0a2b0d3d51
Changed the array type to allow I2S signed values. Eliminated the baseline in the ``math.sin`` portion of the code. Updated the calculated value range to represent a maximum value of 32767 rather than 32678 to avoid distortion caused by value wrap-around.
27 lines
857 B
Python
Executable file
27 lines
857 B
Python
Executable file
import time
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import array
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import math
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import audioio
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import board
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import audiobusio
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tone_volume = 0.1 # Increase this to increase the volume of the tone.
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frequency = 440 # Set this to the Hz of the tone you want to generate.
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length = 8000 // frequency
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sine_wave = array.array("h", [0] * length)
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for i in range(length):
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sine_wave[i] = int((math.sin(math.pi * 2 * i / length)) * tone_volume * (2 ** 15 -1))
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# For Feather M0 Express, ItsyBitsy M0 Express, Metro M0 Express
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audio = audiobusio.I2SOut(board.D1, board.D0, board.D9)
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# For Feather M4 Express
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# audio = audiobusio.I2SOut(board.D1, board.D10, board.D11)
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# For Metro M4 Express
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# audio = audiobusio.I2SOut(board.D3, board.D9, board.D8)
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sine_wave_sample = audioio.RawSample(sine_wave)
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while True:
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audio.play(sine_wave_sample, loop=True)
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time.sleep(1)
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audio.stop()
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time.sleep(1)
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