I did a post in the new forum, but I did not get any further response:
Craig said that Pixhawk with sonar works fine, but only if I define sonar pin (SONAR_PIN).
But this parameter is not avaliable in AC. Only in ArduRover e.g.
So can anyone here give me a hint how to activate the sonar in Arducopter for the Pixhawk? Is there a default port?
Because I use the MB 1240 I am be able to use the ADC 6.6 or with a fewer range ADC 3.3 (Pin 15,14 and 13)