audioio module contains classes to provide access to audio IO.
All classes change hardware state and should be deinitialized when they
are no longer needed if the program continues after use. To do so, either
deinit() or use a context manager. See
Lifetime and ContextManagers for more info.
For more information on working with this module, refer to the CircuitPython Essentials Learn Guide.
Available on these boards
- class audioio.AudioOut(left_channel: microcontroller.Pin, *, right_channel: microcontroller.Pin | None = None, quiescent_value: int = 32768)¶
Output an analog audio signal
Create a AudioOut object associated with the given pin(s). This allows you to play audio signals out on the given pin(s).
Simple 8ksps 440 Hz sin wave:
import audiocore import audioio import board import array import time import math # Generate one period of sine wav. length = 8000 // 440 sine_wave = array.array("H",  * length) for i in range(length): sine_wave[i] = int(math.sin(math.pi * 2 * i / length) * (2 ** 15) + 2 ** 15) dac = audioio.AudioOut(board.SPEAKER) sine_wave = audiocore.RawSample(sine_wave, sample_rate=8000) dac.play(sine_wave, loop=True) time.sleep(1) dac.stop()
Playing a wave file from flash:
import board import audioio import digitalio # Required for CircuitPlayground Express speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE) speaker_enable.switch_to_output(value=True) data = open("cplay-5.1-16bit-16khz.wav", "rb") wav = audiocore.WaveFile(data) a = audioio.AudioOut(board.A0) print("playing") a.play(wav) while a.playing: pass print("stopped")
- __exit__() None ¶
Automatically deinitializes the hardware when exiting a context. See Lifetime and ContextManagers for more info.
- play(sample: circuitpython_typing.AudioSample, *, loop: bool = False) None ¶
Plays the sample once when loop=False and continuously when loop=True. Does not block. Use
The sample itself should consist of 16 bit samples. Microcontrollers with a lower output resolution will use the highest order bits to output. For example, the SAMD21 has a 10 bit DAC that ignores the lowest 6 bits when playing 16 bit samples.
- pause() None ¶
Stops playback temporarily while remembering the position. Use
resumeto resume playback.