Introduction: Arduino MP3 Shield

By Mohannad Rawashdeh
About: Maker, PCB designer , electronics instructor from Jordan just one word ! I Adore electronics follow me on FB https://www.facebook.com/Mohannad-Rawashdeh-Raw-774983565988641/

Hi , I would today to share my experiment with MP3 Shield from ELECHOUSE , this Shield have Inboard Keys which is can control the Audio file very easy , Support FAT16 And FAT32 , And can read MP3 , WAV Format from SD Card ,  U disk , and from Build in SPI Flash memory , that Give you an ability to save your Audio file on the Board and play it later, so no need to External Storage device .

as I mentioned before , this shield Has Inboard Keys to control the Audio file , and You can Control the Audio File by Programming from Arduino , You can program your Audio when it's begin , Switch between file and Control the Volume Up and Down very easy .

I want to Show you How we can Play Audio from SD Card and U Disk . 

The component that we need is : 

1)  Arduino Board .
2) Arduino USB-SD MP3 Shield From ELECHOUSE You can buy it from  here  .
3) SD Card With adapter.Or  USB Flash .
4) Speakers Or Headset .


Step 1: Arduino MP3 Shield

The Arduino MP3 Shield Have many Advantages such like   Control by Serial UART interface or keys onboard , Have Build in Audio Amplifier 3W , and has On board 64MBit SPI-FLASH, which you can Save Your Audio file , and play it later .

This Shield can controlled from Arduino By Hardware Serial "Rx  D0 , Tx  D1 " and  By Software Serial " RX  D7  , Tx  D8" So at first You can  Use Hardware serial , easy to use but you must remove the shield when you want to Upload new sketch .

You can change The Serial interface pin by solder tools , Just remove the solder from Upper 2 pads and solder a small bridge between the 2 pads below to active Software serial Pin . look to the image attached to see these 3 pads .  

You can also Bridge amplifier control bridge so you can turn on  or Off by solder Amplifier Control pin , so This pin attached to arduino D9 Pin , I didn't use it in this experiment 

You can also Solder Pin header on This shield "Look at the Picture" So You can connect Speakers to this shield 

Step 2: Prepare Your Audio File

You can play 2 audio file  format , MP3 And WAV , Before you can play your Audio file on this shield you must : 

1) Copy your Audio File to SD Card or U- disk storage Device .

2) Add prefix 0000~9999 to the file names like 0000-My music.mp3 So the shield deal with the Files number , Not with Names .

3)  insert Storage device on the shield  , power it on .

So let's see how we can control the audio file .

Step 3: Play the Audio File

What ever if you are modify This shield to control it via Software serial or leave it  as Hardware serial  , Just you need is upload the sketch below to your arduino  , in this step You can control the Audio file , Play , pause , Volume up and down , and Put the shield in sleep mode ,  through The button on Board .

This code for play sond from SD Card , you can  change it to play U Disk , read the code  below .

Upload this code if you are Using Software serial  :
//..............................................................................................
//Written by : Mohannad Rawashdeh
// this code For MP3 Shield Elechosue
// Software serial interface
// For product : http://www.elechouse.com/elechouse/index.php?main_page=product_info&cPath=168_170&products_id=2193
//https://www.instructables.com/member/Mohannad+Rawashdeh/
#include <SoftwareSerial.h>
SoftwareSerial Geno(7,8); // Rx , Tx
unsigned char cmd_buf[10];
unsigned char i;

void ArduinoMP3Shield_SendCMD(unsigned char *cmd_buf, unsigned len)
{
    unsigned i;
    for(i=0; i<len; i++){
        Geno.write(cmd_buf[i]);
    }
}

void setup(void)
{
    /** wait until arduino mp3 shield get ready */
    delay(1000);

    Geno.begin(9600);

    /** set volume */
    cmd_buf[0] = 0x7E;          // START
    cmd_buf[1] = 0x03;          // Length
    cmd_buf[2] = 0xA7;          // Command
    cmd_buf[3] = 0x0F;          // new volume
    cmd_buf[4] = 0x7E;          // END
    ArduinoMP3Shield_SendCMD(cmd_buf, 5);

