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[on:]

I am a total newb and need a simple answer since I can't seem to figure this out our unfortunately get any support from the vendor (probably since I am asking such a ridiculous question).  Could someone please stop laughing long enough to point me in the right direction and let me know how I send commands to the mp3 shield from my computer?  Do I open up the serial monitor within the Arduino software and type the commands in the top line then press send?  Could someone take a peek at this guide toward bottom of page 8?  http://www.elechouse.com/elechouse/images/product/Arduino%20MP3%20Shield/Arduino%20MP3%20Shield%20User%20Guide.pdf

For example this is what is in the guide to play a file from the sd card (toward bottom of page eight).  Do I type what's below in the top line of the serial monitor and then press send (it doesn't seem to work)?

0x7E 0x04 0xA0 00 02 0x7E

Thanks for your help.

[Reply #1 on:]

So you have some version of their example file running?

Code:

#include <SoftwareSerial.h>
#include <MP3.h>

/** define mp3 class */
MP3 mp3;

void setup()
{
  /** begin function */
  mp3.begin(MP3_SOFTWARE_SERIAL);    // select software serial
//  mp3.begin();                       // select hardware serial(or mp3.begin(MP3_HARDWARE_SERIAL);)
 
  /** set volum to the MAX */
  mp3.volume(0x1F);
 
  /** set MP3 Shield CYCLE mode */
  mp3.set_mode(MP3::CYCLE);
 
  /** play music in sd, '0001' for first music */
  mp3.play_sd(0x0001);
 
  /** play music in USB-disk */
  //mp3.play_usb_disk(0x0001);
 
  /** play music in SPI FLASH */
  //mp3.play_spi_flash(0x0001);
}

void loop()
{
/** function code here */
}

and you've written some code to send the commands you referenced to the board?

[Reply #2 on:]

Thanks for the quick reply.  Now that you mention it I was using the example code but it does not look like there's any commands in the example sketch (told you I was a newb!).  I was also trying this other example code below which plays the songs automatically but I was unable to send any "play, pause, next" commands.  Would you know how I could control the mp3 shield from my computer?  

Code:

//..............................................................................
// 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]);
    }
 
}

[Reply #3 on:]

From your computer, you would send the bytes to the arduino.
The arduino would receive them and send them to the shield.

So for this 6 byte command

0x7E 0x04 0xA0 0x00 0x02 0x7E

you might have

Code:

void loop(){
if (Serial.available()>5){ // 6 or more bytes received?
byte0 = Serial.read(); // read 1st byte
if (byte0 == 0x7E){   // and then the rest if a valid start byte came in
commandArray[0] = byte0
commandArray[1] = Serial.read();
commandArray[2] = Serial.read();
commandArray[3] = Serial.read();
commandArray[4] = Serial.read();
commandArray[5] = Serial.read();

// now send the bytes to the shield using its library commands
...
// all done, go back to looking for PC commands
}
} // end loop

[Reply #4 on:]

Thanks again for your help!  I am getting the following errors;

     sketch_nov10a.cpp: In function 'void loop()':
     sketch_nov10a:46: error: 'byte0' was not declared in this scope
     sketch_nov10a:48: error: 'commandArray' was not declared in this scope
     sketch_nov10a:56: error: expected primary-expression before '...' token
     sketch_nov10a:56: error: expected `;' before '...' token

Would you know the proper format for declaring the above?

Here's what my code looks like after entering in your suggestion;

Code:

//..............................................................................
// 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:

if (Serial.available()>5){ // 6 or more bytes received?
byte0 = Serial.read(); // read 1st byte
if (byte0 == 0x7E){   // and then the rest if a valid start byte came in
commandArray[0] = byte0;
commandArray[1] = Serial.read();
commandArray[2] = Serial.read();
commandArray[3] = Serial.read();
commandArray[4] = Serial.read();
commandArray[5] = Serial.read();

// now send the bytes to the shield using its library commands
...
// all done, go back to looking for PC commands
}
} // end loop
 
}
// 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]);
    }
 
}