Arduino - MP3 Player

In this tutorial, we will learn how to make a MP3 player using Arduino, MP3 player module, Micro SD Card, and speaker. The MP3 files (music, or recorded audio) are stored in the micro SD Card. Then, Arduino can control the MP3 player module to read a selected song from SD Car, convert it to audio signal, snd send the signal to the speaker. In detail, we will learn:

Then, you can modify the code to add a potentiometer or rotatry encoder to change the volume.

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Serial MP3 Player Module
1×Micro SD Card
1×3.5mm Aux Speaker
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino
1×(Recommended) Screw Terminal Block Shield for Arduino Uno
1×(Optional) Transparent Acrylic Enclosure For Arduino Uno

Or you can buy the following sensor kit:

1×DIYables Sensor Kit 30 types, 69 units
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.

About Serial MP3 Player Module and Speaker

Serial MP3 Player Module Pinout

A serial MP3 player module has three interfaces:

  • The interface to Arduino includes 4 pins:
    • RX pin: data pin, needs to be connected a TX pin of Arduino (Hardware or Software Serial)
    • TX pin: data pin, needs to be connected a RX pin of Arduino (Hardware or Software Serial)
    • VCC pin: power pin, needs to be connected to VCC (5V)
    • GND pin: power pin, needs to be connected to GND (0V)
  • The interface to the speaker is a 3.5mm Aux output female jack.
  • The interface to the Micro SD Card is a Micro SD Card Socket in the back of the module.
Serial MP3 Player Module Pinout
image source: diyables.io

Speaker Pinout

A speaker usually has two interfaces:

  • Audio signal interface: it is 3.5mm Aux male connector that connects to the MP3 player module
  • Poweer interface: it can be USB, 5V power adapter or any other power interface

How It Works

What we need to prepare:

  • Pre-store a list of songs or recorded audio that we want to play to micro SD Card.
  • Insert the micro SD Card to the MP3 player module
  • Connect the MP3 player module to Arduino
  • Connect the speaker to the MP3 player module to a
  • Connect the speaker to a power source.

Each MP3 file stored on Micro SD Card will have an index. The index is the order of stored song, start from 0.

Then we can program Arduino to send command to the MP3 player module. It supports the following commands:

  • Play
  • Pause
  • Play Next
  • Play Previous
  • Change volume

When the MP3 player module, it reads the MP3 file from the micro SD Card, converts the MP3 files to audio signal and outputs the audio signal to the speaker via the 3.5mm Aux interface.

Wiring Diagram

Arduino MP3 player module Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Arduino Code - Play Music

The below code plays the first song stored on the Micro SD Card.

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-mp3-player */ #include <SoftwareSerial.h> #define CMD_PLAY_NEXT 0x01 #define CMD_PLAY_PREV 0x02 #define CMD_PLAY_W_INDEX 0x03 #define CMD_SET_VOLUME 0x06 #define CMD_SEL_DEV 0x09 #define CMD_PLAY_W_VOL 0x22 #define CMD_PLAY 0x0D #define CMD_PAUSE 0x0E #define CMD_SINGLE_CYCLE 0x19 #define DEV_TF 0x02 #define SINGLE_CYCLE_ON 0x00 #define SINGLE_CYCLE_OFF 0x01 #define ARDUINO_RX 7 // Arduino Pin connected to the TX of the Serial MP3 Player module #define ARDUINO_TX 6 // Arduino Pin connected to the RX of the Serial MP3 Player module SoftwareSerial mp3(ARDUINO_RX, ARDUINO_TX); void setup() { Serial.begin(9600); mp3.begin(9600); delay(500); // wait chip initialization is complete mp3_command(CMD_SEL_DEV, DEV_TF); // select the TF card delay(200); // wait for 200ms mp3_command(CMD_PLAY, 0x0000); // Play mp3 //mp3_command(CMD_PAUSE, 0x0000); // Pause mp3 //mp3_command(CMD_PLAY_NEXT, 0x0000); // Play next mp3 //mp3_command(CMD_PLAY_PREV, 0x0000); // Play previous mp3 //mp3_command(CMD_SET_VOLUME, 30); // Change volume to 30 } void loop() { } void mp3_command(int8_t command, int16_t dat) { int8_t frame[8] = { 0 }; frame[0] = 0x7e; // starting byte frame[1] = 0xff; // version frame[2] = 0x06; // the number of bytes of the command without starting byte and ending byte frame[3] = command; // frame[4] = 0x00; // 0x00 = no feedback, 0x01 = feedback frame[5] = (int8_t)(dat >> 8); // data high byte frame[6] = (int8_t)(dat); // data low byte frame[7] = 0xef; // ending byte for (uint8_t i = 0; i < 8; i++) { mp3.write(frame[i]); } }