    /** set play mode repeat all */
    cmd_buf[0] = 0x7E;          // START
    cmd_buf[1] = 0x03;          // Length
    cmd_buf[2] = 0xA9;          // Command SET MODE
    cmd_buf[3] = 0x02;          // set mode
    cmd_buf[4] = 0x7E;          // END
    ArduinoMP3Shield_SendCMD(cmd_buf, 5);

    /** select SD card first music and play */
    cmd_buf[0] = 0x7E;          // START
    cmd_buf[1] = 0x04;          // Length
    cmd_buf[2] = 0xA0;          //  For U Disk change this line to 0xA2 
    cmd_buf[3] = 0x00;          // file number high byte
    cmd_buf[4] = 0x01;          // file number low byte
    cmd_buf[5] = 0x7E;          // END
    ArduinoMP3Shield_SendCMD(cmd_buf, 6);
}

void loop(void)
{

}

//..............................................................................................


 Upload this code if you are Using Hardware serial  :

//.......................................................................

// this code For MP3 Shield Elechosue
// Software serial interface
// For product : http://www.elechouse.com/elechouse/index.php?main_page=product_info&cPath=168_170&products_id=2193
//https://www.instructables.com/member/Mohannad+Rawashdeh/

unsigned char cmd_buf[10];
unsigned char i;

void ArduinoMP3Shield_SendCMD(unsigned char *cmd_buf, unsigned len)
{
    unsigned i;
    for(i=0; i<len; i++){
        Serial.write(cmd_buf[i]);
    }
}

void setup(void)
{
    /** wait until arduino mp3 shield get ready */
    delay(1000);

    Serial.begin(9600);

    /** set volume */
    cmd_buf[0] = 0x7E;          // START
    cmd_buf[1] = 0x03;          // Length
    cmd_buf[2] = 0xA7;          // Command
    cmd_buf[3] = 0x0F;          // new volume
    cmd_buf[4] = 0x7E;          // END
    ArduinoMP3Shield_SendCMD(cmd_buf, 5);

    /** set play mode repeat all */
    cmd_buf[0] = 0x7E;          // START
    cmd_buf[1] = 0x03;          // Length
    cmd_buf[2] = 0xA9;          // Command SET MODE
    cmd_buf[3] = 0x02;          // set mode
    cmd_buf[4] = 0x7E;          // END
    ArduinoMP3Shield_SendCMD(cmd_buf, 5);

    /** select SD card first music and play */
    cmd_buf[0] = 0x7E;          // START
    cmd_buf[1] = 0x04;          // Length
    cmd_buf[2] = 0xA0;          // Command For U Disk change this line to 0xA2
    cmd_buf[3] = 0x00;          // file number high byte
    cmd_buf[4] = 0x01;          // file number low byte
    cmd_buf[5] = 0x7E;          // END
    ArduinoMP3Shield_SendCMD(cmd_buf, 6);
}

void loop(void)
{

}

Attachments

Step 4: Control the Audio Using Aduino

You can control the audio Play , pause , and Volume up and down , Depend on commands you program it on arduino , You Just send Serial Command , It's too easy to send command , this Sketch below show  this method .

No need to library to program it , But if you want there is a Library for this Shield you can Download it from Here 

//..............................................................................
// Mohannad Rawashdeh
// MP3 1.2V Shield test .
#include <SoftwareSerial.h>
SoftwareSerial Geno(7,8); // Rx , Tx
unsigned char Data[10];
unsigned char i;

void setup() {
  // put your setup code here, to run once:
  Geno.begin(9600);
  SetVolume(20); // set volume from 0-31
  delay(1000);
  FileSource('SD_card',0x05);
  SetPlayMode('Single_play');
  delay(5000);
  play_pause();// Pause
  delay(3000);
  FileSource('SD_card',0x01);
  play_pause(); // play
  delay(5000);
  Next();
  delay(5000);
  Next();
  for(int v=15;v>0;v--){
  SetVolume(v); // set volume from 0-31
  delay(1000);
  }
  for(int j=0;j<15;j++){
  SetVolume(j); // set volume from 0-31
  delay(500);
  }
  delay(1000);
  FileSource('SD_card',0x04);
  delay(5000);
  FileSource('SD_card',0x05);
// FileSource('SD_card',0x03);

