DFPlayer Mini MP3 Player Module — TF Card and Serial Control
The DFPlayer Mini is a compact MP3 decoder that plays audio files from a micro SD card independently of a microcontroller, or under serial UART control from an Arduino or ESP32. Files are stored as numbered MP3 or WAV files on the SD card; the Arduino sends single-byte commands over software or hardware serial to play, pause, skip, or set volume. A built-in 3W mono amplifier drives a speaker directly without a separate amplifier board.
- Plays MP3 and WAV files from micro SD card (up to 32GB)
- UART control — play, stop, volume, track select via serial commands
- Built-in 3W amplifier — drives 4–8 ohm speakers directly
- Standalone mode — plays next track on button press without MCU
- 3.2V–5V supply — compatible with Arduino and ESP32
- Line-out pins — connects to external amplifier for higher power
| Specification | Value |
|---|---|
| Supported formats | MP3, WAV |
| Storage | Micro SD, FAT16/FAT32, up to 32GB |
| Amplifier power | 3W (mono) |
| Speaker impedance | 4 – 8 ohm |
| Control interface | UART serial (9600 baud) |
| Supply voltage | 3.2V – 5V |
| DAC output | 24-bit, 8–48kHz sample rate |
How do you play a specific track from Arduino?
Name files as 0001.mp3, 0002.mp3 etc. in the root of the SD card. Use SoftwareSerial on pins 10/11 and the DFRobotDFPlayerMini library from the Library Manager. Call myDFPlayer.play(1) to play track 1. The module responds with a serial acknowledge byte when the command is received.
Does the 3W amplifier output sound well enough for a small speaker?
Yes. At 5V supply, 3W into a 4-ohm 50mm speaker produces clearly audible audio for notifications, voice announcements, and short sound effects. For background music in a room-sized project, add an external 10W–30W amplifier board on the DAC line-out pins.
Best for
Arduino doorbell sound effects, voice announcement systems, haunted house audio triggers, robotics speech modules, alarm sound boards, interactive exhibit audio, retro arcade sound effects, and any project needing triggered audio playback without a Raspberry Pi.
Why Kunkune
Shipped from UK stock. 60-day returns, no minimum order. Fast Royal Mail delivery.
Audio files are stored on a micro SD card — the micro SD card module is available separately if you need one for another project.
Buying in bulk? For orders of 10+ units, contact us for trade pricing.
