https://github.com/DFRobot/DFPlayer-Mini-mp3
5V - VCC GND - GND D2 - RX D1 - xohm - TX
SPK1 - Speaker SPK2 - Speaker
D4 - PULSE - GND D3 - READY - GND
https://github.com/DFRobot/DFPlayer-Mini-mp3
5V - VCC GND - GND D2 - RX D1 - xohm - TX
SPK1 - Speaker SPK2 - Speaker
D4 - PULSE - GND D3 - READY - GND