Quick Steps

  • Follow the instructions on the How It Works
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Enjoy the music

Arduino Code - Play Music with control buttons

The below code is an upgrade of the previous code. It adds foyr buttons to let you interact with MP3 player.

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-mp3-player */ #include <SoftwareSerial.h> #include <ezButton.h> #define CMD_PLAY_NEXT 0x01 #define CMD_PLAY_PREV 0x02 #define CMD_PLAY_W_INDEX 0x03 #define CMD_SET_VOLUME 0x06 #define CMD_SEL_DEV 0x09 #define CMD_PLAY_W_VOL 0x22 #define CMD_PLAY 0x0D #define CMD_PAUSE 0x0E #define CMD_SINGLE_CYCLE 0x19 #define DEV_TF 0x02 #define SINGLE_CYCLE_ON 0x00 #define SINGLE_CYCLE_OFF 0x01 #define ARDUINO_RX 7 // Arduino Pin connected to the TX of the Serial MP3 Player module #define ARDUINO_TX 6 // Arduino Pin connected to the RX of the Serial MP3 Player module SoftwareSerial mp3(ARDUINO_RX, ARDUINO_TX); ezButton button_play(2); // create ezButton object that attach to pin 2 ezButton button_pause(3); // create ezButton object that attach to pin 3 ezButton button_next(4); // create ezButton object that attach to pin 4 ezButton button_prev(5); // create ezButton object that attach to pin 5 void setup() { Serial.begin(9600); mp3.begin(9600); delay(500); // wait chip initialization is complete mp3_command(CMD_SEL_DEV, DEV_TF); // select the TF card delay(200); // wait for 200ms button_play.setDebounceTime(50); // set debounce time to 50 milliseconds button_pause.setDebounceTime(50); // set debounce time to 50 milliseconds button_next.setDebounceTime(50); // set debounce time to 50 milliseconds button_prev.setDebounceTime(50); // set debounce time to 50 milliseconds } void loop() { button_play.loop(); // MUST call the loop() function first button_pause.loop(); // MUST call the loop() function first button_next.loop(); // MUST call the loop() function first button_prev.loop(); // MUST call the loop() function first if (button_play.isPressed()) { Serial.println("Play mp3"); mp3_command(CMD_PLAY, 0x0000); } if (button_pause.isPressed()) { Serial.println("Pause mp3"); mp3_command(CMD_PAUSE, 0x0000); } if (button_next.isPressed()) { Serial.println("Play next mp3"); mp3_command(CMD_PLAY_NEXT, 0x0000); } if (button_prev.isPressed()) { Serial.println("Play previous mp3"); mp3_command(CMD_PLAY_PREV, 0x0000); } } void mp3_command(int8_t command, int16_t dat) { int8_t frame[8] = { 0 }; frame[0] = 0x7e; // starting byte frame[1] = 0xff; // version frame[2] = 0x06; // the number of bytes of the command without starting byte and ending byte frame[3] = command; // frame[4] = 0x00; // 0x00 = no feedback, 0x01 = feedback frame[5] = (int8_t)(dat >> 8); // data high byte frame[6] = (int8_t)(dat); // data low byte frame[7] = 0xef; // ending byte for (uint8_t i = 0; i < 8; i++) { mp3.write(frame[i]); } }

The wiring diagram for the above code:

Arduino MP3 player speaker Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Now, you can modify the projects to add more functions, for example:

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Function References

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