I recently bought an arudion uno and few sensors for my project and I have problem with one of these: MPU6050.
I downloaded library for this sensor from http://www.i2cdevlib.com and uploaded sketch with demonstrates dmp usage.
Link to the sketch: https://github.com/jrowberg/i2cdevlib/blob/master/Arduino/MPU6050/Examples/MPU6050_DMP6/MPU6050_DMP6.ino
When I uncommented OUTPUT_READABLE_REALACCEL and tried to get acceleration without gravity I got strange values from z-axis. It's look like that after ~10s x and y axes show values around 0 (expected) but z-axis never zeroes. I checked code of this library and it seems that all 3 axes are caluclated the same way. I also tried different MPU6050 unit (from the same vendor) and it behaves the same. Any suggestion what can be wrong?