Change Altitude of Take-off mode

[mr TOKI]

Hello !! I followed VOXL m500 instruction changed QGC to Position Mode . When I use takeoff mission but I can not change the Altitude
of takeoff mission (I had changed to 0.5 m but the UAV still head up to 2.5m )
Please show me how to change the alt

[modaltb]

Hi @mr-TOKI ,

There's two modes being mentioned above, position mode and mission.

In mentioning takeoff mission altitude, are you setting up waypoints in QGC? Normally the mission mode is used for outdoor flight scenarios, so when I see you wanting to set an altitude of 0.5m, I'm thinking you are trying to use offboard mode and have a program control the flight?

If that's the case, and fairly easy example of that is found here:
https://gitlab.com/voxl-public/voxl-docker-images/voxl-docker-mavsdk-cpp

BUT be careful disabling the default "figure 8 mode" in the voxl-vision-px4.conf file, which is enabled by default. This will automatically have the m500 fly figure 8's 1.5m above takeoff point, which is perhaps what you are experiencing?

For reference on the 'figure 8 mode' flag, see this line:
https://gitlab.com/voxl-public/modal-pipe-architecture/voxl-vision-px4/-/blob/master/config/voxl-vision-px4.conf#L6

Thanks!
Travis

[mr TOKI]

oh I see thank you. And do you know how much weight that VOXL m500 drone can lift. Thank you !!!

[tb_temp]

Hi @mr-TOKI ,

We've listed 1kg on the datasheet here: https://docs.modalai.com/voxl-m500-functional-description/

Thanks!
Travis

[stevedan]

@modaltb How do we change this height when doing mavros control. It seems like it always goes to the default 2.5 m.

[Chad Sweet]

Using www.google.com to search "PX4 Takeoff Height", I found these results

The first result leads to PX4's takeoff parameters documentation, here: https://docs.px4.io/main/en/flight_modes/takeoff.html

It describes a parameter "MIS_TAKEOFF_ALT Target altitude during takeoff (default: 2.5m)"

You could try working with the MIS_TAKEOFF_ALT parameter? Since its default is 2.5m it might be related to what you are looking for?

[stevedan]

@Chad-Sweet said in Change Altitude of Take-off mode:

MIS_TAKEOFF_ALT

I am able to set this value with the desired height. The issue is that why is it that the takeoff service height is ignored?