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Node-Red, Sensor Init Failed (i2c-1 error)

  • Hello, good day.

    I'm trying to get sensor(bme280) in node-red. I installed bme280 node and ı got i2c-1 error.

    "Sensor Init failed ->Error: ENOENT: no such file or directory, open '/dev/i2c-1'"

    I search onion docs and found that i2c-0 comes default in device. How do ı set this i2c-1 ? or how do ı show my flow i2c-0alt text

  • @boraertn I don't have experience with Node Red, but I would expect it has a mechanism for device discovery and/or mapping. This is where I would first look.

    For a work around to possibly get you up and running before you find the proper solution.

    ln -s /dev/i2c-0 /dev/i2c-1

    This create a symlink to the device.

    You may need to run this each time you restart, so it would be better to put this into a hotplug script. Take a look at this link for more info: https://openwrt.org/docs/guide-user/base-system/hotplug

    It's a a hack, not a good solution, but in the absence of better advice you could try this for short term solution to get you going.

  • Hello @crispyoz thank you for answer. thats solve my problem but temporary.

    But ı found solution permanent. If bme280 connect correct in omega device and if you install packages i2c packages.

    in the node-red flow just click your bme280 and change bus 1 to 0. That will change to i2c-0 permanent.

    how to know bme280 connect correct in omega device ?

    in terminal write i2cdetect -y 0 if you see 76/77 that's means you connect correct.

  • If you installed node-red-contrib-bme280 in the config window just change bus# to 0 and it should work. I noticed that i have to reboot each time a new node is installed to see it or make it work.


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