I purchased a ArduImu V3 a while ago and have just started my journey on making use of this neat little IMU.
Honestly I had a hard time getting my head wrapped around the demo code. It has so much legacy code related to the different versions and also it's relation to the AP hardware. When searching for information it got even more confusing when I came across the discussions on camera gimbal mounts and mini-quad copters all based on different versions of this IMU. Information on the issue of magnetometer calibration was also difficult to come by. For me, it was very confusing looking at code and at first not realizing that it was for a different version. Also, it took me awhile to find the schematics for this IMU - SparkFun has it.
Anyway, just wondering if it would be a good idea to create a discussion group for V3 due to the fact that as far as I can tell the sensors are different? and possibly a code repository?
Roll, Pitch, Yaw output - Head Tracker
Stand alone On-Gimbal Camera Stabilized mount
Basic Mini Quad with PPM RC control
Interfacing additional sensors - Sonar, IR distance