Comments

• 

  Troy Fardell November 23, 2012 at 6:07am

  How/where do I access the 'config' area to add in rssi code thing?

  #define CONFIG_APM_HARDWARE APM_HARDWARE_APM2

  What things should I be warned about doing in there?

  Thanks
• 

  Luis Carlos Barrios Fedechen October 31, 2012 at 8:46am

  hi guys...it`s possible to tune the speed response of the servo in the ap_ mount code?? because i found the servo not compensate very well...i use two hi speed servo in mount pan and tilt....i read the code and the camera stab only refresh at 10 hz
  
  thanks for your attention..and hope your's help
  
  Luis Carlos Barrios
• 

  Troy Fardell October 16, 2012 at 5:52am

  Ok Im a dummy...I did have MP on my lappy but it wouldnt connect to the apm (would& get 224 of the 235 files & time out). In frustration I removed all MP programs. Now I dont know if I have downloaded the right ones 2) all the software.)

  My l/top is 32bit XP. I got .net installed. and MP32-1.2.13.msi but wont install.

  something about verify a valid windows installer package. Also tried the zip files but no idea what to do once I open the folder.

  Thanks in advance
• 

  leo October 12, 2012 at 5:22am

  Just purchased Ardupilot mega 2.5 so i am excited to get started. i am a newbie but i want to design  a HIL system with x-plain sending the UAV dynamics to a  test bench ( comprising of motor, esc, control surfaces). I will then use matlab simulink state-flow to run the control algorithms. So its exciting and will be sharing the progress. Any advice and suggestions will be appreciated. mega thanx! 
• Developer

  Doug Weibel September 30, 2012 at 10:50am

  Jerry, depending on the gain value you have set for roll to pitch feedforward, you may be seeing normal behavior.  Many airframes require some "back stick pressure" while banked, which is the purpose of that gain term.  In an elevon configuration it can produce the behavior you describe.
• 

  Shyam Balasubramanian September 30, 2012 at 10:27am

  I don't know if this is the right place to ask this question. How do I set the P-I-D values for my CAMERA GIMBAL using APM (Mission Planner). I use APM-1 board.

  If it can be set, I would save tons of my time...
• 

  John September 30, 2012 at 10:17am

  Hi, I noticed in stabalize mode, in a turn my elevons only go up, not down, but when I pitch the plane up they move down. I've tried every combination under configuration, and can't get them to work.

  I went ahead and launched my x8 and put it in stablize mode, I noticed it turns a little to the right. I tried to trim it, but didn't help. Is this related? I did set level before taking off.

  Thanks!
• Developer

  Doug Weibel September 17, 2012 at 8:21am

  HI Lorenz,

  Jason's comments are (generally) correct.  With a non-linear system sometimes you get counter-intuitive and unusual results, hence the small disclaimer.  Regardless, adding delay into a feedback path almost always reduces stability margins and requires lower gains, and removing the delay will increase stability margins.

  To really choose appropriate gains through simulation is a very significant task, requiring really good models.  I just did some test flights for a new UAV autopilot startup called BlackSwift last week - they (two aerospace engineering PhD's) had gone to considerable effort to find some starting gains prior to actual flight. Other than being stable, they were not very good at all, and about an hour of actual flight time was required for tuning...  Unless you have a really good physics model and really good airframe model I think that is about all you can get through simulation - conservative gains that at least you can expect to be stable.
• 

  Strike Eagle III September 17, 2012 at 7:28am

  @Lorenz - I think there are bigger issues with using HIL simulation for gain tuning such as imperfections in the physics / aerodynamics models employed by X-plane and imperfections in the model of your airplane in X-plane.  They are probably good enough for a starting point, but I think the only way to get good polished gains is from real flight.

  To answer your question though, delays have a destabilizing effect, so if I had to guess, I would say any gains that work with the delays in place would work better (and be a little conservative) when those delays are removed.
• 3D Robotics

  Chris Anderson September 12, 2012 at 1:29pm

  Jesper: No, datalogging is a different chip. To reset/erase that, do a logs/erase