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I have an MP3 shield on a Arduino Uno. When using "File Player" I can get the tracks to play by keyboard entry with three digits (001-009).

The problem is that I want to use (SFEMP3Shield > examples > MP3ButtonPlayer2) that is looking for files 1-9. Any file numbers other than 1,2,3,4,5,6,7,8,9 doesn’t work. Any suggestions?

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The playTrack function used in MP3ButtonPlayer2 example plays file with name created with printf format "track%03d.mp3". %03d creates a number prefixed with zeros to lenght 3. For example track005.mp3 or track042.mp3 or track999.mp3.

implementation of the playTrack function:

uint8_t SFEMP3Shield::playTrack(uint8_t trackNo){

  //a storage place for track names
  char trackName[] = "track001.mp3";
  uint8_t trackNumber = 1;

  //tack the number onto the rest of the filename
  sprintf(trackName, "track%03d.mp3", trackNo);

  //play the file
  return playMP3(trackName);
}

change it to:

uint8_t SFEMP3Shield::playTrack(uint8_t trackNo){

  //a storage place for track names
  char trackName[13];
  int trackNumber = trackNo;

  //tack the number onto the rest of the filename
  sprintf(trackName, "track%03d.mp3", trackNumber);

  //play the file
  return playMP3(trackName);
}
  • Thank you, makes sense, but I'm not a programmer, I don't know how to edit the SFEMP3Shield > examples > MP3ButtonPlayer2 to make it work. – Darryl Green Oct 22 '18 at 17:59
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    put the SD card in a computer and rename the files. You should buy an MP3 player, not an Arduino, if you don't want to code – Juraj Oct 22 '18 at 18:10
  • It's part of a larger program that uses code that I have worked out. This is the only thing I haven't been able to work, although Sparkfun says it should out of the box. It just need to play 3 tracks when things happen. I have renamed the tracks may times. Does the code you gave go on the SD card or into the MP3ButtonPlayer2 code? – Darryl Green Oct 22 '18 at 20:02
  • it doesn't go anywhere. it is in the library. (and it's a shame for the author of the library, because it should not be coded as it is) – Juraj Oct 22 '18 at 20:06
  • The SFEMP3Shield library is included in the sketch. What am I supposed to rename the tracks to? When I run File Player I get; – Darryl Green Oct 22 '18 at 20:23

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