Enabling i2c on Raspberry Pi 2
I’m currently taking a course on my university in embedded systems.
I needed an i2c interface, however, all guides for either Raspbian or Arch Linux (I’m using Arch) failed. After extensive googleing (I found out that searching for “Raspberry Pi 2” is hard) I finally found that a recent update to Raspberry Pi kernels and firmware changed how the Raspberry Pi manages it’s hardware. (Irritating, but it’s for the greater good. :) )
How to:
Please note that the instructions are for Arch Linux. However, step 1 should be identical regardless of OS. For instructions on other OSes, read the documentation. ;)
- Edit “/boot/config.txt”, append the line
dtparam=i2c_arm=on - Edit “/etc/modules-load.d/raspberrypi.conf”, append the line
12c-dev - Install i2c-tools and lm_sensors with Pacman
- Reboot the Raspberry Pi.
- List i2c interfaces with
ls /dev/i2c* - The i2c interface can later be used with other tools, such as i2cdetect. The
lsin step 5 will specify what bus number to be used with i2cdetect, typically 1 or 0
Refer to other guides on how to use i2c interface.
Have fun with i2c!
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