Flight Controller Board Question

Info and discussion about the original AQ v6 flight controller

Flight Controller Board Question

Postby Blakeanator » Sun Jun 22, 2014 10:39 pm

Hello,

I am debating whether or not to get AutoQuad flight board for my quadcopter. I just have one question though that I can't seem to find an answer to. Can the AutoQuad flight board fly a quadcopter with rotating rotors? We would be using the quad plus setup (as seen here: http://autoquad.org/wiki/wiki/getting-s ... ing-table/). The only difference is that rotors A and C would rotate left/right and rotors B and D would rotated forward/backward. Will AutoQuad do this "out of the box" so to speak? If not, can it even be programmed to do that?

Thanks,

Blake
Blakeanator
 
Posts: 9
Joined: Sun Jun 22, 2014 12:29 am

Re: Flight Controller Board Question

Postby LPR » Mon Jun 23, 2014 1:23 am

Blake

You can make a custom motor mix so just about any flyable design of multicopter could be controlled.
I'm afraid I don't understand your description of your quadcopter design.
Here some info on the basics of how quadcopters fly.

http://en.wikipedia.org/wiki/Quadcopter

Larry
LPR
 
Posts: 1323
Joined: Tue Jun 26, 2012 1:29 pm
Location: MN, USA

Re: Flight Controller Board Question

Postby DUKE40 » Mon Jun 23, 2014 5:27 am

Hi Blake,

do you mean that your motors will not be fixed to the frame but could additionally rotate on the quadrocopter arms?
Like the motors of the Boeing V-22 Osprey?
Best regards,
Image
Spacewalk 550, MT2216-11, SimonK 20A ESC, AQ6 DIMU, 10x5" CF, SJ4000
CamCruiser, MN3510, ESC32, AQ6 DIMU, 12x4" CF, SimpleBGC, GoPro Hero 3 BE
DUKE40
 
Posts: 364
Joined: Tue Mar 26, 2013 9:49 pm

Re: Flight Controller Board Question

Postby Max » Mon Jun 23, 2014 7:06 am

Hi Blake, welcome.

Do you mean tilting the motors using servos? A "rotor" already rotates, by definition. ;)

What are you trying to accomplish? Fast yaw rates?

If you mean tilting them for greater yaw control, then yes, I think this would be possible w/out changing code, using the mixing table, but I've never tried nor heard of anyone doing that. You'd need servos capable of 400Hz input rates, unless you modify a bit of code.

However if you just want quicker yaw, IMHO there are easier/more reliable ways to achieve that.

Cheers,
-Max
Max
 
Posts: 2814
Joined: Mon Aug 13, 2012 9:45 pm
Location: Near Ithaca, NY, USA

Re: Flight Controller Board Question

Postby Blakeanator » Fri Jun 27, 2014 6:30 am

Hi everyone,

Thank you for the replies. Yes I am trying to achieve an Osprey-like tilt effect on the rotors (I know that rotors already rotate :D ). I understand that the default setup just speeds up the rotors for the quadcopter's movement. I would need them to also rotate. The idea behind this is that the quadcopter can move about but its frame would always stay level to the ground. It sounds like, from your replies, that doing this should be possible. I'm new the the quadcopter space but have a few years of programming experience. So do I need to extensively recode the board somehow to allow this type of flight? And do I need to attach the servos to the board? So sorry for all my questions, again I'm really new to AutoQuad.

Thanks for all your help!

Blake
Blakeanator
 
Posts: 9
Joined: Sun Jun 22, 2014 12:29 am

Re: Flight Controller Board Question

Postby kinderkram » Fri Jun 27, 2014 7:31 am

Hi Blake,

I´ve seen guys trying this with an APM: http://diydrones.com/profiles/blogs/til ... %3A1480244

From the rare videos they don´t look very stable...

Norbert
kinderkram
 
Posts: 2911
Joined: Fri Jun 22, 2012 7:47 am

Re: Flight Controller Board Question

Postby Kisssys » Fri Jun 27, 2014 2:27 pm

I have always had interest in the Osprey but it would be a huge project. The real Osprey has swashplates so the mechanical aspect is huge. The software to control it in heli mode or aircraft mode wouldn't be has hard as getting the transition from one to the other correct. I've set in the XV-15 and the controls in the real aircraft are pretty straight forward.

I've seen a flew modelers have done it. Here is one of them.
http://helipilotonline.com/rotormast-v-22-osprey-part-iii/
Steve
Kisssys
Kisssys
 
Posts: 1340
Joined: Sat Jun 23, 2012 9:23 pm

Re: Flight Controller Board Question

Postby Blakeanator » Sun Jul 20, 2014 5:03 am

Max wrote:You'd need servos capable of 400Hz input rates, unless you modify a bit of code.


So I need to find servos that work at 400Hz? I found one at 333Hz here: http://www.hobbyking.com/hobbyking/store/__50469__Turnigy_TGY_BLS815MG_HV_Digital_Brushless_Servo_w_Alloy_Case_20kg_07sec_68g.html. So I would have to modify the code to get it to work with this servo? Or Is it easier to find a 400Hz servo?

Thanks again for the help!

Blake
Blakeanator
 
Posts: 9
Joined: Sun Jun 22, 2014 12:29 am

Re: Flight Controller Board Question

Postby Max » Sun Jul 20, 2014 5:30 am

Changing the output frequency of all PWM motor outputs is very simple -- MOTORS_PWM_FREQ macro is defined in each of the board_*.h files. Changing the output of individual ports would be only a little more complicated -- I'd probably put some conditional logic in motors.c/motorsPwmInit() and set the frequency based on port number (motors get 400Hz, servos get 333 or whatever).

I'd say the code option is easier and cheaper than finding servos that work well at 400Hz (333 seems a lot more common). I'd choose good quality servos for such a task, smooth and fast. I'm guessing that a servo which is good for a gimbal would also work well here.

Also, don't power the servos directly from the AQ board -- only hook up signal (and optionally ground) to the motor outputs, and use a BEC for power directly to the servo. You can also use higher voltage servos that way.

-Max
Max
 
Posts: 2814
Joined: Mon Aug 13, 2012 9:45 pm
Location: Near Ithaca, NY, USA

Re: Flight Controller Board Question

Postby Debian » Sat Feb 06, 2016 9:44 am

Hi guys,
I'm interested in developing a V-22 Ospery frame and let it fly using AutoQuad M6.
So I have a pair of questions about that.
1) did you already successfully develop such a concept?
2) do you tilt the motors using a ESC or a servo?
3) did you need to change the original code to get a smooth transition between hovering and flying straight?

Thank you very much in advance.
Debian
 
Posts: 9
Joined: Wed Aug 12, 2015 3:20 pm

Next

Return to AutoQuad 6 Flight Controller

Who is online

Users browsing this forum: No registered users and 2 guests