DFPlayer custom sketch

Example sketch for sending commands to the DFPlayer Mini usning Uno without using external libraries.

Sending commands to the DFPlayer Mini

To send a command to the module, follow specific format:
$SB VB LB CMD ACK DATA1 DATA2 CHKS1 CHKS2 $EB

Mark - Byte - Byte description
$SB - 0x7E - Start byte
VB - 0xFF - Version byte
LB - 0xxx - The number of bytes of the command without start and end bytes (In our case 0x06)
CMD - 0xxx - Such as PLAY and PAUSE and so on
ACK - 0xxx - Acknowledge byte 0x00 = not ack, 0x01 = ack
DATA1 - 0xxx - Data high byte
DATA2 - 0xxx - Data low byte
CHKS1 - 0xxx - Checksum high byte
CHKS2 - 0xxx - Checksum low byte
$EB - 0xEF - End byte

We used acknowledge byte equal to 0x01 to get the reponse from the module

Connection diagram

How to use the sketch

The sketch is tested with the DFPlayer mini module:
https://www.az-delivery.de/products/mp3-player-modul?_pos=2&_sid=30d4586b1&_ss=r

In the loop() function we are waiting for a letter to be sent from the Serial Monitor. If you send one of the letters from the loop() function, a specific function will be executed.

When you send commands to the DFPlayer Mini module, the output in the Serial Monitor should look like the output on the following image:

We implemented the most usefull functions for DFPlayer Mini module, but not all of them. You can read about module and exmplanation for parts of the sketch in the eBook:
https://delivery.shopifyapps.com/-/aa9ba10c171b304a/8dec0c102d9f572a