Filtering in real time from a NI DAQ
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Marco Tito Scordo
am 18 Jan. 2017
Kommentiert: Walter Roberson
am 7 Feb. 2017
Hello Guys, I'm trying to acquire an analog signal (coming from a sensor) from a NI DAQ board and I would like to manage better the plot and filtering in real time in Matlab. I'm acquiring in background operation. What is hard is how to have access to the data (from the listener) for processsing: I'm able to plot only one second of data. Does someone knows how to solve this? Thank you
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Vandana Ravichandran
am 20 Jan. 2017
Bearbeitet: Vandana Ravichandran
am 20 Jan. 2017
Please try the "DurationInSeconds" property of the session object. You can create a listener using "addlistener" function that calls the "plot" Callback for the "DataAvailable" event. "DurationInSeconds" can be used to control for how long the background operation runs and the data is acquired for this duration. Once this interval completes, the listener invokes the "plot" callback.
The documentation has an example similar to what you want to implement: https://www.mathworks.com/help/daq/ref/dataavailable.html
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Walter Roberson
am 7 Feb. 2017
How are you doing the plotting?
The callback on the listener should have access to all of the data made available. However if you happened to be plotting in Simulink with a Scope block then that block might be configured to retain a limited number of points.
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