Background: I was able to connect a YX5200 mp3 module with an ATTiny1616 development board and play the music successfully using Arduino code. I was using a standard USB socket connected to the MP3 player to read the MP3 file off a USB thumb drive.
I then worked with a PCB designer to help with creating a PCB board to replicate the functionality. I am using the USB thumb drive in this case as well. However, it is not playing any sound. I've spent many hours trying to troubleshoot the connections and code. Any feedback would be greatly appreciated.
Rx should be connected to tx.
If the first argument of softwareSerial mySerial is rx, then you should swap the pin numbers in your program. Way easier than 'rewire' your pcb.
