Hi guys,
does anyone have some information or experience with long-time maximum humidity for operating Arduino? I've got Arduino in heat isolated box and I have worries about humidity and condensation during winter.
I'll put there a small ventilation, but I have to save power, so I'm not able to have the vent swith on all the time.
Thank you for your advices!
This photo has 2 ESP32's one which has been operating for the last 2.5 years, outside.
The electronics for reading the environmentals are located in the Stevenson screen - Wikipedia are exposed to the weather but protected from getting wet by the shield.
Check the data sheet, it probably states non condensing. As long as it stays dry it will be OK. Any moisture will pick up contamination over time and be conductive. If it evaporates it will deposit whatever it picked up and the next time it will be absorbed by the moisture and eventually become a conductor shorting things out.
Moisture condensation on a powered PCB will destroy it in short order, due to electrolysis. To prevent that, manufacturers coat the entire PCB and parts with "conformal coating", basically nail polish. Or encase the entire PCB in potting compound.
Another alternative is to heat the enclosure, when required to prevent condensation.
Silicone grease or spray lubricant will repel moisture and is non conductive
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