Arduino UNO DFPlayer and expansion shield:
DX,RX and BUSY connections to DFPlayer are made thru this shield.
Connecting this shield to Arduino UNO adds sound, voice commands and music
to your Arduino project, just connect speaker thru Screw terminal connector U6.
Expansion connector headers provide secure connection to other accessories
( LCD, sensors ... etc).
DFPlayer BUSY pin connection to Arduino UNO pin 12 is selectable by
jumpers on JP2.
Accessories with I2C serial interface ( LCD .... etc) plug into 4 pin CN4 connector.