In my own clumsy way, I quote here from the Serial section of the Language reference. "The Arduino Due has three additional 3.3V TTL serial ports: Serial1 on pins 19 (RX) and 18 (TX); Serial2 on pins 17 (RX) and 16 (TX), Serial3 on pins 15 (RX) and 14 (TX). Pins 0 and 1 are also connected to the co…

How to program Due serial ports

ard_newbie November 16, 2017, 7:22am 10

If the sketch in my reply #7 doesn't work, I guess your board is out of order.

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