Monitor 1D Boolean 8Bit array for Changes

[4BoysDad]

HI;

In the attached VI, I'd like to continuously monitor the the 8 switches (1D 8-bit Boolean array) for any changes in value and which switch changes.

I'd also like to clear the switches on Stop.

Any suggestions?

Thank you.

4BoysDad

[altenbach · Accepted solution]

try this, for example.

[ivymerci]

Could you please explain how to create that VI invoke node?

And why you choose invoke node instead of property node?

Thank you

[altenbach]

• Place an invoke node from the palette, right-click the top and select class :VI server...VI..VI.
• Click the method and select defautl value...initialze to default

This will do it for all controls and indicators on the front panel in one step. Seems easier. :D. 

[altenbach]

Of course you can further simplify your code dramatically if you would use an array of switches on the front panel instead of 8 seperate switches. Make the array size 8, all false, and make this the default. 

[ivymerci]

Thank you altenbach. Have a nice holiday!

[4BoysDad]

Thank you for the suggestions.

How might one capture which of the switches changed value and the associated value? I think I could use a switch that holfd its True (selected) value only so long as the switch is held. I would need this switch type to get back to the feault state automatically. What do you think?

4BoysDad

[altenbach]

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@4BoysDad wrote:

How might one capture which of the switches changed value and the associated value?

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I don't understand what you mean by the rest of your comment, but to find the changed boolean, simply do a "not equal" comparison in "compare elements" mode and search for TRUE. If the result is not negative, use "index array" to find the new value.

Here is a simple example.

[4BoysDad]

Thank you.

What if I had a refnum to the 1D 8 bit boolean array? 

I assume I would use a similar technique if not the same technique.

4BoysDad

[altenbach]

Yes.

(You can always have a refnum, but why would you use one at all here?)