Hi Guys, 

I have installed a MB1200 XL-MaxSonar-EZ0 to my Quad and it appears to be working in mission planner, but I cannot get it to work in flight.

I have installed the sonar on a plastic tab about 3 inches away from the body and followed the instructions as per the manual http://code.google.com/p/arducopter/wiki/AC2_Sonar

I have ensured that I have enables the correct sonar model in the Hardware Options in Mission Planner

I ran the test in Mission Planner - terminal CLI - test - sonar and which reads 70cms which is about the height the quad is during the test as I had it on a bench. When I place my hand under the sonar or if I raise the quad during the test it clearly displays a change in the test data.  

On my TX I have set channels 5 as Alt Hold and Channel 6 as Pos Hold to test it the sonar and I am flying the quad about 4 meters of the ground but when I engage either pos 5 or 6 it has no effect at all.

I have scrolled the forums looking for more information about setting up sonar but I seem to have covered all the points raised in the forums.

Any ideas, have I missed something? I have not changed any PIDs after installing the sonar as I have not yet mastered PID tuning.

Cheers Dean