A ProMicro controlling two DFPlayer Mini MP3 players.
1. Is this too ambitious for the ATMega 38u2?
2. Is there a better way to handle the two Tx only ports?
Will there be problems with the different Lib
It could be done, but whether you can do it is an other matter.OK.No.A 38u2 has a USB port as well as a hardware port, so one instance of software serial only would be needed.You can have no idea until you get your plans more solid.