Size as the mega is only the older uno size board...
Price is not the issue usually as people are hanging expensive
displays and what not.
For a lot of stuff the Nano EVery was a solver for me as it fit the footprint.
Less EEprom for the aps i do it not an issue.
If the number of write cycles are low I think flash can be used as well.
Allison
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Please use the forum, offline and private will go to bit bucket.