anchor.diff:  %%% @author Ivan Iacono <ivan.iacono@erlang-solutions.com> - Erlang Solutions Ltd
   %%% @copyright (C) 2013, Erlang Solutions Ltd
   %%% @doc Changes the brightness of led from the min value to the max value and
  -%%%      and come back.
  +%%% and come back.
   %%% @end
   
   -module(pwm_demo).
  
positive.code: 
  %% Change the value of the led from the max value to the min value
  fade_out(X) when X >= ?MIN_PWM ->
  	    pwm:value(X),
  	    timer:sleep(2),
  	    fade_out(X-1);
  fade_out(_X) ->
  
negative.code: 
  %% Initialize the PWM peripheral
  init() ->
      pwm_sup:start_link([{pwm1, "/dev/pwm1"}]).
  
  %% Run the demo
  start() ->
  