Actually, my other caches contain all electronic waypoints in waterproof containers, but they often fail. Someone forgets to tightly close the cap or the plastic wears off, leaving the electronics exposed. I noticed that the electronics have never failed for that reason (they do fail for a lot of other reasons ;) ) but not because of humidity.
I always use plastic spray on my finished pcbs, including the batteries. The other components I use now (like Oled displays) will sustain bad weather for a long time. Again, these things are not meant to last for years, I'm glad they last one year. As a final test, I hold my finished projects under the water tap and check if they make it. Until now, they always do.
That said, this is the new challenge. I no longer use magnetic switches, so visitors won't need a magnet to activate the snail (well.. the display). I use a tilt switch, so turning them over will start the show. After it has shown its info, the chip will fall asleep and only activate when there's movement. So it doesn't matter how you place it back. I would prefer face down but I know better than that. Also, these things cannot be secured by a lock or a small chain, so they can be easily ripped. We'll see about that, I plan on making a few extra and I never had things ripped before.
This is my prototype for now:
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