Sparkfun MP3 Trigger




$49.99 ea.

MP3 sound integration is easier than ever with 18 external trigger pins that will trigger pre-selected tracks, and a full-duplex serial control port that provides full transport control, remote triggering for up to 256 tracks, and fast real-time volume control.

Description [Hide]

The heart of the MP3 Trigger board is the Cypress PSoC CY8C29466-24SXI microcontroller which serves up MP3 data to a VLSI VS1063 audio codec IC. This version also supports an optional initialization file that can be used to set the serial port baud rate as well as to reprogram any of the 18 trigger inputs to alternate functions, including random and sequential track selection, transport controls and even volume up/down. Each conventional trigger can be set to either allow immediate restarts, or to lock out restarts if audio is playing. A new trigger filename convention provides greater flexibility in naming your MP3 tracks and makes file management easier, and optimized code now achieves 192Kbps stereo playback from a wider range of cards than before.

There is also a “Quiet Mode” feature that can be enabled via the serial control port. In this mode, the trigger inputs don’t start tracks directly, but instead produce a serial message indicating which triggers were activated. A host microcontroller can thus monitor the trigger inputs and then start any track or sequence of tracks via the serial control port, making the triggers much more flexible.

Note: This product is a collaboration with Jamie Robertson. A portion of each sales goes back to them for product support and continued development.


  • Input voltage: 4.5-12VDC
  • Current Consumption: 45mA idle, 85mA playing
  • File storage: FAT16 formatted SDSC or FAT32 formatted SDHC micro-SD flash memory cards
  • Audio out: 1/8" stereo headphone
  • Trigger inputs: 3.3-5V, active low inputs with internal pull-ups
  • Serial: Full duplex, 8N1, 38.4K baud

Documentation [Hide]

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