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Automation, sensing and robotics • Re: Using more than one I2C adapter at a time

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Yes, it is a Raspberry Pi 4.
Which sensor do you claim non-working correctly? From your above output - your sensors are on I2C-1 - only one of them is claimed by the kernel (0x68, that's why its address shows as 'UU').
Thanks. The one claimed by the kernel is the RTC.

I have removed the one which does not work when the others are present. It is the SEN-39003-R00 sensor for lightning, aka AS3935. I have it disconnected for the time being but if I recall correctly it uses the address 0x03, which is not in use by the others.

Is there a nice tutorial or guide somewhere? I need to retain the original, default I2C bus while adding a new one ... and then work around any GPIO conflicts. This board has lots of wiring attached and rewiring them will be a serious task.

Statistics: Posted by tpyo kingg — Mon Jul 28, 2025 9:37 am



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