Meine Vermutung bzgl. BUFFER_LENGTH in https://www.roboternetz.de/community...l=1#post647107 war doch richtig, allerdings muss das neue #ifndef... in die i2clib, nicht in den Code:
Arduino\portable\libraries\I2Cdev\I2Cdev.cpp
Lines 90 to 93 in I2Cdev.cpp
#ifndef BUFFER_LENGTH
// band-aid fix for platforms without Wire-defined BUFFER_LENGTH (removed from some official implementations)
#define BUFFER_LENGTH 32
#endif
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