servo_test.rb

require 'artoo'

connection :arduino, adaptor: :firmata, port: '/dev/cu.usbmodem1421' # linux
device :board, :driver => :device_info
device :serv, :driver => :servo, :pin => 5 # pin must be a PWM pin

work do
  puts "Firmware name: #{board.firmware_name}"
  puts "Firmata version: #{board.version}"

  serv.move(0)# reset the position of the sweep (same as serv.min)

  every(3) do
    puts serv.current_angle
    serv.current_angle == 0 ? serv.move(10) : serv.move(0)
  end
end