DFPlayer Mini MP3 Module

Overview

The DFPlayer Mini is a small, low-cost MP3/WAV/WMA audio playback module with a built-in amplifier that can directly drive a 3W speaker. It reads audio files from a microSD card and is controlled via UART serial, making it extremely easy to integrate with Arduino, ESP32, Raspberry Pi, and other microcontrollers.

Key Specifications

Parameter	Value
Operating Voltage	3.2V - 5V DC
Audio Formats	MP3, WAV, WMA
DAC	24-bit, 90dB dynamic range, 85dB SNR
Sampling Rates	8/11.025/12/16/22.05/24/32/44.1/48 kHz
MicroSD Support	Up to 32GB (FAT16/FAT32)
File Organization	Up to 100 folders, 255 songs per folder
Speaker Output	3W direct drive
Volume Levels	30 levels
Equalizer	6 presets
Control Interface	UART (9600 bps), I/O mode, AD key mode
Dimensions	20 x 20 mm
Weight	20g

Features

• 24-bit DAC with high signal-to-noise ratio
• 30-level volume control and 6-band equalizer
• Three control modes: UART serial, direct I/O buttons, analog key input
• Advertising sound insertion — pause music, play announcement, resume
• Supports up to 100 folders with 255 tracks each
• Built-in 3W amplifier — no external amp needed for small speakers
• DAC output for connecting to external amplifiers or headphones

Getting Started

Insert a microSD card with MP3 files, connect TX/RX to your microcontroller's serial pins, and use the DFPlayer Mini Arduino library for easy playback control.