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I now have it working reliably, it seems: I used a 4-strand shielded cable (grounded on one side) for the power/I2C connection. This does not seem to be an issue anymore somehow; the example sketch from Adafruit seems to handle the I2C command reset.

Thanks for checking again, that makes sense and is very helpful. I will try and connect the BNO with a longer cable and see if the problem persists. The first setup that reproduced the problem was with a Teensy stacked on the Audioshield, and the BNO in roughly the same distance as on your...

Hi again, I just tested the setup with the BNO055 connected through a PCA9548A 8-Ch I²C multiplexer, but the issue persists. It seems that the BNO crashes when the MCLK is clocking, we hypothesize it may be a timing issue caused in the Teensy's I²C/I²S hardware.

The photo was just for illustration, the problems occur of course also with only one board connected. Output of the rawdata sketch when it happens: I only built up a second audio board to verify it was not the specific hardware, the error is the same on both, and also on both custom pcbs...

Oh, and I did try a lower I2C clock briefly at some point.

Thank you for looking into this! Fresh Arduino+ Latest Teensyduino and Adafruit Libs, same results. Breadboard; with the two audio boards; the lego brick is the proximity sensor and can swap out for a custom BNO module. Second audio board, only modifications shown, connects SDA/SCL/3V3/GND...

I found this reference: https://forums.adafruit.com/viewtopic.php?f=19&t=125734 I tried this on a regular Audio Board, but I2C stops working (at least with the proximity sensor). PaulStoffregen, could you imagine a test setup that would allow us to better debug this? We did not see anything...

Of course. I am using Wire.h. I wanted to try some options of i2c_t3 and also replaced the includes in the library, but both libraries result in the same problem.

Reviving this thread as we have the exact same issue here and we can not find a solution after days of debugging. We have made a custom PCB with one BNO055 (0x28 address) and two SGTL5000 chips for quad channel output. Audio output and BNO055 they work fine individually, but when the MCLK starts...