Event structure:Button-Value change

[Meenatchi]

Hi,

I am using LabVIEW 8.0. If i click the button,the value changes from false to true and the event executes.If i press the button twice or thrice then the event executes two or three times.How to control this? even if i press the button unknowingly for twice or thrice it has to execute only one time..how to do this??

Regards

Meenatchi

[TCPlomp]

You should use dynamic events if you want such behaviour.
See this article for some introduction.

Ton

[Pnt]

Or use a shift register, compined with a timeout case.

Shift register will increase in every timeout case and write to zero at value change.

Ignore value change, if sfift register has a small value (<3, and a timeout of 100ms, will give you 300msec debounce)

[YogeshShivarudrappa]

Hi,

If u want that kind of behaviour, user shift registers or you can use the dynamic event case.

Hope i have understood the problem and have provided the sollution.

Enjoy LabView,

Yogesh

[rpursley8]

You should use a shift register to save the time that the event executed.  In the event you should compare the new time to the old time in the shift register.

case statement TRUE

If the new time is large enough (lets say 1000 ms more than the old time) then you should perform your action that the button push represents, and save the new time to the shift register.

case statement FALSE

If the new time is  not large enough (less than 1000 ms after the old time) then do nothing.



Your program is still responding the the event, but just not doing anything some of the time.

[Meenatchi]

can u send me sample code to do this??

[rpursley8]

Here it is in LV7.1