[Dprglist] 2 wheel balancing "car"

Karim Virani pondersome64 at gmail.com
Tue Apr 6 13:09:28 PDT 2021

I agree, I'm not sure I've seen anything convincing in the form of
long-running balancing robots other than nBot. And most of these platforms
are not robots in the DPRG autonomous sense - they are pretty much toys.

The performance envelope of nBot's chassis seems to be a great fit for its
autonomous roaming capabilities - mostly indoors, but you've done a lot of
outdoor testing too. I'm just wondering if you have any kind of interest in
supporting higher speeds? Into the danger zone where the robot can move
faster than you can?

On Mon, Apr 5, 2021 at 10:49 PM David via DPRGlist <dprglist at lists.dprg.org>

> Karim,
> I think 2003 was when the nBot was first published.  Looks like this
> fellow has a very robust platform.  Kudos to anyone who can make a robot
> balance.
> I will say there are now lots of two wheel balancers out there.  Most seem
> to be content to get the platform to balance and they are done.  Most of
> the videos, like these, are just of the platform balancing. Not many take
> the next logical step and add sensors and behaviors.  (You know, like
> nBot).
> My experience has been that introduces a whole new level of challenge.
> cheers!
> David
> On 4/5/21 6:45 PM, Karim Virani via DPRGlist wrote:
> My youtube binge on harmonic and cycloidal drives eventually let me to the
> GearDownForWhat channel where I stumbled over this:
> https://www.youtube.com/watch?v=k_vYA-xRXyo&ab_channel=GearDownForWhat%3F
> This video is of a 2 wheel balancing "car". It's not brand new, but it was
> new to me. The guy does share a simple overview of the control theory.
> Anyhow, this video made me think of nBot and how different a mindset this
> guy's approach seems to be. If David's is a closer-to--NASA (or really any
> kind of professional engineering mindset), then this fellow is more like an
> extreme sports enthusiast or toymaker. Both are interesting approaches, and
> sometimes a free-for-all attitude can push the envelope of what is
> considered reasonable or useful.
> And if you're not familiar with David's nBot:
> http://www.geology.smu.edu/~dpa-www/robo/nbot/
> nBot is around 18 years old now? I remember when it was just a baby -
> David demoed the inverted pendulum bot at the Bill J. Priest Institute back
> in the day. Time to head off to college...
> David, consider yourself poked for a response.
> Best,
> Karim
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