Servers by jDrones

ArduRoller - balanced car on pixhawk


(Chinese66) #1

Anyone interested in balancing a car? Has anyone heard of ArduRoller? This is the project web site:
https://makezine.com/projects/arduroller-self-balancing-robot
It used apm2.6 to make a balance car, which I was very interested in, and I tried and succeeded. It can balance, forward, back, turn. I don’t have GPS now, so I can’t try AUTO mode. This is the wiring diagram, and I made it based on this.




As far as I know, the author USES ardupiot code base about three years ago, and he joined the arduroller section.

Now I wonder why pixhawk doesn’t support balancing cars? After the car can balance and steer, its control is no different from tank_rover.
And the latest ardurover has already supported the AB phase encoder. It looks like we can use pixhawk instead of apm2.6 and arduino mega328.
I wonder if there is a plan for a balanced car?
Thanks!


For support balance bots
Wheel encoder on APM, PixFalcon and Mini Pixhawk
(Khancyr) #2

Hello,

There is plan to do it ! It could a good GSOC2018 project ! We just need someone to do it, normally ArduRover is ready to support it


(Chinese66) #3

Here are the video:
https://www.bilibili.com/video/av19592294/


(Chinese66) #4

A new video shows auto mode. (none GPS :laughing:)
https://www.bilibili.com/video/av20473018/


(mundsen) #5

Any progress on this? still only APM 2.6? or new software that support 32bit controllers? Pixhawk…?


(Chinese66) #6

Now this project only use APM2.x.
Now it’s one of “List of Suggested Projects for GSoC 2018”. ArduPilot will support balance bot, on more advanced controllers like pixhawk


(mundsen) #7

Great - have started planning my balancing robot project. I have an original Pixracer that I can use - if not I`ll get a Pixhawk.
My inspiration for this project = ArduRoller = a great project, but hope to use supported controller…

I try to find information that can help me decide if I should use geared DC motor or Stepper motors?
I have Nema17 + a lot of different stepper drivers + have found information about how to control a Stepper motor with PWM signals using a Teency LC… (http://www.instructables.com/id/Control-a-Stepper-Motor-With-PWM/) - but need more time before I decide.

Other Components I consider:

  • Taranis X9D Plus Radio
  • FrSky RX
  • GPS
  • Sonar
  • FPV camera/TX…
  • other fun stuff :slight_smile:

Hardware:

Did order 2 Teency LC - if I need to make PWM/Stepper adapter (do not know yet)

Did order a motor driver shield (if controlling Steppers using I2C is an option)

Frame: Not started yet, but based on alu profiles + 3D printed parts


(mundsen) #8

Any comments about DC Geared motor with rotary encoder VS stepper motor?

Started playing with the nema based design in Fusion360!

nemavd|505x500

I may use vibration dampers like this to reduce the vibations from the Stepper Motors.


(Chinese66) #9

Here are what i use. Dc motor with AB encoder.
The motor drive is A4950. It’s an PWM input driver. Means that APM can driver it directly.
APM cannot driver stepper motor unless you find the right stepper motor drive.
image


(mundsen) #10

An alternative if using stepper motors?


(mundsen) #11

Did order DC motors with encoders + motor driver module

I do not find any news about Pixhawk support, so I may try an APM based controller


(ppoirier) #12

There is a new project that will be developped this summer here:
https://discuss.ardupilot.org/t/congratulations-gsoc-2018-ardupilot-students/28464

Implementation of Balance Bot with Ardupilot, Ebin Philip


(rmackay9) #13

Yes, that’s right. I’m almost 100% sure we will have balance bot support by the end of this summer.


(mundsen) #14

Any information about the electronics used? Based on the original ArduRoller?

Only so I can start planning/ordering what I need.
I have a original PixRacer that I hope to use + waiting for geared DC motors and motor drivers…
My components:

Different sensors
PixRacer + GPS + FrSky RX
Taranis 9xD radio…
3S LiPo


(rmackay9) #15

Hi Mundsen,

That sounds good. Good to see you’ve selected motors with wheel encoders. that’s not a requirement but that will help.

Here is what the balance bot my main support (elab.co.jp) is building for me. This one is missing the GPS in the picture (it has one now) but also the wheel encoders… wheel encoders will be added later.


(mundsen) #16

Cool - is there a project blog…?
What kind of motor drivers is that? Do you have product info/URL?


(rmackay9) #17

Mundsen,

Not yet but I’ve posted a link to this topic with the main developer.


(Ebin Philip) #18

Hi Mundsen,
I’m working on the Balancebot for GSoC. I’m planning to use this motor driver: goo.gl/sczkXH Looks like your list of parts is good enough, but I’m not sure if your motor driver is supported: https://github.com/ArduPilot/ardupilot/issues/7616
I am waiting for the parts to arrive right now, so there isn’t really much to write a blog :smile: but I’ll put one up as soon as we make some progress


(mundsen) #19

Then Ill order the same motor driver, so Ill be able to use the same code… :slight_smile:

Did order one :slight_smile:


(mundsen) #20

Playing with the design while waiting for the parts to arrive.

When I read about self balancing robots I find some saying there should be a weight on the top (like the batteries…) and some other say the main weight should be towards the motor axis - what is best?

In this model I have placed the motor controller on the top of the motors, and the LiPo on the top - should I swap LiPo and controller??