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MSFS how to manage code for power ON and OFF a LED with condition?

Hi all,
I've done a works code for power ON a Led into the cockpit as soon as I switch ON the the Circuit n.20
Follow the code

<UseTemplate Name="ASOBO_GT_Material_Emissive_Code">



My question is.. now If I want to power off this LED using another condition for example turning ON the Engine, how do I have to change this code? Or do I have to do it in another way?


The light will only be on when the circuit is on AND (&amp ; ) the engine is not (!) on.
Hi Anthony31
So I have to think that :
&amp = and
! = Not ?
Does it means your sentence?


&& is "and"
! is "not true"
|| is "or"
!= is "not equal"

I write && as &amp ; though because in XML && might not work (it didn't work in FSX so I have kept the habit)

In the same way that the > symbol should be written as &gt; because > in XML is a special character.

Thank you very much for explanation.
Sure it will be useful for me for other xml instructions. Doing my project I’m learning also.