Acquire Continuous and Background Data Using NI Devices

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Vitali Walter 2017-8-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/352594-acquire-continuous-and-background-data-using-ni-devices

评论： Shashank 2017-8-16

 s = daq.createSession('ni');
 addAnalogInputChannel(s,'myDAQ1', 0, 'Voltage'); %%OUT2, X-Achse
 addAnalogInputChannel(s,'myDAQ1', 1, 'Voltage'); %%OUT1, Y-Achse
 s.Rate = 100000
 s.DurationInSeconds = 0.001
 while 1
   [data, time] = s.startForeground;
    plot(data(:,1)-2.5,data(:,2)-2.5,'*')
    axis([-2.5 2.5 -2.5 2.5])
end

Hello. I´m working on a project with an melexis hallsensorjoistick and an NI myDAQ device. I wants to a quire the valtage and give it back as a dot on a white screen. The code which you see above worked out. But I´ve tryed it befor with Continuous and Background Data and it didnt worked out. I wrote also a code to get data of the 2 outputs with continuous and Background Data, but can´t figure it out how to combine them.

 clear all
 close all 
 clc
 s = daq.createSession('ni');
 addAnalogInputChannel(s,'myDAQ1', 0, 'Voltage');
 addAnalogInputChannel(s,'myDAQ1', 1, 'Voltage');
 s.Rate = 10000;
 s.IsContinuous = true;
 lh = addlistener(s,'DataAvailable', @(src,event) plot(event.TimeStamps, event.Data));
 s.startBackground();
 [data, time] = startForeground(s);
 plot(data(:,1)-2.5,data(:,2)-2.5,'*')
    axis([-2.5 2.5 -2.5 2.5])

My goal is now to create an GUI with only 2 buttons, start and stop. If I try to combine the codes in one script, I get error messeges like "Error using qwert (line 19) This command can not be used while the Session is running." How can I make this working? Thx