Firts and Second compass which one is external?

Archive
1

I have a quad setup with pixhawk mounted near power wiring and external third party honeywell based compass brought out to rod between beams far from power wiring. APM:Copter 3.2 identified both compasses. When calibrated first compass got much lesser offsets than second. After setup quad can’t fix it’s position in loiter and heading had a constant drift. When I almost gave up I tried to change COMPASS_PRIMARY from 0 to 1 and heading drift gone and all gps driven modes became good.

So how can I check which compass is first, second or third - internal or external?

2

The Pixhawk is programmed to select the best of the 2 automaticly

[quote=“Sagaris”]I have a quad setup with pixhawk mounted near power wiring and external third party honeywell based compass brought out to rod between beams far from power wiring. APM:Copter 3.2 identified both compasses. When calibrated first compass got much lesser offsets than second. After setup quad can’t fix it’s position in loiter and heading had a constant drift. When I almost gave up I tried to change COMPASS_PRIMARY from 0 to 1 and heading drift gone and all gps driven modes became good.

So how can I check which compass is first, second or third - internal or external?[/quote]

3

[quote=“FullScalePilot2”]The Pixhawk is programmed to select the best of the 2 automaticly
[/quote]
Than it does it not the best way. I had unstable loiter until set COMPASS_PRIMARY to 1. So I want to check what compass is used.

4

MP explains only APM board requires choosing the correct internal or external. Also states Pixhawk
is auto select. Hope you can start enjoying some flights.

[quote=“Sagaris”][quote=“FullScalePilot2”]The Pixhawk is programmed to select the best of the 2 automaticly
[/quote]
Than it does it not the best way. I had unstable loiter until set COMPASS_PRIMARY to 1. So I want to check what compass is used.[/quote]