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  • Bradley,

    I am assuming you have tried the "faulty" ESC on one of the other APM outputs or switched the ESC plugs and follow the fault.  Some brands of ESC's have a safety feature that require a control signal within seconds of power up.  Some Eflite and Scorpion ESC's will not work on flight control boards due to this safety feature and time to arm the APM after power is applied.  If the faulty ESC doesn't work on another proven output channel on the APM then the problem is probably the ESC.  The only time I have had an ESC work on the transmitter and not the control board was due to the safety feature.  I have extra Eflite and Scorpion ESC's because of this safety feature. 

  • T3


    I'm still thinking that you don't have the one ESC going to a low enough throttle setting.  Try recalibrating all four ESC to a lower throttle setting by adjusting the trim on your Tx lower.  Having set lower will not bother the APM 2.  Be sure to set it back to center after your done.


  • All of the ground signals should be connected together anyway because most ESCs will have this connected to the -ve wire of the ESC input - these should all in turn all be connected to the same -ve terminal on the battery pack... worth checking that this is the case using a multimeter...

    Sounds to me as if you have a faulty ESC ... I also found that some cheaper ESCs that I'd bought started misbehaving as soon as I used the 5v output from the BEC.


    How does the ESC behave when you plug it into the APM output pins directly?

  • Btw, I also don't use the power harness as supplied by 3DR, since I build my own frame, and power bus.  I plug all my ESC into the APM.  If they are working properly, all the regulators on them should be outputting regulated 5v, and it shouldn't be a problem.  Additionally do that means that all the grounds are connected together, which imho, is better for signal decoding, since all signals are relative to ground.

  • Oops, yes, "I would replace it".

  • Ellison,

    Did you mean that you would replace it?

  • Bradley sounds like you have an ESC that's either failing or just slight out of spec. so that it is not decoding the pwm from the APM properly.  I would not replace it, because you don't want it to fail while in the air.

  • I don't use their power distribution board so I don't power it with the two pin plug at pin 1.  I just checked to be sure and it gets power at all plugs, some recommend using only one ESC for power and unplug the red wire from all other ESC's.  Check all 8 outputs using the graph in Mission Planner to confirm which outputs are being processed by the APM, this will confirm proper configeration also.

  • T3


    Look at the starting guide.  It shows how to connect the ESCs.  You can just connect all the ESC and they will be connected together but it is not the recommended way.  If all the ESC are not the same type connecting them all could be a problem.


  • I will try that. I don't get power to the apm unless motor 1 signal wires are plugged in.
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Drone flying to non visible point

Hi there,I encountered a problem, while flying in auto mode, with approching to point that was not set by trajectory and is not visible after downloading mission from flight controller by Mission Planner. Does anybody encountered similar problem. The situation is that in the middle flight I stopped the UAV and uploaded new mission and after changing to auto mode it starts to fly in some direction. It goes straight to some point, so I assume it's not mechanical problem. I attached the link to…

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Hi,Im working on a autonomous drones and im using JETSON NANO and flight controller PIXHAWK .Im able to control my drone by giving rc commands on the MAVLINK terminal itself by connecting it with PIXHAWK but now i want a python code from which i can do some operations like:takeoff,left ,right,forward,backward…and i am not using GPS…Can anyone please help me…

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1 Reply · Reply by tellinglean Oct 17, 2022

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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