How to acquire data through Analog Input and use in a Digital Output with NI myDAQ?

Question

Danté Davids 2017-9-5

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https://ww2.mathworks.cn/matlabcentral/answers/355225-how-to-acquire-data-through-analog-input-and-use-in-a-digital-output-with-ni-mydaq

回答： Amit Doshi 2017-9-7

I'm using a DAQ to acquire data through an Analog Port (AI:0) and need to use it to control 2 Digital Ports (D0:4;5 & D0:6;7). Using inputsingleScan I can only acquire 1 single scan from the Analog Input. I need to constantly update this scan in order to control the Digital Output. startForeground and startBackground seem to only work with Analog inputs and outputs.

I am taking data from a Photo-transistor and using it to change the direction of 2 motors.

So my question is, how can I continuously take scans using the Analog input to update the operations on the Digital Output?

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Answer 1

Amit Doshi 2017-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/355225-how-to-acquire-data-through-analog-input-and-use-in-a-digital-output-with-ni-mydaq#answer_280691

Hello Danté,

You could use 'addlistener' to add a listener function to the session. This function is called every time the DataAvailable event occurs. Refer the below link :

http://www.mathworks.com/help/daq/examples/acquire-continuous-and-background-data-using-ni-devices.html

Inside that function, you can loop through the acquired data and use the 'outputSingleScan' function to output the data to a digital channel. Refer the below link:

https://www.mathworks.com/help/daq/ref/outputsinglescan.html?s_tid=doc_ta