See http://hardwareblacksmith.blogspot.com/ for details.
For used libraries/ideas please take a look here:
- http://skyduino.wordpress.com/librairie-arduino-pcf8574-pcf8575/
- http://starter-kit.nettigo.pl/2011/11/pcf8574-czyli-jak-latwo-zwiekszyc-liczbe-pinow-w-arduino/
As stated in the attached code:
- @author switch486
- @licensed under CC BY-SA
- NOTE - this (licence) does not consider the libraries 'included' in the classes made by the author