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In my previous question the problem was related to EM noises with the Arduino boards, then I asked myself: How strong are the Arduino boards relating to interference robustness?

For example, if I physically put my Arduino boards in a waterproof package and in the pouring rain, will those Arduino boards have some EM noises? Can I use Arduino boards in that environmental condition (outdoor, pouring rain, etc) and make those to still work reliably?

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    \$\begingroup\$ Suggestion: This question isn't specifically about Arduino boards... The question is more generic to electronic circuit boards, perhaps boards with microcontrollers. You might want to edit your question to only mention the Arduino as a point in example, rather than the crux of the question. \$\endgroup\$ – Anindo Ghosh Apr 24 '13 at 8:28
  • \$\begingroup\$ @Anindo Ghosh - The question is intentionally / exactly related to the usage of Arduino boards and it is not closed for "more generic to electronic circuit boards, perhaps boards with microcontrollers" answers. Arduino matters are the crux of the question. \$\endgroup\$ – user502052 Apr 24 '13 at 8:36
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    \$\begingroup\$ I don't think the question is that bad, although it should be clearer that it's asking about EM immunity rather than some other kind of strength. \$\endgroup\$ – pjc50 Apr 24 '13 at 8:58
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    \$\begingroup\$ I reopened it, though I think there's still room for improvement. I also think that rain (if it's waterproof sealed) doesn't create interference, maybe just troubles in case of wireless communication. \$\endgroup\$ – clabacchio Apr 24 '13 at 10:04
  • \$\begingroup\$ @clabacchio - BTW For me, comments (like those that was present for this question) should be deleted, but not at all: at least, those comments, should be still available... \$\endgroup\$ – user502052 Apr 24 '13 at 10:08
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Unless I am misunderstanding the OP, then answer is a "no", unless it is raining energized transformers. Rain (the kind made of water droplets) does not generate EM.

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    \$\begingroup\$ +1 for an appropriate answer :-) Oh, you forgot about radioactive rain. \$\endgroup\$ – Anindo Ghosh Apr 24 '13 at 10:17
  • \$\begingroup\$ So, the EM generated by the rain (the kind, so abundant, that completely surrounds the waterproof package that contains the Arduino boards making it to be effectively underwater) is so weak that it insignificantly influences the Arduino hardware? \$\endgroup\$ – user502052 Apr 24 '13 at 10:43
  • \$\begingroup\$ Unless there's some physical phenomenon I'm not aware of, rainwater can affect propagation of EM waves (especially microwaves), but generate EM radiation? Seriously? \$\endgroup\$ – Thorn Apr 24 '13 at 11:02
  • \$\begingroup\$ emcuk.co.uk/awareness/Pages/InterferenceExamples/… - apparently it can tribocharge. Obviously it also conducts away charge, so this is only an issue for aircraft. \$\endgroup\$ – pjc50 Apr 24 '13 at 12:07
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    \$\begingroup\$ @user502052 and we are trying to say, water, the kind that falls from the sky in normal conditions and you can drink, does not cause any Electromagnetic interference. Do you have a link to where someone told you otherwise? \$\endgroup\$ – Kortuk Apr 24 '13 at 21:19

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