corresponde to a a sine wave with Amplitude = 1 and Frequency = 10Hz. I am quite new to this toolbox and haven't found usefull information in the package's documentation. I would appreciate if anyone knows what is causing this and how I can make it a perfect continuous sine wave. Thanks in advance!
function GeneratingStartButtonPushed(app, event)
% Disable DAQ device, channel properties, and start acquisition UI components
setAppViewState(app, 'Outputacquisition');
t = linspace(0,1,app.DAQoutput.Rate);
frequency = app.GeneratingSignalFrequency.Value;
Amplitude = app.GeneratingSignalAmplitude.Value;
output = Amplitude*sin(2*pi*frequency*t);
try
%Create and start DAQouput object
start(app.DAQoutput,"RepeatOutput")
% write(app.DAQoutput, [output' ; ones(1*size(output))']);
write(app.DAQoutput, [ones(1*size(output))' ; output']);
catch exception
% In case of error show it and revert the change
uialert(app.LiveDataAcquisitionUIFigure, exception.message, 'Start error');
setAppViewState(app, 'OutputConfiguration');
end
% Clear Log status text
app.LogStatusText.Text = '';app.AcquiringStartButton
plot(app.LiveAxes_2, t, output);
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1351079/image.png)
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Mario Malic
2023-4-21
I have posted my app here, unfortunately it is not yet applicable for the output, but it shouldn't be an issue to add that functionality. https://uk.mathworks.com/matlabcentral/fileexchange/128118-daqx
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Vanshika Vaishnav
2023-4-13
Preloading the function solves the problem.
Also check Rate property of https://uk.mathworks.com/help/daq/daq.interfaces.dataacquisition.html object, as the Rate is set to be minimum when the object is initialised.
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