SparkFun Qwiic MP3 Trigger

The SparkFun Qwiic MP3 Trigger is a practical solution for those moments when you need an MP3 to play. It simplifies the process of playing your favorite tunes or sound effects, all you need to do is send a simple I²C command and listen to whatever is on your micro SD card. Thanks to the Qwiic system, you can connect it to the rest of your system without any soldering. However, if you prefer to use a breadboard, 2.54mm-spaced pins are also available.

The Qwiic MP3 Trigger is user-friendly. When you connect a USB-C cable, the contents of the microSD card appear as a jump drive. This makes transferring MP3s a breeze, with no need for drivers or WAV or Vorbis conversion. The sound output is provided via a 3.5mm headphone jack or poke-home connector, allowing an external speaker to be connected without soldering. The speaker is boosted by a Class-D mono amplifier capable of outputting up to 1.4W, ensuring an impressive sound quality.

One of the key features of the Qwiic MP3 Trigger is its ability to play sound effects with the touch of a button. This is made possible by the four trigger pins. When pin 3 is pulled low, the T003.mp3 file will immediately be played. By pulling multiple pins down simultaneously, the four triggers can play up to ten tracks. A total of 255 tracks can be loaded onto the SD card and triggered via the I2C interface.

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. You can even chain multiple Qwiic MP3 Triggers together on a single bus for simultaneous track mixing and triggering.

The SparkFun Qwiic MP3 Trigger is also compatible with an extensive Arduino library, making MP3 playing over I²C simple and straightforward. All the basic functions like play tracks, change volume, play next/previous, check if track is playing, stop play, change EQ, and change I²C address are all supported.

Note: This unit has the firmware updated to v1.2 to avoid the auto-loop bug of the previous version. All aspects of the board function identically but the 'Pause' command is no longer supported.

The SparkFun Qwiic Connect System is an ecosystem of I²C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.

Features:

• 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
• microSD supports 128MB to 32GB cards
• 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
• Up to 255 tracks can be loaded onto the SD card and triggered via the I2C interface
• 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.
• USB-C Connector
• Qwiic Connector