MobiFlight Community Support

Hi!

Need a bit of help.

I have really tried to get an understanding of how to transform a value so that a servo displaying trim settings work. The servo is correctly setup and has a range of MIN-MAX 0-100.

Now I set it up to read a sim variable via preset ELEVATOR TRIM INDICATOR I get the preset code:

Code:

(A:ELEVATOR TRIM INDICATOR, Position)

If I read the MSFS docs it is saying:
Position: (-16K to 0), -16K = full down

But what I get is a decimal value of about -0.46 to 1. Why is that, should I not get an int value?
I have really tried to find one simple example of how the full RPN script of the preset code + transformation should look like but I fail to find one. Most all example are of setting variables, not reading them. I have tried numerous variants but I fail completly to find any example of how to fix this. I'm sure this is a pretty basic thing though so a bit frustrating to not be able to solve it... I have done transformations and stuff on setting variables, but the syntax here is different.

Also, if there is a better preset and servo configuration than I have done, please advise of alternative configs.

Ok, I figured out something.

I now have:

Code:

 (A:ELEVATOR TRIM INDICATOR, Position)  16383 *

And that gives me a range (in the Cessna 172) of -7606.396 to 16383. I don't understand that range. Why is there -7606?
Is there some other TRIM variables to use that gives usable output?

Ok, I got it working.

Used ELEVATOR TRIM PCT instead, not sure it gave me different numbers than that above, but anyways:

Code:

(A:ELEVATOR TRIM PCT,Percent Over 100) 100 * 100 +  near

Gives me a range of 0 - 200 and set the servo to 0-200 too. Still don't know why I get a decimal number here from MobiFlight that I have to tweak into something useful...

It is normal for elevator trim to have negative and positive side, 0 being the neutral position.
You were using percent over 100 as units, so that returns a value between -1.0 and +1.0 with decimals.
I think most of the Mobiflight support has moved to the Discord community server.