4 Risorse utili per le lezioni su Arduino.
9 - http://arduino.cc/en/Reference/HomePage
14 - http://playground.arduino.cc/Code/DatatypePractices
15 - https://learn.sparkfun.com/tutorials/data-types-in-arduino
21 - https://learn.adafruit.com/adafruit-arduino-lesson-13-dc-motors/transistors