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  • I havent quite understood what you've said. Alt hold is not supposed to keep my quad between a sensor offset?

  • Hi Goncalo *my keyboard doesn't have that c sorry.
    That is probably normal behaviour.

    In ALT hold mode the throttle becomes altitude control. So switching modes doesn't guarantee it will hold its current altitude but rather the altitude relavent to the throttle position.

    Gaining or loosing altitude in the mode tends to be quite glacial but switching back out of it can be exciting ;-)
  • Quick question for 2.9.1 users. When i toggle altitude hold using inertial navigation my quad slowly drift down(eventually touching the ground). This drift is very slow. What parameter should i look after? Is it possible vibrations are causing this?

  • Please help. I can't get APM to see my LEA-6H. Please see the thread I started here.

    I'm still not clear how to use this forum.

  • Hey Reto,

    Thanks for the response... I was confused (been known to happen on occasion), but I'm not using my AR7100, but I am using my Spektrum AR7000.   

    Still having the same issue, no response in the Tx / Rx Calibration page in the Mission Planner.

    I have moved this discussion to the discussion boards, and can be found HERE



  • Moderator

    Hi Thomas,

    The process to build a hex is almost identical to the quad (just add 2 more legs), so it should be quite straight forward.  However, the recommendation to start your own discussion is a good one and then we can answer your specific questions.


  • Hi Thomas.

    Here's the info about the ports you should use for your gimbal and how to configure it in the Mission Planner.


    Perhaps it would be better if you started a new discussion within this forum specific to your issue. It'll be more organized, searcheable and easier to answer your questions.

    Best regards.

    António Cabral

  • @Xomby: manual of your Rx p. 6 states following. Could it be the cause of your problem?
    "Because of the built-in regulator the AR7100/AR7100R has a minimum recommended operational battery voltage of 5.5 volts and is designed to use 6-volt 5-cell NiMH, 7.2-volts 6-cell NiMH or 7.4-volt 2-cell LiPo batteries. (Higher voltage should be used only if the servos are compatible.) While the AR7100 will continue to operate down to 3.5 volts, the AR7100/ AR7100R features a built-in 5.2-volt regulator for the Rudder, Aux 2, Gear 2, Throttle 2 channels output. A 4-cell 4.8-volt battery will not provide sufficient headroom (voltage margin) to maintain a 5.2 regulated voltage. Regulated outputs are provided to allow the gyro, gyro gain and throttle to be operated at the necessary lower voltage while the cyclic servos (aileron, elevator and pitch) are powered directly by the pack voltage (typically 5-cell 6-volt NiMH or if high voltage compatible servos are used 2-cell 7.4-volt LiPo batteries)."

  • 3D Robotics

    Xonby: Use the Power Module with your LiPo. It's the best way to power the board. 

  • Hey Chris,

    Yes, I see I confused things a bit.   I was just TRYING to do the setup calibration with my Rx battery connected, because it was not working with only USB connected.  I do not plan to have an Rx battery once this thing is flying.   I think I read some post that said possibly the receiver may not have enough consistent power through the Arducopter only.

    I'm at the very initial stages of configuration and have not yet connected my LiPo's or anything.   I did get the Power Module with my kit and will be using that.

    So, should I try this initial calibration using my LiPo battery?

    Hope this helps,


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HELP quadcopter: one motor twitching and stuttering

Hello guys,I have a problem with one motor, do not spin and making a sound (videos in attachment), I changed the motor to another ESC and is work, so I checked the connections on ESC and all connections looking great. any ideas or something I can do, iam trying to build YMFC32 Brokking .thank youhttps://youtu.be/LagBqwGbixkhttps://youtu.be/PU20nCxApcs

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Will AHRS_ORIENTATION=8 for Arducopter 3.2.1 on APM 2.5 using a traditional Heli

I have been Reading Chris Olsen posts and watching his videos on Arducopter with traditional Helis using a Pixhawk.I have inherited an older Trex 450 heli with the old Align 3G FBL hardware.  The FBL controller appears to be bad.  So I have an old APM 2.5 without a compass or GPS on board.  I just want to replace the failed Align 3G FBL system with the APM.Now I have to mount the APM under the skids on the heli so the APM will be upside down.I have Two questions.1)  Is the AHRS_ORIENTATION=8…

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Maximum number of Lidar for Object Avoidance

Hi all,I'm setting up my PX4-based quad with ST VL53L0X Lidar sensors (I currently have three) and I noticed that line #24 of the current Rangefinder library (here: https://github.com/ArduPilot/ardupilot/blob/master/libraries/AP_RangeFinder/RangeFinder.h#L24) has the maximum number of sensors set to 10 (ten). Am I understanding this correctly? And has anyone ever tried to setup this many rangefinders (or anything close) with any measure of success?Any input/advice will be greatly appreciated.

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Valid values for Mavlink SCALED_PRESSURE

I have a raspberry pi reading mavlink messages from a pixhawk. When I read SCALED_PRESSURE I get hPa values around 490  - less than half of what I would expect - and a temperature around 4834 in cdegC - seems warm to me. This is consistent with what is shown in Mission Planner (see below). Is this normal or is my barometer on the fritz? I am trying to calculate my own altitude like AP_Baro::get_altitude_difference but in a companion computer.

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