DFPlayer Mini MP3 Player
Compact MP3/WAV/WMA playback module with onboard TF card slot (up to 32 GB), 3 W mono amplifier, and stereo DAC output. Controlled via serial UART from Arduino, ESP32, or similar. One of the most widely used embedded audio modules.
Pinout
- VCCleft side, pin 1 from top on the DFR0299 pin-map image
DC power input for the DFPlayer Mini module; official wiki specification lists DC3.2~5V.
Type · Power - RXleft side, pin 2 from top on the DFR0299 pin-map image
UART serial receive input used for microcontroller serial control.
Type · UART - TXleft side, pin 3 from top on the DFR0299 pin-map image
UART serial transmit output used for microcontroller serial control.
Type · UART - DAC_Rleft side, pin 4 from top on the DFR0299 pin-map image
Right-channel DAC / line-level stereo audio output for external amplifier or headphones.
Type · GPIO - DAC_Lleft side, pin 5 from top on the DFR0299 pin-map image
Left-channel DAC / line-level stereo audio output for external amplifier or headphones.
Type · GPIO - SPK_1left side, pin 6 from top on the DFR0299 pin-map image
One side of the direct speaker output driven by the built-in mono amplifier.
Type · Unknown - GNDleft side, pin 7 from top on the DFR0299 pin-map image
Ground reference for power, audio and signal interfaces.
Type · Ground - SPK_2left side, pin 8 from top on the DFR0299 pin-map image
Other side of the direct speaker output driven by the built-in mono amplifier.
Type · Unknown - BUSYright side, pin 1 from top on the DFR0299 pin-map image
Playback status output; used to indicate whether audio is currently playing.
Type · Unknown - USB-right side, pin 2 from top on the DFR0299 pin-map image
USB data minus connection exposed by the module.
Type · USB - USB+right side, pin 3 from top on the DFR0299 pin-map image
USB data plus connection exposed by the module.
Type · USB - ADKEY_2right side, pin 4 from top on the DFR0299 pin-map image
Analogue key input for AD key control mode.
Type · Analog - ADKEY_1right side, pin 5 from top on the DFR0299 pin-map image
Analogue key input for AD key control mode.
Type · Analog - IO_2right side, pin 6 from top on the DFR0299 pin-map image
Simple I/O control input for button-style playback control.
Type · GPIO - GNDright side, pin 7 from top on the DFR0299 pin-map image
Second ground pin on the module edge.
Type · Ground - IO_1right side, pin 8 from top on the DFR0299 pin-map image
Simple I/O control input for button-style playback control.
Type · GPIO
| Pin | Position | Type | Function |
|---|---|---|---|
| VCC | left side, pin 1 from top on the DFR0299 pin-map image | Power | DC power input for the DFPlayer Mini module; official wiki specification lists DC3.2~5V. |
| RX | left side, pin 2 from top on the DFR0299 pin-map image | UART | UART serial receive input used for microcontroller serial control. |
| TX | left side, pin 3 from top on the DFR0299 pin-map image | UART | UART serial transmit output used for microcontroller serial control. |
| DAC_R | left side, pin 4 from top on the DFR0299 pin-map image | GPIO | Right-channel DAC / line-level stereo audio output for external amplifier or headphones. |
| DAC_L | left side, pin 5 from top on the DFR0299 pin-map image | GPIO | Left-channel DAC / line-level stereo audio output for external amplifier or headphones. |
| SPK_1 | left side, pin 6 from top on the DFR0299 pin-map image | Unknown | One side of the direct speaker output driven by the built-in mono amplifier. |
| GND | left side, pin 7 from top on the DFR0299 pin-map image | Ground | Ground reference for power, audio and signal interfaces. |
| SPK_2 | left side, pin 8 from top on the DFR0299 pin-map image | Unknown | Other side of the direct speaker output driven by the built-in mono amplifier. |
| BUSY | right side, pin 1 from top on the DFR0299 pin-map image | Unknown | Playback status output; used to indicate whether audio is currently playing. |
| USB- | right side, pin 2 from top on the DFR0299 pin-map image | USB | USB data minus connection exposed by the module. |
| USB+ | right side, pin 3 from top on the DFR0299 pin-map image | USB | USB data plus connection exposed by the module. |
| ADKEY_2 | right side, pin 4 from top on the DFR0299 pin-map image | Analog | Analogue key input for AD key control mode. |
| ADKEY_1 | right side, pin 5 from top on the DFR0299 pin-map image | Analog | Analogue key input for AD key control mode. |
| IO_2 | right side, pin 6 from top on the DFR0299 pin-map image | GPIO | Simple I/O control input for button-style playback control. |
| GND | right side, pin 7 from top on the DFR0299 pin-map image | Ground | Second ground pin on the module edge. |
| IO_1 | right side, pin 8 from top on the DFR0299 pin-map image | GPIO | Simple I/O control input for button-style playback control. |
Pin details
16 connections- VCCleft side, pin 1 from top on the DFR0299 pin-map image
DC power input for the DFPlayer Mini module; official wiki specification lists DC3.2~5V.
Power - RXleft side, pin 2 from top on the DFR0299 pin-map image
UART serial receive input used for microcontroller serial control.
UART - TXleft side, pin 3 from top on the DFR0299 pin-map image
UART serial transmit output used for microcontroller serial control.
UART - DAC_Rleft side, pin 4 from top on the DFR0299 pin-map image
Right-channel DAC / line-level stereo audio output for external amplifier or headphones.
GPIO - DAC_Lleft side, pin 5 from top on the DFR0299 pin-map image
Left-channel DAC / line-level stereo audio output for external amplifier or headphones.
GPIO - SPK_1left side, pin 6 from top on the DFR0299 pin-map image
One side of the direct speaker output driven by the built-in mono amplifier.
Unknown - GNDleft side, pin 7 from top on the DFR0299 pin-map image
Ground reference for power, audio and signal interfaces.
Ground - SPK_2left side, pin 8 from top on the DFR0299 pin-map image
Other side of the direct speaker output driven by the built-in mono amplifier.
Unknown - BUSYright side, pin 1 from top on the DFR0299 pin-map image
Playback status output; used to indicate whether audio is currently playing.
Unknown - USB-right side, pin 2 from top on the DFR0299 pin-map image
USB data minus connection exposed by the module.
USB - USB+right side, pin 3 from top on the DFR0299 pin-map image
USB data plus connection exposed by the module.
USB - ADKEY_2right side, pin 4 from top on the DFR0299 pin-map image
Analogue key input for AD key control mode.
Analog - ADKEY_1right side, pin 5 from top on the DFR0299 pin-map image
Analogue key input for AD key control mode.
Analog - IO_2right side, pin 6 from top on the DFR0299 pin-map image
Simple I/O control input for button-style playback control.
GPIO - GNDright side, pin 7 from top on the DFR0299 pin-map image
Second ground pin on the module edge.
Ground - IO_1right side, pin 8 from top on the DFR0299 pin-map image
Simple I/O control input for button-style playback control.
GPIO
Start wiring
UART · I2S · Module
Confirm the data interface matches your host board.
Module pins: VCC, GND, RX, TX. Schematik maps them to your board in the app.
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