NB: Pins 10, 11, 12 and 13 are reserved for interfacing with the Ethernet module and should not be used otherwise. ]
Each of the 14 digital pins on the Ethernet board can be used as an input or output ...
It's even more confusing as the answer is different depending on whether you'll connect the Ethernet Shield to an Uno or Mega.
QuoteEach of the 14 digital pins on the Ethernet board can be used as an input or output ... Which is correct?
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via Egeo 16