On/off daq program

Hello,
I am trying to build a program that will do input and output through a daq. I am reading data from three sensors and sending out voltage to three pistons. I would like to create a program in which I can have the program run and be able to turn the pistons on and off without stopping the program. I already have a setup that works for reading the data pretty well, I just can't figure out how to make an on/off and have the program continue to run. Any help would be appreciated. I tried using a waveform generator with different square wave duty cycles, but that doesn't work well. Thanks in advance!
-stefenmcloven

I don't know how much my vi will help, there's not much there, but I'll go ahead and attach it. I understand the case structure, but I don't know where to put it or what function I would use to change the voltage. Thanks for your help!
-stefenmcloven
Attachments:
Hs sensor static.vi ‏74 KB

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