How to enable I2C on rpi3?

I’ve got an air quality sensor I would like to attach to the rpi3 running OSMC, however it looks like I2C is not enabled by default.

osmc@pi3:~$ i2cdetect -y 1
Error: Could not open file `/dev/i2c-1' or `/dev/i2c/1': No such file or directory

When running raspi-config it states to use MyOSMC, however I don’t see any I2C options in the GUI, I only see a checkbox for SPI.

How can I enable I2C?

Thanks

Hi,

If you add:

dtparam=i2c_arm=on

to:

/boot/config.txt

And reboot, you should be good.

Thanks Tom.

The My OSMC add-on has a config editor in the RPi section that allows entering other options in the GUI.

Seems to work, thanks!

osmc@pi3:~$ sudo i2cdetect -y 1
 0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

My sdcard broke and I had to use a backup from july 2019. I tried your suggestion again but without any luck this time…

osmc@SkyPi3:~$ cat /boot/config.txt
gpu_mem_1024=256
hdmi_ignore_cec_init=1
disable_overscan=1
start_x=1
disable_splash=1
gpu_mem_256=112
sdtv_aspect=1
gpu_mem_512=144
dtparam=i2c_arm=on
dtoverlay=gpio-ir,gpio_pin=18

osmc@SkyPi3:~$ sudo i2cdetect -y 1
Error: Could not open file `/dev/i2c-1' or `/dev/i2c/1': No such file or directory

I think I remember at some point I also tried changing the gpio pin functionality to i2c with a command but I can’t remember what that command was exactly. Any idea why it’s not working?

Have you rebooted after editing that config.txt

Yes of course :slight_smile:

Apparently i2c-dev module is not loaded at boot time, after running

sudo modprobe i2c-dev

It works. Weird!