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AUDIO (Usage on Raspberry Pi OS)

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

danger

The module must be connected before powering on to be properly recognized.

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.

AUDIO Operations