Speaker

The StudioBot is equiped with a basic speaker. This is suitable for playing simple sounds and complex sounds that come from an MP3 source.

Basic Sounds

The most basic sounds can be a simple tone.

import board
import simpleio

simpleio.tone(board.DAC, 440, duration=1.0)

We can make tones from the speaker

from audiocore import RawSample
from audioio import AudioOut
import board
import time
import audiobusio
import array
import math

tone_volume = 0.1  # Increase this to increase the volume of the tone.
frequency = 440  # Set this to the Hz of the tone you want to generate.
length = 8000 // frequency
sine_wave = array.array("H", [0] * length)
for i in range(length):
    sine_wave[i] = int((1 + math.sin(math.pi * 2 * i / length)) * tone_volume * (2 ** 15 - 1))
    
audio = AudioOut(board.DAC)
sine_wave_sample = RawSample(sine_wave)
audio.play(sine_wave_sample, loop=True)
time.sleep(1) #how long we want to play the sound for
audio.stop()

MP3 Files

Our Robot can actually play MP3 files

import board
import digitalio

from audiomp3 import MP3Decoder

try:
    from audioio import AudioOut
except ImportError:
    try:
        from audiopwmio import PWMAudioOut as AudioOut
    except ImportError:
        pass  # not always supported by every board!

button = digitalio.DigitalInOut(board.SWITCH1)
button.switch_to_input(pull=digitalio.Pull.UP)

# The listed mp3files will be played in order
mp3files = ["begins.mp3"]

# You have to specify some mp3 file when creating the decoder
mp3 = open(mp3files[0], "rb")
decoder = MP3Decoder(mp3)
audio = AudioOut(board.DAC)

while True:
    for filename in mp3files:
        # Updating the .file property of the existing decoder
        # helps avoid running out of memory (MemoryError exception)
        decoder.file = open(filename, "rb")
        audio.play(decoder)
        print("playing", filename)

        # This allows you to do other things while the audio plays!
        while audio.playing:
            pass

        print("Waiting for button press to continue!")
        while button.value:
            pass

Further examples and information can be found in this Adafruit article.