"Both.
The 3DR module was working correctly in February as shown here: https://www.youtube.com/watch?v=VQFNICnsTk0
Early this month the pixhawk started giving readings of 14V (alarming because we are using a 3S battery). I used the power module…"
Did you figure out a good way to use the sonar as a proximity sensor? I might try messing with the config etc. because I would like the copter to slowly approach the wall.