Enabling i2c node in Node Red to access /dev/i2c-0

[etherlon]

Hi All,

Have a problem where Node Red is saying - Error: EPERM: operation not permitted, open ‘/dev/i2c-0’ when using the node-red-contrib-i2c node. From what I have been able to work out, the issue is the Node Red docker container can’t access the hardware because it doesn’t have permission to do so. The device driver for i2c is in the /dev directory on the RPi4 I’m using (got the driver enabled by using the i2c addon). I started looking into adding the permission to the Node Red config.yaml to access i2c but can’t find it anywhere (and I don’t know if that is the right way to go about it anyway).

Can anyone help?

[lukewest]

I also have this problem.

I followed this from Adam Outler

[add-on] HassOS I2C Configurator

HassOS I2C Configurator [image] This project enables the Raspberry Pi I2C bus from an addon. You can connect an SDCard and up to two hard disks or USB drives, which are detected as sda or sdb, and they will all have I2C enabled when you click start. About This project is a part of my HassOS Configurator project. The goal of this add-on, similar to root apps on Android, is to make a mole-hill out of a mountain. Installation Within Home Assistant, click Supervisor-> Add-on Store → … button (…

(note you need to read the installation instructions and make it run Protection mode = OFF)

The permissions on my pi (3) are:
[core-ssh ~]$ ls -l /dev/i2c-1 crw------- 1 root root 89, 0 Mar 11 07:33 /dev/12c-1

The file is a character special file (the leading c) then rw for root only. I’m looking at how to mod this.

[seanorsomeone (Sean Read)]

I have the very same issue!

Error: EPERM: operation not permitted, open ‘/dev/i2c-1’

[Crashdown1977]

Hallo

Same problem by me.
Can someone help?

Das gleiche Problem bei mir!
Kann hier jemand helfen?
Thanks/Danke

[V4l3n10]

I have the same issue. Any luck?