Running myDAQ Operations Fast

[T.Rock]

Hello all,

I would like to write a program that frequently changes the voltage outputted by my myDAQ. I currently am using this piece of code (image). Even when in a for loop with no delay there is a delay of around 20ms. Is there anyway I can reduce this?

The delay is definitely in this section of code and not somewhere else in the loop. I know this as if I delete this section, the loop runs through all iterations (almost) immediately.

I am new to LabView and the myDAQ so please bear with me!

Many thanks in advance,

T.Rock

[paul.r · Accepted solution]

Create the task outside the loop or only on the first loop iteration, and on later iterations just write to the task.

[T.Rock]

Thanks! That significantly sped up the iterations.

T.Rock

[paul.r]

NP - make sure you are closing the task when you are done with it as well.

[T.Rock]

Thank you for the advice, I have now added a clear task VI. Although moving the setup outside the loop greatly improved speed, ideally for my application I would like the loop to be able to run even faster. Is there any possible way to do so? I have attached an image of the relevant code below.

T.Rock 

[paul.r]

What are you trying to do? What is the source of the data you are writing to the output?

[T.Rock]

The data source is Cartesian coordinates converted from a polar function whose theta value increases with each loop iteration.

My goal is to input these voltage values into a dual channel CRT vector scope fast enough so that I can effectively draw polar equations.

I have attached a screen clip of the program and also the zipped project file if you would like to take a look.

Thanks again for the help!

T.Rock

[paul.r]

 You could build up the entire array/waveform and write it to the card all at once versus writing it sample by sample.