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How to protect an arduino from dust and moisture ? I have already made an RPM datalogger using arduino and placed it in industry.I wanted to protect arduino from dust and moisture.I also want to know the life of arduino.

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Well, for that you put it into a box. You can spray the electronics with a special varnish to protect against the moisture.

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    \$\begingroup\$ The special varnish is called conformal coating. \$\endgroup\$ – David Nov 16 '13 at 12:45
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For a reasonably robust housing with fairly low effort, you could try using a Fernco PQC-104 4″ Qwik Cap rubber boot on a 4" PVC drain cap. Both are available for a few dollars from most hardware stores. Then use cable ties to affix your electronics to a knockout cap placed inside.

You can see a few photos of loggers built into these housings at: http://edwardmallon.wordpress.com/2015/10/24/diy-arduino-logger-build-instructions-part-3/

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