Arduino - Enviando e recebendo dados com ruby

serial.rb

# Lennon Jesus - lennon d.o.t. jesus a.t. gmail d.o.t. com

require "serialport"

port_str = "/dev/ttyACM0"
baud_rate = 9600
data_bits = 8
stop_bits = 1
parity = SerialPort::NONE

sp = SerialPort.new(port_str, baud_rate, data_bits, stop_bits, parity)

index = 15

loop do
  sp.putc(index)
  puts 'Enviando: %d = %bb' % [ index, index ]
  index = (index == 15) ? 0 : (index + 1)
  sleep(1)
end

sp.close