Passive Buzzer

ブザーを鳴らす

gpio = 12
# 50%
Pigpiox.Pwm.hardware_pwm(gpio, 440, 500_000)

# 0%
Pigpiox.Pwm.hardware_pwm(gpio, 440, 0)

音階を鳴らす

codes = [
  131,
  147,
  165,
  175,
  196,
  211,
  248,
  262,
  294,
  330,
  350,
  393,
  441,
  495,
  525,
  589,
  661,
  700,
  786,
  882,
  990
]

scales = [7, 8, 9, 10, 11, 12, 13, 14]

beats = [1, 1, 1, 1, 1, 1, 1, 1]

scales
|> Enum.zip(beats)
|> Enum.map(fn {code_index, beat} ->
  code = Enum.at(codes, code_index)
  Pigpiox.Pwm.hardware_pwm(gpio, code, 500_000)
  Process.sleep(beat * 500)
end)

Pigpiox.Pwm.hardware_pwm(gpio, 440, 0)

ドレミの歌を演奏する

play = fn gpio, scales, beats ->
  scales
  |> Enum.zip(beats)
  |> Enum.map(fn {code_index, beat} ->
    code = Enum.at(codes, code_index)
    Pigpiox.Pwm.hardware_pwm(gpio, code, 500_000)
    Process.sleep(beat * 250)
  end)

  Pigpiox.Pwm.hardware_pwm(gpio, 440, 0)
end

scales = [7, 8, 9, 7, 9, 7, 9, 8, 9, 10, 10, 9, 8, 10]
beats = [2, 1, 2, 1, 2, 2, 4, 2, 1, 1, 1, 1, 1, 8]
play.(gpio, scales, beats)