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Update CircuitPython_I2S_Tone.py #533

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Merged
merged 3 commits into from
Mar 6, 2019
Merged

Update CircuitPython_I2S_Tone.py #533

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67cff59
Update CircuitPython_I2S_Tone.py
papahabla Feb 25, 2019
b482400
Update CircuitPython_I2S_Tone.py
papahabla Feb 26, 2019
1cddf91
Update CircuitPython_I2S_Tone.py
papahabla Feb 26, 2019
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10 changes: 6 additions & 4 deletions Adafruit_MAX98357/CircuitPython_I2S_Tone.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,20 +5,22 @@
import board
import audiobusio

tone_volume = 0.1 # Increase this to increase the volume of the tone.
sample_rate = 8000
tone_volume = .1 # Increase or decrease this to adjust the volume of the tone.
frequency = 440 # Set this to the Hz of the tone you want to generate.
length = 8000 // frequency
length = sample_rate // frequency # One freqency period
sine_wave = array.array("H", [0] * length)
for i in range(length):
sine_wave[i] = int((1 + math.sin(math.pi * 2 * i / 18)) * tone_volume * (2 ** 15))
sine_wave[i] = int((math.sin(math.pi * 2 * frequency * i / sample_rate) *
tone_volume + 1) * (2 ** 15 - 1))

# For Feather M0 Express, ItsyBitsy M0 Express, Metro M0 Express
audio = audiobusio.I2SOut(board.D1, board.D0, board.D9)
# For Feather M4 Express
# audio = audiobusio.I2SOut(board.D1, board.D10, board.D11)
# For Metro M4 Express
# audio = audiobusio.I2SOut(board.D3, board.D9, board.D8)
sine_wave_sample = audioio.RawSample(sine_wave)
sine_wave_sample = audioio.RawSample(sine_wave, sample_rate=sample_rate)

while True:
audio.play(sine_wave_sample, loop=True)
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