Detect which is the last element to change?

[Ano Ano]

Hello,

I have a set of 50 LED and I want to be able to log which one of them was the last LED to turn on. I imagine I have to place them all to an array, but I have no clue as to how to detect the last LED that turns on.

Any ideas?

Thank you in advance

[BramJ]

Maybe you can use the event structure with value change events, the event structure also gives the time when the event occured

[asbo]

Maybe you can use the event structure with value change events, the event structure also gives the time when the event occured

Expanding on this, put all of the LEDs' Value Change events in one case. Wire the CtrlRef terminal into a shift register (or FG, if it's merited) and then you'll be able to use that reference to refer to the LED last updated.

[pylb]

If you can keep a copy of what the prvious state was, you can do something like this (if you are sure there is only one change, you can just do the search and not the loop):

[Ton Plomp]

If you XOR the old and new values, all the changed booleans will be True.

Ton

[Ravi Beniwal]

If putting the LEDs in an array or a cluster an option, instead of having individual LEDs and then adding them to one event case, it would make the whole thing easier. Then you can just use the the single value change event for the array/cluster, which will give you the old and new values and then you can

If you XOR the old and new values, all the changed booleans will be True.