Control of uMP3 Volume

Comments

• Chris Savage Parallax Engineering Posts: 14,406

  2007-06-25 01:23 edited 2007-06-25 01:23

  Guido,
  
  I believe the uMP3 wants the value in ASCII text, which would mean you’d use a command like the one below. Take care.
  

  SEROUT TX,BAUD,[noparse][[/noparse]"PC ST V 120", CR]
  

  
  But if you wanted to use a variable you could use:
  
  

  SEROUT TX,BAUD,[noparse][[/noparse]"PC ST V ",DEC volume, CR]
  

  
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  Chris Savage
  Parallax Tech Support
• Vern Graner Posts: 337

  2007-06-25 23:17 edited 2007-06-25 23:17

  Guido said...
  Trying to control the volume of the Rogue uMP3 Player with the Stamp without much or should we say any success.

  
  I had luck using this routine on a BSIIp to fade out the music from a uMP3 in a device I built:
  
  

  
  ' ************************
  ' * I/O Definitions      *
  ' ************************
       MP3music    PIN 3  ' uMP3b: set the pin where the uMP3 "R" pin is connected MUSIC
  
  
  ' ************************
  ' * Variables            *
  ' ************************
    ' Rogue uMP3 player
      Volume           VAR   Byte      ' uMP3 Volume control variable 0-255, 0= loudest
  
  
  ' ************************
  ' * Constants            *
  ' ************************
    'uMP3 Settings
      uMP3Baud        CON     T9600 ' uMP3 music player
      DefaultVolume   CON     0     ' Default volume level
      FadeTime        CON     30    ' Delay between volume commands in fade routines
      MinVolume       CON     80    ' Minimum volume
      VolumeStep      CON     2     ' Volume fade steps
  
  
  '***********************
  '* Fade out music      *
  '***********************
      Volume = DefaultVolume
      DO WHILE Volume < MinVolume
        SEROUT MP3music,uMP3Baud,[noparse][[/noparse]"PC V ",DEC Volume,CR]
        Volume = Volume + VolumeStep
        PAUSE FadeTime
      '  DEBUG "PC V ",DEC Volume,CR
      LOOP
  
  
  

  
  
  
  The above assumes the uMP3 is already playing music. [noparse]:)[/noparse]
  
  Also, remember that ZERO is the LOUDEST setting.. sorta counter-intuitive, but once u have it coded its a non-issue [noparse]:)[/noparse]
  
  Vern
  
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