I am now using the ArduIMU V3 for my flying/guidance experiments. The AHRS firmware for this device has not yet been released but I have managed to get some preliminary firmware together.
The performance of this device seem promising but I have encountered some electrical problems. It is extremely sensitive to noise when powered on external 5V power supply. It can not be powered by the same 5V bus as e.g. servos. It does however have its own on-board voltage regulator that works well when supplied directly from a higher voltage.
There will be much more about this IMU on this blog.

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