Control of uMP3 Volume

Guido

Trying to control the volume of the Rogue uMP3 Player with the Stamp without much or should we say any success. I am sure that I have something wrong in the code. Any help would be appreciated.

VOLFULL:································ 'Reset the volume to "full"
· SEROUT TX,BAUD,[noparse][[/noparse]"PC ST V ",120,CR]
· PAUSE 500
· RETURN
VOLLOW:································· 'Reset the volume to "LOW"
· SEROUT TX,BAUD,[noparse][[/noparse]"PC ST V ",254,CR]
· PAUSE 500
· RETURN

Thank You
Guido

Chris Savage

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

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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