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I am intended to use Arduino to measure Temperature and Humidity (DTH11) and Gases Grove Sensor (Multichannel). Due to weather conditions in UK, I would to get your advice how to shield all of them in water proof box? Do you believe that using Polystyrene is useful? Any recommended power source?

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    As this stands it is pretty opinion based and possibly broad. Aside, I wouldn't go with styrene stuff. Trying looking for weather station sensor enclosures(DIY route if need be) – RSM Jun 28 '16 at 16:57
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    The phrase you are looking for is "louvre box" – Majenko Jun 28 '16 at 18:03
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I'd say, use a IP-54 protection plastic case. The IP is a standard, that tells you, how big particles can(not) come into the case.

About powering, depends, how often can you go and switch batteries. If you can, you can plug the cable in the case - drill the hole through and use watertight silicone plug to ensure, it is water resistant.

In case of batteries - use some LiPo batteries with DC-DC converter to minimum voltage. Maybe you could even add a solar panel or two for addional life extension of batteries.

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