Two parts
Part 1) Turn on in BIOS
http://www.raspberrypi-spy.co.uk/2014/11/enabling-the-i2c-interface-on-the-raspberry-pi/
sudo raspi-config
In the advanced settings turn on I2C
Now complete the following steps :
- Select “8 Advanced Options”
- Select “A7 I2C”
- Select “Yes”
The screen will ask if you want the interface to be enabled :
- Select “Yes”
- Select “Ok”
The screen will ask if you want the module to be loaded by default :
- Select “Yes”
The screen will state the module will be loaded by default :
- Select “Ok”
- Select “Finish” to return to the command line
When you next reboot the I2C module will be loaded.
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Part TWO - setup software
https://www.raspberrypi.org/forums/viewtopic.php?t=74763
Add this to /etc/modules and reboot
i2c-bcm2708
i2c-dev
sudo apt-get install python-smbus
sudo apt-get install i2c-tools
sudo i2cdetect -y 1
