1  # SPDX-FileCopyrightText: 2018 Kattni Rembor for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  import time
 6  import array
 7  import math
 8  import audiocore
 9  import board
10  import audiobusio
11  
12  tone_volume = 0.1  # Increase this to increase the volume of the tone.
13  frequency = 440  # Set this to the Hz of the tone you want to generate.
14  length = 8000 // frequency
15  sine_wave = array.array("h", [0] * length)
16  for i in range(length):
17      sine_wave[i] = int((math.sin(math.pi * 2 * i / length)) * tone_volume * (2 ** 15 -1))
18  
19  # For Feather M0 Express, ItsyBitsy M0 Express, Metro M0 Express
20  audio = audiobusio.I2SOut(board.D1, board.D0, board.D9)
21  # For Feather M4 Express
22  # audio = audiobusio.I2SOut(board.D1, board.D10, board.D11)
23  # For Metro M4 Express
24  # audio = audiobusio.I2SOut(board.D3, board.D9, board.D8)
25  sine_wave_sample = audiocore.RawSample(sine_wave)
26  
27  while True:
28      audio.play(sine_wave_sample, loop=True)
29      time.sleep(1)
30      audio.stop()
31      time.sleep(1)