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Support for Omni Boats coming in Rover-3.5

arduboat
omniboat

(rmackay9) #27

@wsg1873

so when travelling to a waypoint, the car/boat will turn to face the waypoint and then drive forward. If it moves off the line between waypoints, it will turn in towards the line and move forward.

In the future, when we have lateral support in Auto, I think the vehicle will probably always face the waypoint, and when it moves off the line, it will shift sideways to get back on the line.


(Wsg1873) #28

en,if Rover has the lateral support in auto,it would make omni X cars poplarized in many apsects. It would be a great acheivement! Thank you for your answers!


(Ammarf) #29

wsg1873,

Lateral movement isn’t supported in Auto and Guided yet. You’re probably right about L1 control not being ideal, as Randy said, the current idea is to convert lateral acceleration to lateral movement output, this will move the vehicle laterally in order to help it stay on the line connecting two waypoints.


(ERL) #30

Hi Guys

With some tuning I can confirmed that the X frame works well in auto and loiter. I ran a small 6 waypoint mission all worked as expected, loiter also good.

Cheers


(rmackay9) #31

ERL,

Great, thanks very much for testing and feeding back!


(ERL) #32

No worries Randy, Glad to help.

Here is some footage i took about a year ago, using ardusub as the code base.

The X frame boat is in stabilised mode, automatically keeping the heading from the last controller input.

I am using a “calibrated” stick to try and change the heading. There is no controller input from myself

If this mode was to make it’s way into rover it would be a great help to me.

Cheers


(rmackay9) #33

ERL,

nice video, thanks.

Yes, if all goes well we should have a mode like this coming… basically I think once we add lateral support to ACRO mode it will do what you want… I think… The only thing is that ACRO would also try and hold position if it had a GPS. If it didn’t have a GPS position then it would be just like what you’re looking for… heading hold but otherwise manual…


(ERL) #34

Thanks for the reply Randy.

My reasoning is that I want to take flow measurements and maintaining a heading directly into the flow is important. ideally I want to automate this, but there are times were GPS will not work ( tall trees on the side of riverbank) so i will need to use manual mode.

A Stabilised type mode would help a lot in very low/slow flow and the wind blows hard in the wrong direction effecting the heading. Taking some of the driver error or helping the driver in preforming measurement.

I guess I could turn the gps off if it is not needed for driving manually.

In this video stabilised is on and you can see when the boat changes direction moving laterally the autopilot takes hold of the heading. The end result is very straight clean lateral movement, which is what I’m chasing.
I am only using 1 stick on the controller, lateral / forward reverse.

Any move to a mode like this is a great help Randy, thanks for the continual improvements and efforts.


(Kg Fairbarn) #35

Would be interesting to use a Voith drive with this frame type…


(rmackay9) #36

I’ve never seen this before! It’s a bit like how a traditional helicopter flies which involves changing the pitch of the blades as they rotate. I suppose the complexity is mostly in the mechanical setup itself… the inputs to the mechanical bit may just be forward-back and left-right. Anyway, if someone puts in the hard work to actually build this mechanism, I’m happy to help with the software side 'cuz I think it’ll be far easier than the hardware!


(Kg Fairbarn) #37

Graupner has been making these for a long time but they are relatively expensive.


(rmackay9) #38

OK, so the interface is not difficult to support I think. It would need a 360 degree servo controlling the top bit and then the motor speed would just be another PWM output from the back of the flight controller so not bad.

Thanks for sharing!


(Labomat) #39

I am planing to add Ardupilot support to a rc diving support vessel (model), that is equipped with Schottel propellers - basically propellers that can be vectored horizontall (at 270°). The boat has two set of propellers at the bow and two at the stern (acting parallel). Is there a setup for this kind of layout?


(Reza) #40

Hi rmackay9,

I’ve been trying to set up a frame like this, but have run into issues getting the motors to actually run. I’ve uploaded the software and changed the configs, as instructed. I was wondering if you had any insights into what is going wrong? Does it maybe have to do with what frame_class I am using?

Here are some pictures on the test bench, in case I messed up the wiring somehow.


(rmackay9) #41

@labomat,

We don’t support propeller’s that heading can be rotated around (yet) I’m afraid. I’ve seen some expensive looking research boats that have this so it has crossed my mind to add support. it’s not terribly hard but it’s certainly a few days of effort for someone. Probably the first step is to raise and issue in the issues list so the request isn’t forgotten.


(rmackay9) #42

@RezaB

Have you tried the motors test in the MP? After that a log file is probably the best way for someone to look into this.


(Reza) #43

Hi @rmackay9,

I have just tried the motors test but receive the error: Command denied by autopilot. This is with the vehicle armed. I assume this is the problem I am having, how can I fix it?

Thanks,
Reza


(rmackay9) #44

Hi Reza,

Just disarm the boat and the motors test should work. If the vehicle is automatically always armed after startup then there’s a parameter, ARMING_REQUIRED that must be set to “1” to allow arming/disarming.


(Reza) #45

Even with the vehicle disarmed, I am running into this problem.


(Labomat) #46

Maybe it ist already there: I think this is about my issue: https://github.com/ArduPilot/ardupilot/issues/7481