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IP Selctor with the MCP23008 and MCP23017
Preparing the RPi for I2C:
http://raspberrypi-aa.github.io/session3/i2c.html
http://www.gsurf.de/vorbereiten-des-raspberry-pi-auf-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 Module Size Used by i2c_dev 3792 0 i2c_bcm2708 3408 0
Install some programs:
$ sudo apt-get update $ sudo apt-get install i2c-tools $ sudo apt-get install python-smbus
Check the address:
$ sudo i2cdetect -y 1 $ sudo i2cdump -y 1 0x20
Library:
https://learn.adafruit.com/mcp230xx-gpio-expander-on-the-raspberry-pi/overview
Download Adafruit libraries:
$ wget https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code/archive/master.zip
unpack:
$ unzip master.zip