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[DPRG] My Daughters Wheelchair (fwd)

Subject: [DPRG] My Daughters Wheelchair (fwd)
From: R. Bickle rbickle at swbell.net
Date: Sun Dec 1 19:11:00 CST 2002

Our robots generally do this, but even getting them to avoid obstacles
is difficult, and usually limited to a set of known obstacles. The
project you propose would be time consuming.

I wonder though, if there isn't a simpler solution. If the object is to
prevent the chair from bumping  into walls while going through doorways,
a wire bumper could be attached at the front corners of the chair which
would turn in the opposite direction if activated. For example, if the
left bumber hits the wall while going through the doorway, the chair
would automatically turn right until the bumper was released. This would
at least prevent bumping walls. 

Rick J. Bickle
Integrated Control Systems

-----Original Message-----
>From: dprglist-admin at dprg.org [mailto:dprglist-admin at dprg.org] On Behalf
Of Kipton Moravec
Sent: Sunday, December 01, 2002 6:23 PM
To: Dallas Personal Robotics Group; Eric Yundt
Cc: davew1962 at tiscali.co.uk
Subject: Re: [DPRG] My Daughters Wheelchair (fwd)

I do not know of anything off-the-shelf.  However that is something most
everybody's autonomous robot does.

You just have to do it yourself or find a local college student or
interested in taking on the project.   It will take a lot of hands on
to tune it, so I can't volunteer to do it from Texas.

There are IR and Ultrasound sensors that can detect range. I would
recommend one or the other.  The biggest hurdle is actually interfacing
into the wheelchair.  Once you find the right spot it should not be a
problem after that.  A simple microcontroller and some interface
circuitry and you should be set.

I am interested in helping if I can, but the distance is a problem.


----- Original Message -----
>From: "Eric Yundt" <eric at facetcorp.com>
To: "Dallas Personal Robotics Group" <dprglist at dprg.org>
Sent: Sunday, December 01, 2002 5:51 PM
Subject: [DPRG] My Daughters Wheelchair (fwd)

> Forwarded on behalf of DW...
> David Warburton wrote:
> > From: "David Warburton" <davew1962 at tiscali.co.uk>
> > To: <info at dprg.org>
> > Subject: My Daughters Wheelchair
> > Date: Sun, 1 Dec 2002 13:56:14 -0000
> >
> > Dear Sir or Madam
> >
> > This is probably a stab in the dark, but here goes anyway. We have 
> > an 8 yea old daughter called Hannah who is disabled with CP and 
> > Epilepsy.
> >
> > She finds it very difficult to control her fine motor movement, and 
> > the ranges of switches available are not very helpful.
> >
> > So we were wondering if there is a product on the market which could

> > be attached to her electric wheelchair that could counteract her 
> > over steering i.e. something that detects solid surfaces and 
> > corrects her steering or would move the chair away from a wall for 
> > instance or guide her through a doorway .
> >
> > I think it would need some sort of optical sensors linked into her 
> > drive system that covered all the exterior of her wheelchair.
> >
> > Regards Dave Warburton
> > 3 Holden Wood Drive
> > Helmshore
> > Rossendale
> > Lancs
> > BB44RQ
> > Davew1962 at tiscali.co.uk
> >
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