Introduction

The MP3-TF-16P module is a low-cost, high-quality audio playback solution that supports MP3 and WAV files from micro SD cards. Featuring a built-in DAC and amplifier, this module provides simple serial control and requires minimal external components.

Key Features

Technical Specifications

Pin Configuration

Pin	Label	Description	Connection
1	VCC	Power (5V recommended)	5V
2	RX	Serial Receive	Arduino TX
3	TX	Serial Transmit	Arduino RX
4	DAC_R	Right Audio (not used)	–
5	DAC_L	Left Audio Output	Speaker+
6	GND	Ground	GND
7	SPK1	Amplifier Output+	Speaker+
8	SPK2	Amplifier Output-	Speaker-
9	IO1	GPIO (optional)	–
10	IO2	GPIO (optional)	–
11	ADKEY1	Analog Key 1	–
12	ADKEY2	Analog Key 2	–
13	BUSY	Playback Status	Digital Input
14	RESET	Active Low Reset	–
15	GND	Ground	GND
16	GND	Ground	GND

Basic Wiring with Arduino

// Basic Connections:
// MP3 Module VCC → Arduino 5V
// MP3 Module GND → Arduino GND
// MP3 Module RX → Arduino TX (Pin 11)
// MP3 Module TX → Arduino RX (Pin 10)
// Speaker+ → SPK1 or DAC_L
// Speaker- → SPK2 or GND

Library Setup

DFRobot / DFRobotDFPlayerMini Library Arduino

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1. Install the DFRobotDFPlayerMini library via Arduino Library Manager
2. Include the library and SoftwareSerial in your sketch:

   #include "SoftwareSerial.h"
   #include "DFRobotDFPlayerMini.h"

3. Set up the serial connection:

   SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
   DFRobotDFPlayerMini myDFPlayer;

    

Basic Playback Example

#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

//Inicia a serial por software nos pinos 10 e 11
SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
DFRobotDFPlayerMini myDFPlayer;
char command;
int pausa = 0;

void setup()
{
  delay (2000);
//Comunicacao serial com o modulo
mySoftwareSerial.begin(9600);
//Inicializa a serial do Arduino
Serial.begin(115200);
//Verifica se o modulo esta respondendo e se o
//cartao SD foi encontrado
Serial.println();
Serial.println(F("DFRobot DFPlayer Mini"));
Serial.println(F("Initializing DFPlayer module ... Wait!"));

if (!myDFPlayer.begin(mySoftwareSerial))
{
Serial.println(F("Not initialized:"));
Serial.println(F("1. Check the DFPlayer Mini connections"));
Serial.println(F("2. Insert an SD card"));
while (true);
}

Serial.println();
Serial.println(F("DFPlayer Mini module initialized!"));

//Definicoes iniciais
myDFPlayer.setTimeOut(500); //Timeout serial 500ms
myDFPlayer.volume(5); //Volume 5
myDFPlayer.EQ(0); //Equalizacao normal
menu_opcoes();
}

void loop()
{

//Waits for data entry via serial
while (Serial.available() > 0)
{
command = Serial.read();

if ((command >= '1') && (command <= '9'))
{
Serial.print("Music reproduction");
Serial.println(command);
command = command - 48;
myDFPlayer.play(command);
menu_opcoes();
}

//Reproduction
//Stop

if (command == 's')
{
myDFPlayer.stop();
Serial.println("Music Stopped!");
menu_opcoes();
}

//Pausa/Continua a music
if (command == 'p')
{
pausa = !pausa;
if (pausa == 0)
{
Serial.println("Continue...");
myDFPlayer.start();
}

if (pausa == 1)
{
Serial.println("Music Paused!");
myDFPlayer.pause();
}

menu_opcoes();
}


//Increases volume
if (command == '+')
{
myDFPlayer.volumeUp();
Serial.print("Current volume:");
Serial.println(myDFPlayer.readVolume());
menu_opcoes();
}

if (command == '<')
{
myDFPlayer.previous();
Serial.println("Previous:");
Serial.print("Current track:");
Serial.println(myDFPlayer.readCurrentFileNumber()-1);
menu_opcoes();
}

if (command == '>')
{
myDFPlayer.next();
Serial.println("next:");
Serial.print("Current track:");
Serial.println(myDFPlayer.readCurrentFileNumber()+1);
menu_opcoes();
}

//Decreases volume
if (command == '-')
{
myDFPlayer.volumeDown();
Serial.print("Current Volume:");
Serial.println(myDFPlayer.readVolume());
menu_opcoes();
}

}
}

void menu_opcoes()
{
Serial.println();
Serial.println(F("=================================================================================================================================="));
Serial.println(F("Commands:"));
Serial.println(F(" [1-3] To select the MP3 file"));
Serial.println(F(" [s] stopping reproduction"));
Serial.println(F(" [p] pause/continue music"));
Serial.println(F(" [+ or -] increases or decreases the volume"));
Serial.println(F(" [< or >] forwards or backwards the track"));
Serial.println();
Serial.println(F("================================================================================================================================="));
}

File Preparation

1. Format micro SD card as FAT32
2. Create a folder named mp3 in the root directory
3. Name your audio files as 0001.mp3, 0002.mp3, etc.
4. Insert card into module before powering on

Advanced Features

myDFPlayer.volume(10);  // 0-30
myDFPlayer.volumeUp();  // Increase
myDFPlayer.volumeDown();// Decrease

myDFPlayer.play(1);    // Play specific track
myDFPlayer.next();     // Next track
myDFPlayer.previous(); // Previous track
myDFPlayer.pause();    // Pause playback
myDFPlayer.start();    // Resume playback

// Available presets:
// Normal, Pop, Rock, Jazz, Classic, Bass
myDFPlayer.EQ(DFPLAYER_EQ_BASS);

uint16_t track = myDFPlayer.readCurrentFileNumber();
uint16_t volume = myDFPlayer.readVolume();
uint16_t state = myDFPlayer.readState();

Troubleshooting