It looks to me like you have the FTDI TXD connected to the 2560 TXD, instead of to RXD (and similarly for the other serial signal.)Is there some class that is designing and building 2560 "custom boards" as a class assignment/project? There have been an awful lot of "I have a custom 2560 board that isn't quite working" questions recently. (If so, I'm a bit jealous. That sounds like a great learning experience.)
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