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.
DC power input for the DFPlayer Mini module; official wiki specification lists DC3.2~5V.
UART serial receive input used for microcontroller serial control.
UART serial transmit output used for microcontroller serial control.
Right-channel DAC / line-level stereo audio output for external amplifier or headphones.
Left-channel DAC / line-level stereo audio output for external amplifier or headphones.
One side of the direct speaker output driven by the built-in mono amplifier.
Ground reference for power, audio and signal interfaces.
Other side of the direct speaker output driven by the built-in mono amplifier.
Playback status output; used to indicate whether audio is currently playing.
USB data minus connection exposed by the module.
USB data plus connection exposed by the module.
Analogue key input for AD key control mode.
Analogue key input for AD key control mode.
Simple I/O control input for button-style playback control.
Second ground pin on the module edge.
Simple I/O control input for button-style playback control.
| 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. |
DC power input for the DFPlayer Mini module; official wiki specification lists DC3.2~5V.
UART serial receive input used for microcontroller serial control.
UART serial transmit output used for microcontroller serial control.
Right-channel DAC / line-level stereo audio output for external amplifier or headphones.
Left-channel DAC / line-level stereo audio output for external amplifier or headphones.
One side of the direct speaker output driven by the built-in mono amplifier.
Ground reference for power, audio and signal interfaces.
Other side of the direct speaker output driven by the built-in mono amplifier.
Playback status output; used to indicate whether audio is currently playing.
USB data minus connection exposed by the module.
USB data plus connection exposed by the module.
Analogue key input for AD key control mode.
Analogue key input for AD key control mode.
Simple I/O control input for button-style playback control.
Second ground pin on the module edge.
Simple I/O control input for button-style playback control.
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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