Gradually turn on lights.

[Ian]

@cw-kid

The first expression produces an array that includes all battery powered entities across all controllers.

The second restricts the results to a specific controller.

[cw-kid]

Ian thank you. I thought it would be the battery_power capability, but I didn't know how to write that in an expression. I will try it now.

[cw-kid]

I think this may work then, I just need to edit my existing rule:

matchEntities ({controller: 'vera', capability: ['battery_power']})

EDITED rule:

[Crille]

@cw-kid You could also do all that in one expression if you prefer and are not using the other ones for anything else.

join( 
  each id in matchEntities( { controller: 'vera', capability: 'battery_power' } ): do
    device=getEntity( id ), 
    device.attributes.battery_power.level > 0.1 ? null : device.name + " at " + device.attributes.battery_power.level * 100 + " percent"
  done, ", " )

[cw-kid]

@crille

Great thank you, I will consider that.

[toggledbits]

Just a point here: why limit matchEntities() to one controller? Would you not perhaps want an alert for a device on any controller that has a low battery level?

Also, don't forget about the format() function, which is meant for things like this...

    device.attributes.battery_power.level > 0.1 ? null : format( "{} at {:.1%}", device.name, device.attributes.battery_power.level )

Oh, and in my home, any battery-operated device would be long dead if it was reporting 10% (0.1). Most of mine seem to start to malfunction below 50%.

[Crille]

@toggledbits I'm trying to understand the pros and cons of using this vs the new DynamicGroupController, could you give a short summation?

[wmarcolin]

Hi @crille !

In this post we are having this discussion about Dynamic, I am having a hard time getting it to work, but it will be very good, the concept is great and this will make it much easier.

https://smarthome.community/topic/793/multidimensional-array/17?_=1638031443562&loggedin=true

[Crille]

@wmarcolin Yes, but the goal seems to be the same so what's the pros of doing it in the DynamicGroupController? More efficient, more dynamic, less complex etc, than a global expression like the one above?
I'm all up for new improved ways of doing things just need an explanation of why

[wmarcolin]

@crille

In my opinion, everything you put in: more efficient, more dynamic, less complex. Below is a screenshot of how I do it today, and it would be replaced only by the format expression already directly inside a message as per telegram.

I will also use it to easily know all the devices that will be tripped in the house, see the other post for what I am adding after the battery. Besides this, unifying devices that for example are triggered by a contact or movement and have different expressions, will help unify and set up the alarm trigger management.