MP3 Trigger

Item number 55571 Brand Sparkfun Model WIG-13720 Share Write a review
MP3 Trigger

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The MP3 Trigger board is an innovative solution for your sound integration needs. It features 18 external trigger pins that can directly initiate pre-selected MP3 tracks. The board also includes a full-duplex serial control port that offers full transport control, remote triggering for up to 256 tracks, and fast real-time volume control. MP3s are stored on FAT16 formatted SDSC or FAT32 formatted SDHC micro-SD flash memory cards. The board is designed to achieve 192Kbps stereo playback from a wide range of cards.

At the core of the MP3 Trigger board is the Cypress PSoC CY8C29466-24SXI microcontroller. This microcontroller delivers MP3 data to a VLSI VS1063 audio codec IC. This version of the board also supports an optional initialization file that can be used to set the serial port baud rate and reprogram any of the 18 trigger inputs to alternate functions. These functions include 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.

The MP3 Trigger board also features a "Quiet Mode". In this mode, the trigger inputs don't start tracks directly, but instead generate a serial message indicating which triggers were activated. This allows a host microcontroller to monitor the trigger inputs and then start any track or sequence of tracks via the serial control port, making the triggers much more flexible.

This version of the MP3 Trigger includes firmware that supports the use of an initialization file on the microSD card. This file can be used to change the serial baud rate and repurpose any of the 18 trigger inputs to alternate functions. In addition, a restart lockout option can be used to prevent any trigger from starting a track if audio is already playing. These features make the MP3 Trigger board highly adaptable for custom applications.

Note: This product is a collaboration with Robertsonics. A portion of each sale is given back to them for product support and continued development.


  • Input Voltage Range: 4.5V to 12.0V DC, or regulated 3.3V (jumper selectable)
  • Current Consumption: Approximately 45mA idle, 85mA playing
  • Media: SDSC and SDHC microSD cards
  • File system: FAT32 and FAT16
  • Audio output: Headphone stereo (3.5mm stereo jack)
  • Trigger inputs: Logic level 3.3V–5.0V, active low inputs, with internal pull-ups (connector provides individual grounds, allowing switches or jumpers to be connected directly to each trigger input)
  • Serial: Full duplex, 8-bit, 38.4Kbaud (default, other baud rates supported via initialization file)


  • Schematic
  • Eagle Files
  • Hookup Guide
  • Datasheet (VS1063)
  • Datasheet (CY8C29466-24SXI)
  • Robertsonics MP3 Trigger
  • Firmware Updates
  • GitHub


Brand information
Brand Sparkfun
More infoMP3 Trigger Hookup Guide V24 - SparkFun Learn
€ 54,50€ 45,05 Excl. VAT (NL)
Ordered before 23:59, shipped today. ... pieces in stock Almost sold out
Show volume discounts Shipped from € 5,95 (NL) 30 days cooling-off Excellent service

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