Increment once on boolean change

[eddiemerckx]

Hi guys,

I'm designing a robot which turns on a base. To determine the position it's in, I use a button (NI-DAQ) which is pressed every few second.

Now I want to count the amount of button presses.

I have the a DAQ-module (which reads the inputs) running in a while loop. When I increment a counter using a case-structure when the button is pressed, my increment is repeated every clockpulse.

I tried using an Event structure to execute when the boolean changes its value but that didn't work.

Using a second boolean as control to stop the incrementation didn't work well either.

Any ideas on how to do this?

[Ryan Podsim]

Sounds to me like you need to implement a SR(shift-register) in your while loop to hold the last value of the Boolean in question and do a comparison between the boolean in question it's previous value.

Example

[eddiemerckx]

Sounds to me like you need to implement a SR(shift-register) in your while loop to hold the last value of the Boolean in question and do a comparison between the boolean in question it's previous value.

Example

Thank you Ryan, while loading this topic, I came up the a similar solution involving a shift register and a control boolean. This seems to work.