[Robotgroup] Drive a Droid proposal... How to detect the "fence"?

[Clendon Gibson]

If you are good with geometry, then you can put encoders on the wheels and calculate your position by dead reckoning. The most obvious advantage is that there is no physical fence. 

The encoder wheels should be no more intrusive then a camera except for having them on each wheel. 



----- Original Message ----
From: Eric Lundquist <roboenator at gmail.com>
To: The Robot Group Mailing List <robotgroup at puremagic.com>
Sent: Tuesday, July 8, 2008 11:29:39 AM
Subject: Re: [Robotgroup] Drive a Droid proposal... How to detect the "fence"?

Instead of RF, how about a magnetic trip switch?  I have a roll of the
magnetic strip material used in making refrigerator magnets.  It is not very
strong but could probably be used in conjunction with a hall effect switch
mounted onto the robot similar to line detecting sensors.
- Eric



On 7/8/08, Gray Mack <gray_mack at yahoo.com> wrote:
>
> I like the idea of the wire based dog fence. Since it is RF sensors could
> be completely hidden, the question is of course how well it works. It needs
> to sense accurately about 10-12 inches from the fence. Upon detection, the
> easiest thing to do is make it go really slowly. Then you can instruct the
> 'driver' to go away from the fence, or take over. They get the point when it
> moves painfully slow that they need to turn around. Maybe give them a custom
> controller, a twist knob and a forward/back stick and some buttons for the
> actions.
> -Gray
>
> --- On Tue, 7/8/08, Vern Graner <vern at txis.com> wrote:
>
> > From: Vern Graner <vern at txis.com>
> > Subject: Re: [Robotgroup] Drive a Droid proposal... How to detect the
> "fence"?
> > To: "The Robot Group Mailing List" <robotgroup at puremagic.com>
> > Date: Tuesday, July 8, 2008, 9:50 AM
> > Andre Lamothe wrote:
> > > There is going to be a lot of noise, wind, rain  even
> > potentially,
> >
> > Actually the event is scheduled for an indoors venue so the
> >
> > environmental extremes will be less intense, but I get the
> > idea. Not
> > exactly a perfect noise free (visual, RF or otherwise)
> > area! :)
> >
> > > RF to work would be too complex, I would stick to
> > basics and use
> > > reflective tape (like from home depot),
>
>
>
>
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