The DFPlayer Mini MP3 Player Module is a compact, low-cost audio playback solution designed for embedded systems. It supports direct playback of MP3 and WAV files from a micro SD card and can be controlled via UART serial commands or simple push buttons. With a built-in audio decoder and onboard amplifier support, it is ideal for voice alerts, sound effects, toys, and IoT audio projects.
Core Module Specifications
• Audio Decoder: Integrated MP3 / WAV decoder
• Storage Support: Micro SD / TF card
• Control Methods: UART serial commands, I/O button control
• Audio Output: DAC line-out and speaker output
Electrical & Interface
• Operating Voltage: 3.2 V – 5 V
• Communication Interface: UART (TX, RX)
• Baud Rate: 9600 bps (default)
• Interface Pins: VCC, GND, TX, RX, SPK+, SPK−
• Speaker Support: External speaker via amplifier output
Performance Characteristics
• Supports MP3 and WAV audio formats
• Stable playback with low power consumption
• Fast response to serial commands
• Volume control via software commands
Physical Characteristics
• Module Type: PCB-mounted MP3 player module
• Form Factor: Ultra-compact design
• Onboard Components: Audio decoder IC and support circuitry
• Lightweight and easy to integrate
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32
• STM32, AVR, PIC microcontrollers
• Raspberry Pi (UART control)
Key Advantages
• No external audio decoder required
• Simple serial control interface
• Supports standalone and MCU-controlled operation
• Widely used with strong community support
Technical Insights
• Audio files must be named correctly for indexing
• Uses FAT16 / FAT32 formatted micro SD cards
• External amplifier improves sound output quality
• Grounding quality affects audio noise performance
Applications
• Voice announcement systems
• Talking robots and toys
• Alarm and notification devices
• IoT audio feedback systems
• DIY embedded sound projects
Pro Tip
• Use a dedicated power supply for clean audio
• Format SD card to FAT32 before use
• Add a small amplifier for louder output
• Keep audio signal wires short to reduce noise
Package Includes
• 1 × DFPlayer Mini MP3 Player Module