The Gravity: MP3 Player Module by DFRobot offers a compact and efficient solution for adding audio playback to your Arduino projects. Equipped with 8MB onboard SPI flash memory, this MP3 player module supports high-quality MP3 and WAV formats and communicates seamlessly via UART interface. With 30 levels of volume adjustment, this audio module allows for precise sound control in 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 MP3 player module to a PC as a USB flash drive—no SD card needed. This plug-and-play feature makes it the perfect UART voice module for adding sound effects, prompts, or voice notifications in projects such as toys, alarms, timers, or Arduino-based systems. Whether you need a WAV player or a simple MP3 module, this Gravity series component ensures reliable performance. Key Features 8MB onboard storage: Integrated flash storage means no SD card required for your MP3 player module Supports MP3/WAV decoding: Versatile audio format support for clear sound output UART communication: Simple serial commands for easy Arduino integration Simulates USB flash drive: Hassle-free file management via USB input 30-step digital volume control: Fine-tune the audio levels of your voice module Compact design: Only 22 × 30 mm, ideal for small-scale Arduino MP3 projects Ideal for voice alerts, system prompts, educational devices, and UART-enabled audio projects Technical Specifications Parameter Value (MP3 Player Module) Operating Voltage 3.3V – 5V (Arduino Compatible) Interface Type UART (Serial Port Control) Supported 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 MP3 file updates Volume Adjustment 30 levels of digital control Dimensions 22 × 30 mm / 0.87 × 1.18 in Sound Channel Mono Output Comparison Table: MP3 Module Selection Guide Model Storage Channel USB Update Amp Audio Format Interface Dimensions DFPlayer Mini TF Card Mono No Yes MP3/WAV/WMA UART 20*20mm DFPlayer Pro 128MB Dual-Channel Yes Yes MP3/WAV/FLAC UART 23*24.5mm Gravity UART Module 8MB Flash Mono Yes No MP3/WAV UART 22*30mm Applications of the UART MP3 Module Audio prompts in embedded systems and industrial Arduino setups Talking toys, interactive gadgets, and educational robots Voice alarms, security notification systems, and smart timers Custom sound effects for interactive installations using UART control Voice-enabled Arduino projects requiring 8MB storage and USB updates Shipping List 1 × Gravity: UART MP3 Player Module (Voice Module) 1 × Gravity UART/I2C Sensor Cable (Compatible with Arduino) Reference Gravity MP3 Player Module Wiki
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