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After thinking a bit more, I realize using the tx and rx on my uno while also using a serial.print function is basically trying to do two things over the same pins. The tx and rx on the uno connect to the computer’s usb cord, correct?

Therefore, Ithink what I need to do is get another arduino mega (my slave is currently a mega so I can have more outputs). Then, if I want to communicate between the arduinos, I use one of the other three tx/rx ports, and if I want to talk to the computer at the same time, I use tx/rx #1. Am I on the right track?