Prototypes
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* Prototype 1: 
  - Manufactured at ETSIT UPM University (Madrid, Spain)
  - Only two layers: bottom and top layers (No silkscreens).
  - Version for findings "bugs"
  - As this is a prototype manufactured in Spain, the notes
    are in Spanish

* Prototype 2:
  - Manufactured at pcbcart.com. This manufacturer told us 
    to modify the board because there were some tracks
    near the edges. We removed some tracks and re-route
    the tracks... but we forgot to route one track!!!
    Therefore this board has a bug :-(
    The manufacturer creates a panel of 10 boards.

* Prototype 3 (bugs-fixed)
  -This is a bug-fix release. It has not really been
   manufactured. It is similar to prototype 2 but with
   the bug fixed (and no panel).

   IF YOU ARE PLANNING TO MANUFACTURE THIS BOARD,
   YOU SHOULD USE THE GERBER FILES OF THE PROTOTYPE 3