Frame_type betaflight (12) = prearm check frame_class error

ArduCopter Copter 3.6
1

Converting a quad which I previously has loaded with iNav.
Got Ardupilot 3.6.11 loaded on Matek405 std board.
Using QGroundControl…
Everything seems to work - radio, gps, etc.

First flight however it flipped so I figure my motor order may be off. Digging I found some references to a ‘betaflight’ frame type and found it in the docs:
http://ardupilot.org/copter/docs/parameters.html#frame-type

However when I set that to ‘12’ with frame_class as quad I get a pre-arm failure…

PreArm: check firmware or Frame_Class. If I switch back to a X class it arms fine but won’t fly LOL.

So now I’m stuck :frowning:

2

Set it for X and then use the Motor Test in Mission Planner to confirm the correct order and direction for Quad X as per the Wiki.

3

Did you reboot after changing the param? The Betaflight motor order was added specifically for this use case, and has been tested to work. You can of course use X-Class and manually map the channels via http://ardupilot.org/copter/docs/common-rcoutput-mapping.html if it just won’t take the param properly, but that shouldn’t be required.

4

Probably that frame class is only available on ArduCopter 4.0-rc2. So try upgrading.

5

Ah thanks for clarification. Guess I’ll give 4.0 a try.

Been tinkering with motor order on 3.6 using servo settings but despite the order and rotation being correct using the motor test - it just spins out of control during test flight. :\

6

Yeah so far have

1 -> 4 (b)
2 -> 1 (a)
3 -> 2 ( c)
4 -> 3 (d)

And that seems to work when I do the motor test. Rotation and order are correct but when I attempt to hover and take off it just flips.

Digging up my PDB docs that also seems to match the order.

7

Aha! Think I found it - board thinks it’s rotated. Could have sworn I checked that originally but may have reset it when I was changing other params. Lets see if this works :wink:

8

Check this by using the HUD in Mission Planner to confirm it pitches/rolls the correct way.