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How do I keep acquiring a signal with startBackrgound() for a specific amount of time after a condition is met?

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melanie basnak
melanie basnak 2019-8-29
I'm acquiring a signal in the Background until a certain condition is met, specifically, until the voltage coming from one of the channels reaches a certain value. Here's the code I have so far:
s = daq.createSession('ni');
s.addDigitalChannel('Dev1', 'port0/line0', 'OutputOnly');
ai_channels_used = [1:8];
aI = s.addAnalogInputChannel('Dev1', ai_channels_used, 'Voltage');
for i=1:length(ai_channels_used)
aI(i).InputType = 'SingleEnded';
end
s.Rate = 4000;
fid = fopen('log.dat','w+');
lh = s.addlistener('DataAvailable',@(src,event)logDaqData(fid,event));
lh2 = s.addlistener('DataAvailable', @(src,event)stopF(src,event));
s.IsContinuous = true;
s.startBackground();
The logDaqData function simply logs the dta being recorded. The stoF function is the one I care about, that stops the acquisition once the voltage is reached, and it looks like this:
function stopF(src, event)
if (mode(event.Data(:,5)) > 1.25 && mode(event.Data(:,5)) < 7.5)
src.stop();
end
end
I would like to add something where once that condition is met, the signal is still acquired for an extra 1 sec, and then stops. I've tried adding
pause(1)
before the 'src.stop()' but it seems like that makes the code stop, and with it, the acquisition.
How can I solve this? Thanks!

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