  //Stop();
}

void loop() {
  // put your main code here, to run repeatedly:

}
// Select File sorce "SD Card, SPI Flash , U Disk "
void FileSource( char type, byte track ){
  play_pause();// Pause
   Data[0] = 0x7E; 
   Data[5] = 0x7E;   
  switch (type){
   case 'SD_card':
          // START
    Data[1] = 0x04;          // Length
    Data[2] = 0xA0;          // Command
    Data[3] = 0x00;          // file number high byte
    Data[4] = track;          // file number low byte 
    break;
    case 'SPI_Flash':
    Data[1] = 0x04;          // Length
    Data[2] = 0xA1;          // Command spi flash 0XA1
    Data[3] = 0x00;          // file number high byte
    Data[4] = track;
   break;
    case 'U_Disk':
    Data[1] = 0x04;          // Length
    Data[2] = 0xA2;          // Command
    Data[3] = 0x00;          // file number high byte
    Data[4] = track;          // file number low byte 
    break;

  }
  Command(Data,5);
  play_pause();// Pause
}

void SetVolume( int vol){
   Data[0] = 0x7E;          // START
   Data[1] = 0x03;          // Length Not 0x02
   Data[2] = 0xA7;          // Command
   Data[3] = vol;          // new volume
   Data[4] = 0x7E;          // END
   Command(Data,5);
}

void SetPlayMode(char type){
   Data[0] = 0x7E;          // START
   Data[4] = 0x7E;          // START
   switch (type){
   case 'Single_play': 
   Data[1] = 0x02;          // Length
   Data[2] = 0xA9;          // Command
   Data[3] = 0x00;          //Mode parameter
   break;
   case 'Repeat_single': 
   Data[1] = 0x02;          // Length
   Data[2] = 0xA9;          // Command
   Data[3] = 0x01;          //Mode parameter
   break;
   case 'Repeat_all': 
   Data[1] = 0x02;          // Length
   Data[2] = 0xA9;          // Command
   Data[3] = 0x02;          //Mode parameter
   break;
   case 'Play_Random': 
   Data[1] = 0x02;          // Length
   Data[2] = 0xA9;          // Command
   Data[3] = 0x03;          //Mode parameter
   break;
}
Command(Data,5);
}
//...............................

void play_pause(){
  Data[0] = 0x7E;          // START
  Data[1] = 0x02;          // Length
  Data[2] = 0xA3;          // Command
  Data[3] = 0x7E;          //Mode parameter
  Command(Data,4);
}

  void Stop(){
  Data[0] = 0x7E;          // START
  Data[1] = 0x02;          // Length
  Data[2] = 0xA4;          // Command
  Data[3] = 0x7E;          //Mode parameter
  Command(Data,4);
}

  void Next(){
  Data[0] = 0x7E;          // START
  Data[1] = 0x02;          // Length
  Data[2] = 0xA5;          // Command
  Data[3] = 0x7E;          //Mode parameter
  Command(Data,4);
}
  void Previous(){
  Data[0] = 0x7E;          // START
  Data[1] = 0x02;          // Length
  Data[2] = 0xA6;          // Command
  Data[3] = 0x7E;          //Mode parameter
  Command(Data,4);
}

void Command(unsigned char *Data, int length){
    for(int i=0; i<length; i++){
    Geno.write(Data[i]);
    }

}

The video Below show to you how it worked  .

Step 5: Final , Document , Helpful Links

This shield Consume about 120mA with 2 speakers 3.2W - 5 Ohm, So it's safe to feed from arduino  and 70mA with no headphone or speakers connected 

For more information about this shield You can return to the Manual of this shield , From Here You can Find all commands for this shield , And how you can save your audio file on Board SPI Flash memory 



I will prepare some projects about this shield and share it with you .

Thank you