Hi everyone,
I started working with ardupilot on a fresh install of ubuntu 16,04 LTS and continuously am unable to arm. For now I just focusing on simulation
When I run:
sim_vehicle.py -v ArduCopter
and then try to arm throttle, I repeatedly get the message
APM: PreArm: Need 3D Fix
Got MAVLink msg: COMMAND_ACK {command : 400, result : 4}
I already set the param ARMING_CHECK to 0 but to no avail…
any ideas?
What flight mode are you in?
This usually happens if you are in Pos Hold or Loiter and try to arm without a 3D Fix.
Guided mode, as far as I am aware, requires a GPS data stream.
What GPS input do you have?
Does it work in just stabilise mode?
Well, But I just want to work in simulation… where exactly is GPS stream meant to come from??
This is really weird, because on another machine with also a fresh ubuntu install I am able to change mode, arm and take off… the issue is that I am away from that machine and can’t check if there are any differences… there must be…
Actually on stabilize mode I am able to arm, but take off doesn’t happen… but in stabilize mode I guess that’s expected
Thanks again,
Hugo
I think I’ve figured out what the problem was…
I have to wait for the following messages to appear:
APM: EKF2 IMU0 is using GPS
APM: EKF2 IMU1 is using GPS
After this I’m always able to arm and take off. I am having another issue now which is when I take off
the and give the alt command at some point that value stops changing and copter continues to go up, but I’ll open a different thread for that. Thanks
Hey @Hugo,
I am facing the same issue of unable to arm in LOITER mode.
I am not getting the mentioned messages.
I was following the instructions mentioned in Erle Robotics Simulation documentation for installation and execution.
Thanks.
I waited but no such message was received.
Can you tell me how much time you waited?
Hey Have you worked it out? I am facing the same issue!