Acquisition with Analog Discovery 2

Question

Christophe Combaud 2018-11-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430799-acquisition-with-analog-discovery-2

评论： Brian Hu 2018-11-28

Hi,

In order to acquire analog data, I use the Analog Discovery 2 from Digilent. I used the "Data Acquisition Toolbox" and the "Digilent Analog Discovery Support from MATLAB" package.

I achieve to get data in a tab and want to automatically launch the acquisition when the power is high enough. Maybe using a trigger ?

I also can't use the App, my device doesn't appear and the "Refresh" button doesn't change anything.

If someone already used this device can help me !

Thanks

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

Brian Hu 2018-11-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430799-acquisition-with-analog-discovery-2#answer_349033

Hi Christophe,

There are a few workflows that you may be interested in looking into. First, make sure that you can detect the Analog Discovery 2 on a separate Digilent software to make sure that your issue is not due to hardware connection. Please also make sure that you have the correct support package for Digilent Analog Discovery Hardware downloaded. I have included the support package in the link below.

https://www.mathworks.com/matlabcentral/fileexchange/40344-data-acquisition-toolbox-support-package-for-digilent-analog-discovery-hardware

After verifying this, you will want to successfully connect to the Analog Discovery 2 device through MATLAB then transmit and receive data. The examples below might be useful for you to get started.

https://www.mathworks.com/help/daq/examples/getting-started-acquiring-data-with-digilent-analog-discovery.html

https://www.mathworks.com/help/daq/examples/getting-started-generating-data-with-digilent-analog-discovery.html

https://www.mathworks.com/help/daq/examples/acquiring-and-generating-data-at-the-same-time-with-digilent-analog-discovery.html

Lastly, if you are interested in launching acquisition when a certain variable reaches a threshold or triggers, you may want to consider using MATLAB callbacks to accomplish this. An alternative would be to have a control for loop within the code that triggers when the power read from the device exceeds your intended threshold. If you are interested in using callback functions, here are a few links that may be helpful.

https://www.mathworks.com/help/matlab/creating_plots/callback-definition.html

https://www.mathworks.com/help/daq/examples/software-analog-triggered-data-capture.html

4 个评论
显示 2更早的评论隐藏 2更早的评论

Christophe Combaud 2018-11-27

在 MATLAB Online 中打开

Hi Brian,

Thank you for your answer.

The Support Package is included and it works. But the device still not appears in the "Analog Input Recorder" App.

I achieve to receive data and to save it. For my project I have an signal emitted every 15s which last 1s, see picture below. Currently, to record it I have to set a 20s acquisition and to select manually the data containing the message.

I saw the two links of your message and the "Software-Analog Triggered Data Capture" is interesting. But I have a few problems :

ch1.TerminalConfig = 'SingleEnded';
>>> For this type of channel, the 'TerminalConfig' property is not settable. It has a value
of 'Differential'.

As I can't configure it, it is necessarily 'Differential'.

s.IsContinuous = true;
>>> You cannot use the "IsContinuous" property with Digilent hardware.

It mains that I can't let the device run automatically ?

startBackground(s);
>>> Method 'startBackground' is not supported on objects of class 'daq.di.Session'

I think I can't acquire and do operations in the mean time.

Christophe Combaud 2018-11-28

I think that the function 'inputSingleScan(s)' may be a solution but how can we launch it when we have the first emission ? Because if we launch it when there is no emission, we will miss others.

Brian Hu 2018-11-28

Please refer to the following documentations for the current hardware limitations with Analog Discovery devices.

https://www.mathworks.com/help/daq/digilent-analog-discovery.html

If you want to use a digital trigger, this example might be helpful for you to get started.

https://www.mathworks.com/help/daq/acquire-voltage-data-using-a-digital-trigger.html

Otherwise, you can also try rapidly triggering inputSingleScan until the first signal is read, then follow with startForeground in order to capture data. Like you mentioned previously, there is currently no functionality for startBackground with the device you are using.

请先登录，再进行评论。

Acquisition with Analog Discovery 2

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

4 个评论
显示 2更早的评论隐藏 2更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

Acquisition with Analog Discovery 2

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

4 个评论 显示 2更早的评论隐藏 2更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

4 个评论
显示 2更早的评论隐藏 2更早的评论