"On the APM 2.6 I used the sonar properly filtered and it worked great. On the pixhawk apparently the sonar is not implemented yet on the current 3.1.5 code, it will be on the 3.2 when it will be released.

The landings with the barometer only are…"

"Thanks Thomas. I used sonar before on the APM 2.6 with success. I filtered the cable and added the cap and resistor. However all your links seems to refer to a rover setup - while I am trying to fly a copter.
Is it possible that as according to the…"

"I am trying to use te sonar for the arducopter (quad) configuration.
I tried connecting the Maxbotix 1240 to all available ports on the Pixhawk but I get no response from the sonar. I have the latest firmware, updated September 20th.
While all the…"

"Any takers on this? Any idea anybody?"

"Sell, this issue is closed as well. The probelem was solved by kicking out the Hobbyking DSM communication and bringing some more reliable RC link in. See the solution here:

http://www.diydrones.com/forum/topics/apm-2-5-hexa-twitching-in-sta..."

"Well, it took a while but the problem is solved. It looks like that no ferrite ring, no male to male servo cable could fix this problem. However Richard seem to have the winner answer: The problem is with the remote control.

My radio was a Turnigy…"

"Thanks for all the ideas, I will work on these one by one. I have the ESC's connected to the APM with all 3 wires still left intact, so all 6 ESC's bring in their own BEC voltage to the input rail. Once I tried removing all of them but one - but…"

"The image breakup can be caused by a few things:

- reception problems
- computer does not have enough speed (cpu) to process the incoming images
- slow usb capture device

Please note using 1.2Ghz on any power output requires a valid HAM license.…"

"Nobody has any input on this?"

"Did you try to measure the analog voltage output of the sonar? Does it change when you point your module to different objects?

Maybe you have a defective unit."