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If you want to take your Arduino gadget mobile, or simply protect it from dust, you’ll need to secure it inside some sort of portable, durable case. Properly, such cases are called “Arduino project enclosures.”
Since almost any smallish, box-like object has enclosure potential, this is an arena where your creativity can really take off. Just browse any retail store specializing in home, school, and office storage products, and your head will start to spin with the possibilities.