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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/

Preparing the RPi for I2C:

Open the file:

$ sudo nano /etc/modprobe.d/raspi-blacklist.conf

Comment out:

#blacklist i2c-bcm2708

Open the file:

$ sudo nano /etc/modules

Add:

i2c-dev

Load modules:

$ sudo modprobe i2c_bcm2708
$ sudo modprobe i2c-dev

Check the i2c modules:

$ lsmod

Library:
https://learn.adafruit.com/mcp230xx-gpio-expander-on-the-raspberry-pi/overview