how to use boolean push button as a constant to add to other values

[KP2]

Hello all, I am trying to use a boolean OK button and a constant to make something similar to the calculator project I've read about in other posts. I labled the button $1.00, $0.25, ......  So on.  I just want to add the value to an indicator every time I push the button.

The closest I can get is the vaue is displayed while I hold the button in and the it goes to 0 as I realese it. I want it to add up each time its pressed.

Thanks in Advance

Kevin

[RavensFan]

Without seeing any of your code so that we know what you have done, I'm going to guess that you failed to use a shift register to store the value that you add to every time you press a button.

[KP2]

This is the VI that I started with. I will read on in the help info as to how to use a shift register. If you have a simple way to explain how a shift register works that would be appreciated.

Thanks for your time.

KP2 

[RavensFan]

Do you have a while loop with your code?  Right now it looks like your VI just runs once.

(Please do not say you are using the Run Continuously button.)

I would recommend looking at the online LabVIEW tutorials
LabVIEW Introduction Course - Three Hours
LabVIEW Introduction Course - Six Hours

[nitad54448]

Hi

The best way to do it is by using an Action Engine. Look for a Nugget made by Ben and describing Action Engine (it is worth every second of your time spent of that). As a matter of fact, the action you need to do is a beautiful example of an Action Engine.

regards

N

[KP2]

Yes I was using the run continous button. 😞 but in my next attemt got me closer and now I tried this next example and this works, SO FAR. I still need it to reset the shift bit like a clear button. I'm close, thanks for your help.

KP2

[KP2]

Not sure where to look for the action engine.

[Paul-D · Accepted solution]

Hi Kevin, this is Paul from Applications Enginering at NI.  Try something like in my attachment.  You can use case type statements to evaluate whether a button was pressed, then assign that true case a value.  Good luck with it

.

[nitad54448]

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@KP2 wrote:

Not sure where to look for the action engine.

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Search : Action Engine Nugget Ben

[KP2]

Thanks Paul, that works great.