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-0

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.

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.