* Ventilador: http://forum.fritzing.org/t/fan-ventilador-5v-download-piece/2096
  * Relays: https://timgolisch.wordpress.com/2015/02/22/fritzing-2-channel-relay-part/ https://github.com/rwaldron/fritzing-components
  * https://github.com/adafruit/Fritzing-Library/tree/master/parts
  * Otros: http://omnigatherum.ca/wp/?tag=fritzing
  * RF 433:https://github.com/coderfls/Fritzing-Parts