The Gravity: MP3 Player Module offers a compact and efficient solution for adding audio playback to your projects. Equipped with 8MB onboard SPI flash memory, it supports MP3 and WAV formats and communicates via UART interface. With 30 levels of volume adjustment, it allows seamless audio control for a wide range of embedded applications.
Thanks to the built-in SPI FLASH-to-USB emulation, you can easily update audio files by connecting the module to a PC as a USB flash drive—no SD card needed. This makes it perfect for adding sound effects, prompts, or voice notifications in projects such as toys, alarms, timers, or Arduino-based systems.
Key Features
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8MB onboard storage, no SD card required
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Supports MP3/WAV decoding
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UART communication for easy integration
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Simulates USB flash drive for file updates
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30-step digital volume control
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Compact design: only 22 × 30 mm
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Ideal for voice alerts, system prompts, educational devices, and audio-enabled projects
Technical Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 3.3V – 5V |
| Interface | UART |
| Audio Format | MP3, WAV |
| Sampling Rate (kHz) | 8 / 11.025 / 12 / 16 / 22.05 / 24 / 32 / 44.1 / 48 |
| USB Simulation | SPI FLASH emulates U-disk for updates |
| Volume Adjustment | 30 levels |
| Dimensions | 22 × 30 mm / 0.87 × 1.18 in |
| Sound Channel | Mono |
Comparison Table: MP3 Module Selection Guide
| Model | Storage | Channel | USB Update | Amp | Audio Format | Interface | Dimentions |
|---|---|---|---|---|---|---|---|
| DFPlayer | TF Card | Mono | No | Yes | MP3/WAV/WMA | UART | 20*20mm/0.79*0.79" |
| DFPlayer Pro | 128MB | Dual-Channel | Yes | Yes | MP3/WAV/FLAC/AAC/APE | UART | 23*24.5mm/0.91*0.96" |
| Gravity UART Module | 8MB | Mono | Yes | No | MP3/WAV | UART | 22*30mm/0.87*1.81" |
Applications
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Audio prompts in embedded systems
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Talking toys and educational robots
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Voice alarms and notification systems
- Custom sound effects for interactive installations
Shipping List
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1 × Gravity: UART MP3 Voice Module
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1 × Gravity UART/I2C Sensor Cable