59 lines
1.7 KiB
Python
Executable file
59 lines
1.7 KiB
Python
Executable file
# SPDX-FileCopyrightText: 2022 John Park for Adafruit Industries
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# SPDX-License-Identifier: MIT
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# Convert files to appropriate WAV format (mono, 22050 Hz, 16-bit signed)
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import time
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import board
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import keypad
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import audiocore
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import audiomixer
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import audiobusio
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# wait a little bit so USB can stabilize and not glitch audio
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time.sleep(3)
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# list of (samples to play, mixer gain level)
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wav_files = (
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('wav/airhorn.wav', 1.0), #Honk sound 1
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('wav/bike-horn.wav', 1.0), #Honk around 2
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('wav/chime.wav', 1.0), #Honk sound 3
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('wav/idle.wav', 1.0) #Looping Engine Sound Effect
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)
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# pins used by keyboard
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KEY_PINS = (
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board.D5, board.D6, board.D12
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)
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km = keypad.Keys( KEY_PINS, value_when_pressed=False, pull=True)
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audio = audiobusio.I2SOut(board.TX, board.RX, board.D9)
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mixer = audiomixer.Mixer(voice_count=len(wav_files), sample_rate=22050, channel_count=1,
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bits_per_sample=16, samples_signed=True)
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audio.play(mixer) # attach mixer to audio playback
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for i in range(len(wav_files)): # start all samples at once for use w handle_mixer
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wave = audiocore.WaveFile(open(wav_files[i][0],"rb"))
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mixer.voice[i].play(wave, loop=True)
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mixer.voice[i].level = 0
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def handle_mixer(num, pressed):
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voice = mixer.voice[num] # get mixer voice
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if pressed:
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voice.level = wav_files[num][1] # play at level in wav_file list
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else: # released
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voice.level = 0 # mute it
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while True:
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mixer.voice[3].level = 1 #Looping Engine Sound Effect
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event = km.events.get()
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if event:
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if event.key_number < len(wav_files):
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if event.pressed:
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handle_mixer(event.key_number, True)
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if event.released:
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handle_mixer( event.key_number, False )
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