Like I said this is a hobby of mine so I have very little knowledge. Would a fixed pot be like i was saying? A static non adjustable "sensitivity"?
Like when you say you did a resitor or fixed potentiometer you might have to explain what it is or how it differs or i may come back with not only a lot of questions but ones you might think dont make sense or are stupid
Your PCB has a simple voltage comparator on it and the potentiometer is adjusted so no moisture gives a HIGH and moisture gives a LOW (or vice versa).
The conductivity of moisture/water differs too much to expect that a sensitivity adjustment can ever be accurate.
It responds to moisture or no moisture, nothing in between.
Probably in your situation, once you set the potentiometer it will not need to be readjusted ever again.
The problem with potentiometers is they are mechanical.
To prevent mechanical failure or accidental adjustment changes, you have the option of removing the potentiometer and replacing it with two fixed resistors. Obviously, no adjustment can be made if this is done.
Try the PCB as it is.
If it works and gives good results, place it in a moisture proof case to see if it works over the long term.
As far as coding the angle of the servo, if I want it at 45 degrees dry and 135 wet would I put those numbers in the code or is there a different way this works? Maybe the values are 1-1000 meaning 0 degrees and 1000 meaning 270 degrees(furthest the servo can go) meaning 45 degrees would need a value set at 166.5 and 135 needing a value of 499.5. Maybe that only happens if you set up a custom value range? Maybe you are required to set a range. Which i would set as 0-270 for all the available degrees and ease of coding
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