Hello, I'm not sure if this is the right category but I thinks it's an hardware question.
I've got a question about the Joy-it board pro micro (ATmega32U4), is there a second UART port (Serial1) with the pin TX0 and RX1 or are they only connected to the TX and RX of the USB interface ??
DFPlayerMini Stand-alone (I/O) mode allows for NEXT/PREV by short-pressing DFPlayerMini IO_1 or IO_2 to ground, or VOL+/VOL- by long-pressing IO_1 or IO_2 to ground.