"Craig said:
Make sure sonar is still supported on APM:Copter for APM boards. I seem to remember it is disabled by default in source code after 3.x. Also if you're using the horrible SR-04 then you're better off without it as they blow chunks.…"
i have apm 2.6 with quadcopter configuration .. it flies perfectly. but i wanted to add sonar to it for better altitude hold capabilities.. i have made the connections all right and also enables the range finder parameters correctly .. but no luck..…