Contents

#
# Example of playing a melody on a piezoelectric buzzer.
#
require 'bundler/setup'
require 'denko'

board = Denko::Board.new(Denko::Connection::Serial.new)
buzzer = Denko::PulseIO::Buzzer.new(board: board, pin: 9)

C4 = 262
D4 = 294
E4 = 330

notes = [
        [E4, 1], [D4, 1], [C4, 1], [D4, 1], [E4, 1], [E4, 1], [E4, 2],
        [D4, 1], [D4, 1], [D4, 2],          [E4, 1], [E4, 1], [E4, 2],
        [E4, 1], [D4, 1], [C4, 1], [D4, 1], [E4, 1], [E4, 1], [E4, 1], [E4, 1],
        [D4, 1], [D4, 1], [E4, 1], [D4, 1], [C4, 4],
        ]
        
bpm = 240
beat_time = 60.to_f / bpm

notes.each do |note|
  buzzer.tone(note[0])
  sleep note[1] * beat_time
end

buzzer.stop
board.finish_write

Version data entries

6 entries across 6 versions & 1 rubygems

Version	Path
denko-0.13.6	examples/pulse_io/buzzer.rb
denko-0.13.5	examples/pulse_io/buzzer.rb
denko-0.13.4	examples/pulse_io/buzzer.rb
denko-0.13.3	examples/pulse_io/buzzer.rb
denko-0.13.1	examples/pulse_io/buzzer.rb
denko-0.13.0	examples/pulse_io/buzzer.rb