Filtering in real time from a NI DAQ

Question

Marco Tito Scordo 2017-1-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/320885-filtering-in-real-time-from-a-ni-daq

评论： Walter Roberson 2017-2-7

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Vandana Ravichandran 2017-1-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/320885-filtering-in-real-time-from-a-ni-daq#answer_251354

编辑：Vandana Ravichandran 2017-1-20

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

2 个评论
显示无隐藏无

Marco Tito Scordo 2017-2-7

Hello Vandana Ravichandran, thank you for your asnwer. At my knowledge, Duration in Seconds is used for managing duration of the acquisition only. So if I want to acquire 1min of signal it will have a value of 60, but the plot will show always 1 sec of aquisition 60 times. If I want to see 5 sec of signal in real time the problem is not solved and I don't have access to data anyway. Do you think is possibile another way to do it? Thank you

Walter Roberson 2017-2-7

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.

请先登录，再进行评论。