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[DPRG] Re: "IT" to be revealed

Subject: [DPRG] Re: "IT" to be revealed
From: David P. Anderson dpa at io.isem.smu.edu
Date: Fri Nov 30 16:05:52 CST 2001


Well, I don't have a robot balancing on two wheels yet!  But I have
suceeded in getting one to balance a pole with a ball on top, the
classic "inverted pendulum" of which bi-pedal hominids are an example.

Here's a picture of it balancing the pole/ball in my office (I don't
get much real work done on Friday afternoons!):


I took one of the three wheeled bases I've been working on and extended
the caster wheel to give the platform more stability.  Here it is
without the pole:


The pivot has a ball bearing in one end and a 5k pot on the other:


The pot has an opamp to precondition the signal for the 8 bit A/D
converter on the cpu board, an MIT 6.270 HC11 board.  It returns
about 7 counts per degree.

Mounted under the center of the pivot is an Analog Devices ADXL202
accelerometer for evaluation.  Here's another view of the pivot:


and another view of it hovering beside me as I take it's picture,


There is a 10 Meg mpeg movie of it balancing and some of me pushing
it around at:


I'll try to make a smaller version and leave it at:



> David Peterson wrote:
> Just saw on Good Morning America that "IT" is supposed to be revealed on 
> Monday on their program. "IT" is a new invention of Dean Kamen, a secret
> project under the name Ginger that has inspired a lot of speculation.  A
> previous invention by Kamen is the Independence 3000 iBot mobility 
> system, a type of balancing and stair climbing wheelchair that may have
> inspired a few balancing robot designs ideas. The iBot was under the
> project name Fred in development.
> David P

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