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13. Play Music and Sound Effects

In this project, you will learn how to make the PiCar-X play background music or sound effects. You can also play music files that you have stored.

Before You Start

Make sure you‘ve completed:

• Install All the Modules (Important) — Install robot-hat, vilib, picar-x modules, then run the script i2samp.sh.

Run the Code

cd ~/picar-x/example
sudo python3 13.sound_background_music.py

After the code runs, please operate according to the prompt that printed on the terminal.

Input key to call the function!

• space: Play sound effect (Car horn)

• c: Play sound effect with threads

• q: Play/Stop Music

Code

from time import sleep
from picarx.music import Music
import readchar

music = Music()

manual = '''
Input key to call the function!
    space: Play sound effect (Car horn)
    c: Play sound effect with threads
    q: Play/Stop Music
'''

def main():
    print(manual)

    flag_bgm = False
    music.music_set_volume(20)


    while True:
        key = readchar.readkey()
        key = key.lower()
        if key == "q":
            flag_bgm = not flag_bgm
            if flag_bgm is True:
                music.music_play('../musics/slow-trail-Ahjay_Stelino.mp3')
            else:
                music.music_stop()

        elif key == readchar.key.SPACE:
            music.sound_play('../sounds/car-double-horn.wav')
            sleep(0.05)

        elif key == "c":
            music.sound_play_threading('../sounds/car-double-horn.wav')
            sleep(0.05)


if __name__ == "__main__":
    main()

How it works?

Functions related to background music include these:

• music = Music() : Declare the object.

• music.music_set_volume(20) : Set the volume, the range is 0~100.

• music.music_play('../musics/slow-trail-Ahjay_Stelino.mp3') : Play music files, here is the slow-trail-Ahjay_Stelino.mp3 file under the ../musics path.

• music.music_stop() : Stop playing background music.

Note

You can add different sound effects or music to musics or sounds folder via FileZilla Software.