images are CC BY-NC-SA 3.0
Replacement: WIG-11125. We started making our own version of this board in-house. This page is for reference only.
Description: The SOMO-14D is a tiny audio module that can play back stored audio files from a micro-SD memory card. The module supports 4-bit ADPCM audio files (.ad4) with sample rates from 6kHz up to 32kHz. The compact 14-pin module takes up very minimal board space and is ideal for any application that requires embedded audio.
A free software tool, which can convert any WAVE(.wav) or MP3(.mp3) file to the ADPCM(.ad4), is linked below. The .ad4 file can be saved to a uSD card and playback can be controlled via one of two methods: serial or key.
The serial-mode provides a simple, 2-wire interface to any micro-controller via its DATA and CLK lines. Audio operations such as PLAY, PAUSE, STOP and VOLUME control functions are all available to the host micro via simple serial commands.
The key-mode provides a stand alone operation where a host micro is not required. With only 3 push buttons, a 3V battery and a speaker, an extremely compact and low component count MP3-Player like system can be implemented.
To give you an idea of what this module sounds like, we've recorded it playing some music. The first few seconds is a classic 8-bit tune to give you an idea of what this module does really well. The second clip is a few seconds of music to give you an idea of the performance you can expect. This all depends on what speakers you attach, the quality of your file, etc. But this should give you an idea. To hear it, click "Sound Demo" below.