topic Press and delay button with case structure in LabVIEW

Press and delay button with case structure

sarwatsarfaraz — Fri, 26 Aug 2022 07:49:25 GMT

In the program attached below, the arm/disarm led will turn on when I press button 2 and will turn off when i press button 3.

This is a prototype program for arming/disarming a vehicle.

I want to modify the program such that when i press button 2/3 for 2 seconds, only then they perform the desired function. if i press for less than 2 seconds, nothing happens.

How can I do that?

Re: Press and delay button with case structure

GerdW — Fri, 26 Aug 2022 08:24:28 GMT

Hi sarwat,

@sarwatsarfaraz wrote:

In the program attached below,

There is no program, just two images showing parts of your code…

@sarwatsarfaraz wrote:

I want to modify the program such that when i press button 2/3 for 2 seconds, only then they perform the desired function. if i press for less than 2 seconds, nothing happens.

How can I do that?

I recommend to use the event structure in favor of that InputDevice functions.

Then you need to store the timestamp of the "button press" event in a shift register. You can use the timeout event to check for your "minimum 2s delay" and you can also monitor any "button release" events…

Rif.: Press and delay button with case structure

andcadev — Fri, 26 Aug 2022 08:51:32 GMT

You should "filter" your button signal. On the rising edge, you should register the switch time. Then, you continuosly check Tnow - Tswitch.

Have a look to the attached code.

Re: Press and delay button with case structure

altenbach — Fri, 26 Aug 2022 15:21:37 GMT

As a first step, you need to define the problem fully. For example what should happen if both buttons are pressed for 2 seconds?

Re: Press and delay button with case structure

altenbach — Fri, 26 Aug 2022 15:49:55 GMT

Since you seem to prefer pictures over actual VIs, here's one simple possibility to turn on an LED after the button 2 has been pressed for 2 seconds. No need for local variables and case structures.

You can easily expand it for more buttons and the desired behavior for each once you exactly define the problem.