Copy the Code and Libraries
You need to copy the code and all of the necessary libraries to your Feather.
Thankfully, we can do this in one go. In the example below, click the Download Project Bundle button below to download the necessary libraries and the code.py file in a zip file. Extract the contents of the zip file, and copy the entire sounds folder and the code.py file to your CIRCUITPY drive.
Your CIRCUITPY drive should contain the following files and folders.
# SPDX-FileCopyrightText: 2023 Phil Burgess for Adafruit Industries
#
# SPDX-License-Identifier: MIT
"""
HAL 9000 demo project for Adafruit Prop Maker Feather RP2040 and "Massive
Arcade Button with LED - 100mm red." This simply monitors for button presses
and then randomly plays one WAV file from the CIRCUITPY filesystem.
No soldering required; using quick-connects, LED and button can be wired
to screw terminals on the Prop Maker Feather board.
NOTE: WAV FILES MUST BE 16-BIT. This will be fixed (allowing 8-bit WAVs if
desired) in CircuitPython 9.0.
"""
# pylint: disable=import-error
import os
import random
import time
import audiocore
import audiobusio
import board
import digitalio
import pwmio
# HARDWARE SETUP -----------------------------------------------------------
# LED+ is wired to "Neo" pin on screw terminal header, LED- to GND.
# The LED inside the button is NOT a NeoPixel, just a normal passive LED,
# but that's okay here -- the "Neo" pin can also function like a simple
# 5V digital output or PWM pin.
led = pwmio.PWMOut(board.EXTERNAL_NEOPIXELS)
led.duty_cycle = 65535 # LED ON by default
# Button is wired to GND and "Btn" on screw terminal header:
button = digitalio.DigitalInOut(board.EXTERNAL_BUTTON)
button.direction = digitalio.Direction.INPUT
button.pull = digitalio.Pull.UP
# Enable power to audio amp, etc.
external_power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
external_power.direction = digitalio.Direction.OUTPUT
external_power.value = True
# I2S audio out
audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
# Find all Wave files in CIRCUITPY storage:
wavefiles = [
file
for file in os.listdir("/sounds/")
if (file.endswith(".wav") and not file.startswith("._"))
]
print("Audio files found:", wavefiles)
# FUNCTIONS ----------------------------------------------------------------
def play_file(filename):
"""Plays a WAV file in its entirety (function blocks until done)."""
print("Playing", filename)
with open(f"/sounds/{filename}", "rb") as file:
audio.play(audiocore.WaveFile(file))
# Randomly flicker the LED a bit while audio plays
while audio.playing:
led.duty_cycle = random.randint(5000, 30000)
time.sleep(0.1)
led.duty_cycle = 65535 # Back to full brightness
# MAIN LOOP ----------------------------------------------------------------
# Loop simply watches for a button press (button pin pulled to GND, thus
# False) and then plays a random WAV file. Because the WAV-playing function
# will take a few seconds, this doesn't even require button debouncing.
while True:
if button.value is False:
play_file(random.choice(wavefiles))
Audio Files
The included wav audio files were generated using the text to speech feature in macOS. To create your own, reference this learn guide.
The format of the audio file should be:
- .Wav File format – 16-bit integer (Little Endian)
- Mono, 22.050 kHz
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