but we are running out of memory and I/O pins on an standard UNO board.
I/O pins are no problem, a port expander chip or two will soon solve that. Memory is another issue however.Rather than have two processors, which is rarely a good idea, why not use a bigger processor like an ATmega 644 or one of the Mega board processors like the 1280. Finally if that is not enough why not go for an Arduino Due?
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