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IP Selctor
MCP23008 and MCP23017
Configuration:
http://raspberrypi-aa.github.io/session3/i2c.html
http://www.gsurf.de/vorbereiten-des-raspberry-pi-auf-i2c/
Open the raspi-blacklist.conf:
sudo nano /etc/modprobe.d/raspi-blacklist.conf
Comment out:
#blacklist i2c-bcm2708
Library:
https://learn.adafruit.com/mcp230xx-gpio-expander-on-the-raspberry-pi/overview