I have made a few versions of a sensor that is mounted outside to measure sunlight.
It has an atmel processor inside talking over cat5 wire to another atmel processor inside the building.
The board outside is conformal coated (except for the sensor itself) we used glass so it would not discolor over time.
The early versions had trouble with leaks, so we kept making better seals. At this point it does not leak, but it does suffer from condensation if it was cold and damp then changes to sunny.
so the question is - do I put a hole in the bottom of the box to let the parts breathe?
thanks in advance