MPU-9250 external compass not detected

@thoyo wrote:

I have a 3DR PX4 board. Following the instructions from here:
http://ardupilot.org/copter/docs/common-installing-3dr-ublox-gps-compass-module.html

I am able to connect to it the external GPS + compass module from 3DR and calibrate it correctly on Mission Planner.

Now I try to use the MPU-9250 IMU (accel, gyro and magneto) as the external compass. The IMU is mounted on the Grove 9DOF board (http://wiki.seeed.cc/Grove-IMU_9DOF_v2.0/), which provides two I2C interfaces (primary and auxiliary).

Unfortunately, the MPU is not detected by the PX4.

Firmware version I am using: APM:Copter V3.4.2 (6076bdf)

I checked the wiring, and it seems to be ok.

Thanks a lot, any help will be appreciated

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