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3.1.3 Audio Module
Introduction
In this project, let’s make a DIY stereo with an audio power amplifier module, 8ohm/2w speakers and a 3.5mm Audio cable.
Required Components
In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:
Name |
ITEMS IN THIS KIT |
LINK |
---|---|---|
Raphael Kit |
337 |
You can also buy them separately from the links below.
COMPONENT INTRODUCTION |
PURCHASE LINK |
---|---|
- |
Experimental Procedures
Step 1: Build the circuit.

After building the circuit according to the above diagram, then plug the audio cable into the Raspberry Pi’s 3.5mm audio jack.

Step 2: Get into the folder of the code.
cd ~/raphael-kit/python/
Step 3: Run.
python3 3.1.3_AudioModule.py
After the code runs, you can enjoy the music.
Note
If your speaker have no sound, it may be because the Raspberry Pi has selected the wrong audio output (The default is HDMI), you need to Change Audio Output to Headphones.
If you feel that the volume of the speakers is too low, you can Adjust Volume.
Code
Note
You can Modify/Reset/Copy/Run/Stop the code below. But before that, you need to go to source code path like raphael-kit/python
. After modifying the code, you can run it directly to see the effect.
from pygame import mixer
import os
user = os.getlogin()
user_home = os.path.expanduser(f'~{user}')
mixer.init()
def main():
mixer.music.load(f'{user_home}/raphael-kit/music/my_music.mp3')
mixer.music.set_volume(0.7)
mixer.music.play()
while True:
pass# Don't do anything.
def destroy():
mixer.music.stop()
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
destroy()
Code Explanation
from pygame import mixer
mixer.init()
Import the mixer
method in the pygame
library and initialize the method.
mixer.music.load(f'{user_home}/raphael-kit/music/my_music.mp3')
mixer.music.set_volume(0.7)
mixer.music.play()
This code reads the my_music.mp3
file in the ~/raphael-kit/music
directory and sets the volume to 0.7(The range is 0~1).
The Raspberry Pi will start playing audio When mixer.music.play()
is called.
Note
You can also upload other music files to your Raspberry Pi. For a detailed tutorial, please refer to: Filezilla Software
mixer.music.stop()
Calling mixer.music.stop()
will stop playing audio.
In addition, you can also pause with mixer.music.pause()
and continue with mixer.music.unpause()
.