Advice for infinite loop with global variables

[Quikdav 15]

Hi all

I need some advices regarding a LUA script I would like to write.

I would like to monitor an air sensor using a virtual device and then select the icon depending on the quality of the air. 2 solutions :

- I use the main loop of the virtual device but the main loop is executed each 3 seconds so if I need global variables (to summarize value, first one, last one, etc), I have to create them into the panel Variables and load them each time the main loop is executed (I choose this one but not very conveniente with global variable)

- I use a scene with an infinite loop so I can declare and manage variables only in my scene abd I can change the icon of the virtual device

I don't know what is the best practice in term of performance and ressource

Thanks a lot for your advices

[Dalle1985 16]

Depends on how often you are looking for updates. If you want updates every time the air sensor changes value, you could just create a lua scene with the device as a trigger. As soon as the value changes, the scene triggers and the icon is updated accordingly. The scene then kills itself, when the value changes again, same thing. This will put very little strain on your hc if the value changes rarely, but if it changes conatantly, it might be better to have a scene run in an infinite loop with a preset delay i.e. 10 seconds.

Personally, I try to avoid using the main loop as i find that it is very ressource heavy.

[Quikdav 15]

Thanks for your feedback

I think I will use a scene with infinite loop because using trigger on variable means to use global variables from the panel variables.

There is a lack on the HC with context of global variables. It would be fine to declare global variable in a scene running by trigger without using variables from panel. We have no choice today because with the trigger, all the local variable of the scene are reset

I hope they will change this in V4.0