Gravity: MP3 Player Module with 8MB Storage (UART, Mono)

The Gravity: MP3 Player Module is a compact audio playback board featuring 8MB of onboard flash storage, an integrated mono amplifier, and a straightforward UART serial interface. Designed for seamless compatibility with Arduino and other microcontrollers, it provides an easy way for students, makers, and educators to incorporate audio alerts and sound effects. Its wide 3.3V to 5V operating range and standard Gravity connector make wiring fast and beginner-friendly.

Onboard 8MB flash storage

The module is equipped with 8MB of flash storage to hold sound clips and voice tracks. It can emulate a standard USB flash drive, allowing you to update audio files quickly via simple drag-and-drop file transfers.

MP3 and WAV hardware decoding

Dedicated hardware decoding supports both MP3 and WAV formats with sampling rates ranging from 8kHz to 48kHz. This offloads audio processing from the host microcontroller to ensure smooth, reliable playback.

UART control with 30 volume levels

Audio playback and configuration are controlled over a serial UART interface. The integrated mono amplifier features 30 discrete volume adjustment levels to tailor output sound levels to your project environment.

Compact form factor and applications

Measuring only 22x30mm, this module fits neatly into small enclosures and portable builds operating at 3.3V to 5V. It is well-suited for adding voice prompts to toys, medication reminders, timers, and interactive alarms.

Included Gravity sensor cable

The package includes a dedicated Gravity UART/I2C sensor cable alongside the MP3 module. This plug-and-play wiring connection prevents wiring errors and speeds up prototyping.

Downloads & documentation

• Product wiki (DFRobot)