How many times will scene run?

[rolandrat 1]

This might sound a bit stupid, knowing me it probably is!  Anyway if I have a simple block scene that is If LUX level < 45 turn on light.

 

I was wondering how often this scene runs, obviously when the lux level gets below 45, but does it keep triggering indefinitely while the lux level is below 45 or does it just trigger that once?

 

Soz for stupid question. 

[jires 17]

Scene will run everytime when lux level will change value. If condition wil be true (lux level < 45), it wil send command to the light to turn on (dosen't matter if light is on or off at the moment). If condition wil be false, scene will end doing nothing.

[rolandrat 1]

OK thanks for the reply, so if lux drops to 44 it sends on to light, so if it then 2 mins later drops to 42 it will send on again, yes?

That makes sense, so the correct thing to do would be to check also if the light is off also, save sending repeat commands to an already on light.

[jires 17]

Yes, and yes..

 

The correct way is to check ligt first, no unnecessary z-wave traffic

 

in block you can do:

if

lux<45

and

light == off

then

light == on

 

but in this case, you have to remove checkmark  from ligt in triggering devices, just leave only one on lux. Otherwise you will not be able to turn ligt off on the switch when lux level will be below 45. It will happen because changing of light value will activate scene also.

[Joacim 11]

Also depends how often your lux sensor reports changes, of course . Often there is a parameter to be set so that the change have to be substantial to avoid unnecessary battery drain and z wave traffic.

[rolandrat 1]

Thanks all, very much - that clears things up for me now.