Controlling the path
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Controlling the path Ken O 06-23-2006
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Posted by Ken O on June 23, 2006, 1:36 pm
Hello,

I was wandering if the follwoing is possible.
Building a robot that could go around a room (no obstacles) in a spiral
manner with only 3.5mm inside of the preceeding path. The robot would be
going very slowly and not follwoing a line.
I am open to suggestions.

thank you
Ken



Posted by Padu on June 23, 2006, 2:44 pm
"Ken O"
> Hello,
> I was wandering if the follwoing is possible.
> Building a robot that could go around a room (no obstacles) in a spiral
> manner with only 3.5mm inside of the preceeding path. The robot would be
> going very slowly and not follwoing a line.
> I am open to suggestions.
> thank you
> Ken

Well, everything is possible, given unlimited time and budget. :-)


I think the biggest problem here is finding the appropriate set of sensors
that will provide you enough accuracy.

For example, one could implement such a robot using a wheel encoder and a
gyroscope. In a perfect world, you'd just input the room dimensions and the
robot would make perfect 90 degree turns after running for a certain
distance.
On our less than perfect world, you will find that gyros drift, and wheel
encoders accuracy are dependent on the wheel material and type of surface.

On the other hand, there are autonomous agricultural machines that are
guided by expensive GPS systems (precision smaller than one foot) that are
programmed to work a plantation field in a similar fashion you described
above.

Cheers

Padu



Posted by Ken O on June 23, 2006, 3:03 pm

> On the other hand, there are autonomous agricultural machines that are
> guided by expensive GPS systems (precision smaller than one foot) that are
> programmed to work a plantation field in a similar fashion you described
> above.

I thought about implementing some beakons around the room, the robot
could communicate with them and triangulate itself in a given room size.
would that be possible?
I am confuses on how it will determine the distance.

ken



Posted by Padu on June 23, 2006, 3:27 pm
"Ken O"
>> On the other hand, there are autonomous agricultural machines that are
>> guided by expensive GPS systems (precision smaller than one foot) that
>> are programmed to work a plantation field in a similar fashion you
>> described above.
> I thought about implementing some beakons around the room, the robot
> could communicate with them and triangulate itself in a given room size.
> would that be possible?
> I am confuses on how it will determine the distance.
> ken


Yes it is possible. There are a couple of commercially available solutions
such as tge NorthStar (expensive though)
http://www.evolution.com/products/northstar.masn

I don't know if 3.5mm is within their accuracy figures.

Cheers

Padu



Posted by Curt Welch on June 23, 2006, 9:43 pm
> "Ken O"
> >> On the other hand, there are autonomous agricultural machines that are
> >> guided by expensive GPS systems (precision smaller than one foot) that
> >> are programmed to work a plantation field in a similar fashion you
> >> described above.
> > I thought about implementing some beakons around the room, the robot
> > could communicate with them and triangulate itself in a given room
> > size. would that be possible?
> > I am confuses on how it will determine the distance.
> > ken
> Yes it is possible. There are a couple of commercially available
> solutions such as tge NorthStar (expensive though)
> http://www.evolution.com/products/northstar.masn
> I don't know if 3.5mm is within their accuracy figures.
> Cheers
> Padu

Looks like that only gets accuracy down to a few CM - which is very good,
just not what Ken seems to be looking for.

--
Curt Welch http://CurtWelch.Com/
curt@kcwc.com http://NewsReader.Com/

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