Channel 4 AP output behavior

I have the ArduPilot board and ArduIMU set up on a 4 channel Hawk Sky air frame. The issue I'm having is that when I switch to Stabilize or Fly-By-Wire mode, channel 4 (rudder) deflects to an extreme servo value. The rudder still responds, but the range of values is unusable. The plane behaves correctly in manual mode and the other channels appear to behave correctly in Stabilize and Fly-By-Wire.

It's my understanding that channel 4 output is not supported by the current ArduPilot 2.6 software. This wouldn't be a problem if channel 4 was just routed through the MUX, but this does not seem to be the case. I didn't think there was code to support output on channel 4, so I'm not sure where it's generating the signal.

Has anyone had similar problems or know where I should start looking?

Thanks,

Steven

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Nathaniel Caner June 25, 2010 at 9:08am

If all you want is to have ch4 be independent of the AP system, then don't connect it to the AP board. That is to say connect the ch4 servo directly to the receiver. This will bypass the AP and eliminate your problem.

You are correct in that the ch4 is just a pass through with the MUX, so you should be able to connect it to the AP without any problems that I know of. Obviously you are having a problem so something is amiss.

It might help if you posted a few pictures of your setup. You said "the range of values is unusable", are you testing this on the ground and monitoring the serial data? If so can you post a copy of your output, with an explanation of what you are inputting?

Good luck

amiss.it

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Channel 4 AP output behavior

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