Qwiic MP3 Trigger

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Sometimes you just need an MP3 to play. Whether it’s a sound track as you enter the room or a pirate cackling when a dollar gets donated to the kid’s museum. The Qwiic MP3 Trigger takes care of all the necessary bits, all you need to do is send a simple I2C command and listen.

This version is an improvement over the original! We’ve moved the BUSY pin so the amplifier shuts down at the end of each track eliminating any buzzing from an external speaker.

We’ve tried to think of everything a user may need. The Qwiic MP3 Trigger comes with a microB connector and the WT2003S MP3 decoder IC that gives you access to the files on the microSD card. Simply plug in the Qwiic MP3 Trigger and you’ll be transferring MP3s. No need for drivers and no need for WAV or Vorbis conversion! Sound output is provided via a headphone jack or poke-home connector allowing an external speaker to be connected without soldering (be sure to see the note below). The speaker is boosted by a Class-D mono amplifier capable of outputting up to 1.4W. What does 1.4W mean? It’s incredibly loud; great for making sure your mech effects are heard on the *con floor and wonderful for annoying your officemates. Volume is software selectable between 32 levels. Equalization can be tuned to be sure your classical hits sound different from your jazz dance routines (in all seriousness EQ selection is available but it’s pretty paltry).

And if you don’t want to deal with any programming, there are four trigger pins. When pin 3 is pulled low the T003.mp3 file will immediately be played. This allows you to start playing sound effects with the touch of a button! By pulling multiple pins down simultaneously the four triggers can play up to ten tracks: T001 to T010.

All settings including volume, EQ, and I2C address are stored in NVM and loaded at each power up. The I2C address of the Qwiic MP3 Trigger can be modified via a solder jumper or be assigned using a software command. Multiple Qwiic MP3 Triggers can be chained together on a single bus allowing for simultaneous track mixing and triggering.

We’ve provided a full suite of example sketches to get you started including: play track X, change volume, play next/previous, check if track is playing, stop play, change EQ, and change I2C address.

For a limited time we are including a 1GB microSD card with every Qwiic MP3 Trigger purchased. These are perfect to store over 600 minutes of MP3s. We’ve preloaded the microSD card with four license-free MP3s so you can begin to blast sound effects immediately.

This board is one of our many Qwiic compatible boards! Simply plug and go. No soldering, no figuring out which is SDA or SCL, and no voltage regulation or translation required!

We do not plan to regularly produce SparkX products so get them while they’re hot!

Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum for support or to ask a question.
  • Operating voltage: 3.3V
  • Current consumption:
    • 40mA standy
    • 40mA when playing over headphones at any volume level
    • 150mA-300mA when driving external 8Ω speaker at full volume setting
  • Volume, EQ setting, and I2C address settings stored in non-volatile memory and loaded at each power-on
  • WT2003S MP3 decoder IC provides USB access to microSD socket (up to 32GB) and MP3 decoding
  • ATtiny84 receives I2C commands and controls the MP3 decoder
  • Poke-home connector allows for sturdy but temporary speaker connection without soldering
  • Trigger pins 1, 2, 3, and 4. When pins 1+4 are pulled low simultaneously T005.mp3 will play
  • Built-in TPA2005D1 based 1.4W Class-D mono amplifier
  • Address jumper to select between I2C address 0x37 (default) and 0x38. I2C address is also configurable via software to one of 110 different addresses.

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