I'm using failsafe mode to test the GPS rescue
First try, when I hit the failsafe switch the GPS rescue works fine,
but, when the second try, the quad just fall down.
Does anyone know why this happens?
see the BlackBox log :

https://drive.google.com/file/d/1JHMLuzH...sp=sharing

If you have the sanity checks switched on and any of them fail when a failsafe occurs then the motors will just stop and the quad will drop instead of kicking in GPS Rescue. Likewise, if the number of locked satellites falls below the minimum then GPS Rescue isn't possible so the quad will again just drop instead.

How close was your quad to you when you triggered the second failsafe?

Make sure you have enough satellites (8 is default) before taking off and ensure you are at least 100+ meters away and then engage GPS rescue.

(17-Mar-2021, 11:22 AM)SnowLeopardFPV Wrote: If you have the sanity checks switched on and any of them fail when a failsafe occurs then the motors will just stop and the quad will drop instead of kicking in GPS Rescue. Likewise, if the number of locked satellites falls below the minimum then GPS Rescue isn't possible so the quad will again just drop instead.

How close was your quad to you when you triggered the second failsafe?

Thanks.
I think when the second try the quad closer than the first try.

(17-Mar-2021, 11:51 AM)kafie1980 Wrote: Make sure you have enough satellites (8 is default) before taking off and ensure you are at least 100+ meters away and then engage GPS rescue.

yeah, that is my mistake

There is a minimum default distance of 100m from the launch point for GPS to kick in. If your quad is closer than that distance it will just disarm and drop rather than triggering GPS Rescue. You can configure that default value to be from 50m to 1000m using the following CLI command and changing the value to one of your choice.

(17-Mar-2021, 12:20 PM)SnowLeopardFPV Wrote: There is a minimum default distance of 100m from the launch point for GPS to kick in. If your quad is closer than that distance it will just disarm and drop rather than triggering GPS Rescue. You can configure that default value to be from 50m to 1000m using the following CLI command and changing the value to one of your choice.

Code:

set gps_rescue_min_dth = 100
save

I had changed it to 50m before and I have measured the distance where is the quad fell using google maps and arming position, the distance is more than 50 meters, so maybe it disarmed because the GPS is less than 8 right? or anything can make the quad falls?

(17-Mar-2021, 01:17 PM)Fathir Pahlevi Wrote: I had changed it to 50m before and I have measured the distance where is the quad fell using google maps and arming position, the distance is more than 50 meters, so maybe it disarmed because the GPS is less than 8 right? or anything can make the quad falls?

Possibly. Also, depending on how many satellites were locked, the accuracy may not have been that good. So maybe Betaflight thought it was still within 50m of the launch point. One thing to keep in mind is that anything inside 100m shouldn't naturally cause a failsafe to be triggered. If you end up getting real failsafes at a distance that close to you then there is something wrong with your RC link.

The safest way to do a GPS Rescue failsafe test is to take the props off the quad, leave it on the ground somewhere then arm the motors and walk at least 150m away from it. Check in the goggles to see if the home point is a sufficient distance away, then trigger the failsafe while looking in the goggles to see if GPS Rescue kicks in or if the quad just disarms.

(17-Mar-2021, 01:38 PM)SnowLeopardFPV Wrote: Possibly. Also, depending on how many satellites were locked, the accuracy may not have been that good. So maybe Betaflight thought it was still within 50m of the launch point. One thing to keep in mind is that anything inside 100m shouldn't naturally cause a failsafe to be triggered. If you end up getting real failsafes at a distance that close to you then there is something wrong with your RC link.

The safest way to do a GPS Rescue failsafe test is to take the props off the quad, leave it on the ground somewhere then arm the motors and walk at least 150m away from it. Check in the goggles to see if the home point is a sufficient distance away, then trigger the failsafe while looking in the goggles to see if GPS Rescue kicks in or if the quad just disarms.

Okay, Thank you.