Uno R3 substitution with Micro, Nano or Mini

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i'm working on project space concern.  i'm using uno r3 development platform smaller board more desirable.  once have final code , wire configuration completed, possible transfer code , wiring either micro, nano or mini arduino?  i'm hoping direct transfer without having rewrite code.  in appreciated.  i'm beginning @ enclosures build in, , question has bearing on physical size of enclosure i'll need at.  metal enclosure, not plastic one.   thanks in advance help.

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is possible transfer code , wiring either micro, nano or mini arduino?
to transfer code? no. code needs re-compiled if change hardware. no code changes should needed, though.

the wiring, yes, long recognize functionality happens on different pins on smaller boards.



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