Create a campfire effect with a Circuit Playground Express. Copy a crackle.wav audio file for the sound effect, and toggle the switch to mute/unmute.

code.py

from time import sleep
from random import random
from board import SPEAKER, SLIDE_SWITCH, SPEAKER_ENABLE, NEOPIXEL
from neopixel import NeoPixel
from digitalio import DigitalInOut, Direction, Pull
from audioio import WaveFile
from audioio import AudioOut
from simpleio import map_range

# NeoPixels
pixels = NeoPixel(NEOPIXEL, 10, brightness=0.1, auto_write=False)

# Audio Speaker
speaker_enable = DigitalInOut(SPEAKER_ENABLE)
speaker_enable.direction = Direction.OUTPUT
speaker_enable.value = True
audio_clip = WaveFile(open("crackle.wav", "rb"))
speaker = AudioOut(SPEAKER)

# Toggle Switch
switch = DigitalInOut(SLIDE_SWITCH)
switch.direction = Direction.INPUT
switch.pull = Pull.UP

def audio_play():
    if not speaker.playing:
        speaker.play(audio_clip, loop=True)

def audio_stop():
    if speaker.playing:
        speaker.stop()

def animate_flame():
    for id in range(10):
        green = map_range(random(), 0.0, 1.0, 0, 96)
        pixels[id] = (255, int(green), 0)
    pixels.show()

while True:
    audio_play() if switch.value else audio_stop()
    animate_flame()
    sleep(0.1)