The simple instruction for enabling I2C interface in Raspberry Pi (Rasbian).
I2C (or IIC) is a universal bidirectional bus. I2C is common standard designed to allow one device communicate with another.
The bus can connect multiple devices, each device has an unique address to distinguish them.
Raspberry Pi supports I2C, but it’s disabled by default in Rasbian.
So here is steps for configuring I2C.
Enable kernel modules for I2C
sudo echo "i2c-bcm2708" >> /etc/modules sudo echo "i2c-dev" >> /etc/modules
Remove enabled modules from kernel black list. Open file
sudo nano /etc/modprobe.d/raspi-blacklist.conf
and comment out the lines below:
#blacklist spi-bcm2708 #blacklist i2c-bcm2708
.. by putting a # in front of them. Save file.
Install I2C tools and Python library
Install following packages from default repositories
sudo apt-get install python-smbus sudo apt-get install i2c-tools
Check connected devices
Use following commnd for Raspberry Pi Model B:
sudo i2cdetect -y 1
And for Raspberry Pi Model A:
sudo i2cdetect -y 0
It shows that an one I2C address is in use - 0x77. So you can use it for communication with I2C device.
Now your Pi is ready to use I2C devices.