I think the title captures it, but to expand upon this further. What are some of the best practices that you use to place electronics outdoors? Include what you do for the cases and mention issues with temperature, moisture, lightning, shock hazards, UV Damage and if your device generates heat how do you deal with it, how do you get power to it etc.
Answer
Moisture ingress protection:
Unless you are willing to completely encapsulate your circuitry in epoxy or similar, you will have to deal with water ingress into your electronics cabinetry. In general there is no guaranteed totally sealed box, if you have water vapour, temperature cycles and a sealed container it is a certainty that water will find it's way in.
On of the best ways of dealing with this is to put an explicit pressure equalization port in your case. In the early days we would use a fine brass or stainless mesh, that would prevent most moisture from entering. Now a days there are special membranes derived from outdoor jackets (brand name omitted here) that work very well as they prevent moisture ingress, allow for moisture egress and allow air pressure to equalize.
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