daq assistant as a case selector

[Nilvo]

Hello,

I'm trying to read a digital input from my daq assistant, and then to hold it for a x number of seconds, until the time is elapsed. The input of the assistant should not matter after the first input.

So i used a case selector and started trying with a virtual switch. All worked fine... until i'd start trying with the daq assistant. The output from a daq assistant is a 1 d array of boolean. The input for the case selector is a boolean.

Is it possible to select the case depending on the output of the daq assistant? If true, how can i do this?

Greetz Nilvo

[aeastet]

Are you only reading one DAQ input channel? Are you using a state machine?

[Nilvo]

Yes it's only one chanel to read.

What do you mean by state machine?

I'm using the NI USB-6008

Gr

[aeastet]

Do you have any code written?

[Nilvo]

Yes, in the attachment you can find my code.

If you replace the local var by a switch, the program works fine.

Gr

[Nilvo]

By the local var I mean the var "Capacitief Input" next to case selector

offtopic, how do you edit a post?

[RavensFan]

Your local variable is for a 1-D array of booleans.  You can't wire that up to a case selector since it needs a single boolean.  You would need to use Index Array to get the value of a particular boolean out of that array.

You can edit a post by going to the options menu to the upper right of your post.  But you have a time limit of 10 minutes after you first post it to be able to edit it and repost the edited message.

[aeastet · Accepted solution]

I added an index array to your code that changes the array to a single number. Keep in mind that this give you only the first digital input. If you change to a different channel you will have to index that array to a different number.

Second the elapsed time is not a very good way to measure time so I changes the way the vi was measuring time.

Third the oustside while loop is not necessary. The two loops will run until you push the stop button. I would think about using an event to capture the stop function so that you only need one stop button.

[aeastet]

OK here is the second version with the event structure.

[aeastet]

Don't forget to make the hold time 6 seconds on the front panel.