Blink LEDs in a DAQ

[Mathew999]

Hey guys,

so what I was thinking to do is to make a case structure and put the sub vi for the DAQ inside.

And outside the case structure keep inputting true and false at a frequency so DAQ goes on and off.

is there any element in labview that gives true and false together and automatically changes its value?

Thanks

Mathew

[BillMe]

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@Mathew999 wrote:

Hey guys,

so what I was thinking to do is to make a case structure and put the sub vi for the DAQ inside.

And outside the case structure keep inputting true and false at a frequency so DAQ goes on and off.

is there any element in labview that gives true and false together and automatically changes its value?

Thanks

Mathew

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What do you mean "so DAQ goes on and off"? Do you mean you want to write a 50% duty cycle binary signal to a DAQ card? If so, you don't need the case statement, Just toggle the boolean each iteration of a for/while loop. And there are better ways such as setting up the timing for the DAQ and writing a waveform (digital waveform, 1 channel N samples), otherwise you will get jitter in the output signal.

Can you specify more details on what you are trying to accomplish?

[Mathew999]

In my DAQ I have 8 LEDs, I want to blink those LEDs. i can oyay make it light now, so I was thinking of toggling on and off the chase structure which contains the DAQ sub VI to light the LED. Is it clear now?

[BillMe]

Toggling the case structure doesn't make sense. You want to toggle the signal that's going into the DAQ Write. For that you would use a For loop or While loop. Since you have 8 LEDs, you will want an array of 8 booleans. Something like this:

You will need to define the task/channels and wire up error handling.

[Mathew999]

so where do i connect my DAQ assistant? I am using DAQ Assistant to light my LED in the DAQ. Or is it like if using DAQ write , no need to use DAQ Assitant?

[BillMe]

Yes, you would substitute the DAQ Write with your DAQ Assistant, making sure to choose the same parameters.