Features​

• Do not plug or unplug any device interfaces other than the audio interface while powered on
• Uses the DA7212 professional stereo codec chip, controlled via I2C interface and transmitting audio via I2S
• Onboard standard 3.5mm headphone jack for playing music with external headphones
• Onboard AUX input interface for easy connection to other devices
• Onboard speaker screw terminal and a PH2.0 dual‑channel speaker connector, offering multiple interface types for a wider range of usage scenarios
• Onboard dual microphones for recording without additional external devices
• Onboard programmable button and indicators for custom functions
• Supports sampling frequency up to 96KHz
• Supports up to 24-bit resolution audio data

Dimensions​

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This section describes how to use GPIO to drive audio functions on the Raspberry Pi, laying the foundation for subsequent project development.

AUDIO Operations​

Check Audio Devices​

• Check currently recognized audio playback devices

  aplay -l
  

Audio Playback​

• Play the audio file test.wav (using the corresponding device; here the recognized audio device is hardware sound card number 2). Ensure the test.wav file exists in the current directory.

  aplay -D plughw:2 test.wav
  
• The speaker or headphones will then play the audio

alsamixer Audio Configuration​

• Open the alsamixer audio configuration tool

  sudo alsamixer
  
• If the sound card is not set as the default, press F6 to select the sound card device. 
• Use the left/right arrow keys to select functions and the up/down arrow keys to adjust the corresponding volume.

Play MP3​

• aplay only supports WAV audio. In practice, MP3 format audio is more common. Install the mpg123 playback tool.

  sudo apt-get install mpg123 
  
• Play the music.mp3 audio file. Ensure the music.mp3 file exists in the current directory.

  sudo mpg123 music.mp3
  

Graphical Configuration​

• Install the graphical audio control tool smplayer

  sudo apt-get install smplayer
  
• Right-click in the interface and select IOaudIODAC as the default.

   

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1. Hardware Resources​

• Development Board Design File
  • Schematic
• Dimension Drawings
  • 3D Drawing