i dont know if i am at the right place to ask this, but i just cannot find anyting in the internet: i am trying to find a sealed thumb joystick similar to this one: Thumb Joystick - COM-09032 - SparkFun Electronics but with at least a littlebit resistance against dust and water.
does anyone have an idea what to use or where to find one?
One gets what one pays for is a commonly used expression.
I once needed an op- amp in the engine bay of the car. The circuit sat on a protoboard and wrapping a plastic bag around it, cealed by a rubber band, it managed a few years before i removed the fuel measuring subsystem.
In Your case the moving of the joystick adds some more difficulty, but not too much I think. Changing a cheap plastic bag now and then might be thinkable? Watch out for sharp corners or edges.