Enable I2C and install tools on Raspberry Pi

To enable I2C and install tools on Raspberry Pi, such that you can develop program to communicate with I2C devices.

• $ sudo apt-get install i2c-tools
• $ sudo apt-get install libi2c-dev
• $ sudo nano /etc/modprobe.d/raspi-blacklist.conf
  comment the line of
  #blacklist i2c-bcm2708
• $ sudo nano /etc/modules
  add the lines:
  i2c-bcm2708
  i2c-dev
• reboot

After reboot, run i2c-tools to test

run the command with -1 option for rev 2 board, or -0 for rev 1 board.

$ sudo i2cdetect -y 1

$ sudo i2cdetect -y 0

updated@2016-06-21:
Enable I2C on Raspberry Pi running Raspbian Jessie

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Related:
- Communication between Raspberry Pi and Arduino via I2C, using Python.
- Raspberry Pi send block of data to Arduino using I2C.