Reply To: [Resolved]Unable to open I2C bus

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ok I got that to work now and can display un-calibrated plot graph.
when compiling compass_tutorial03.c after modifying calibration data I get error

pi@INS-RPi2-01 ~/BerryIMU/compass_tutorial03_calibration $ gcc -o compass_tutorial03 compass_tutorial03.c

/tmp/ccwU8pZV.o: In function `main’:
compass_tutorial03.c:(.text+0x354): undefined reference to `atan2′
collect2: ld returned 1 exit status

You were right though, it was just file name and paths incorrect.

Blip, blop, bloop…