Subject:
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Re: IR and the Casio Fiva tablet pc , and voice recogination .. a fully mobile robot..
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 9 Jan 2001 08:01:26 GMT
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Original-From:
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Steve Baker <SJBAKER1@AIRMAIL.NETantispam>
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Reply-To:
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sjbaker1@airmail.netSAYNOTOSPAM
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Viewed:
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713 times
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patel wrote:
> Even I thought that you have to keep facing the rcx only in front of the
> transmitter, but later I found that it can be controlled even if the rcx
> goes under the bed or some hidden place..
I don't have anything *like* this much luck. I find I can lose the signal
really easily...I think it depends a LOT on the size of the room and the
colour and type of the paint on the walls.
The power from a light source decreases with the square of the range. In
a small room with walls that reflect IR well, your signal shouldn't have to
travel much more than twice the size of the room - worst case. My 'lego'
room is 23 feet square and has non-shiney walls in dark green paint - and
a lot of low level clutter like soft furnishings. That may simply be a
very hostile place for IR signals.
A small room - lined with nice shiney white tiles would obviously work
much better.
Outdoors would probably be the most hostile setting - with nothing around
to reflect stray IR back at the sensor on the robot, you'd be doomed.
If you expect your robot to perform well under a variety of conditions,
it had better have code on board to chase down missing signals.
> I planning to make it like that in VB where u send commands from the pc and
> the robot obeys it .. I want to fix a wireless x-10 cam also .
Yes - I think people have done this before - so it's do-able.
> but I dont get the exact movement of the robot I want , I
> find the motors not powerful enough to make a nice turn .. it sometimes
> appears sluggish.. I always imagined havind a robot that is quick .. when u
> program it to go 2 feet ahead and turn 90 degrees and go 3 feet i want it to
> be exact and do it immediatly..
Well, that's where the subtle robotics issues come in to play.
Use of appropriate gearing - choice of wheels versus tracks - use of
sensors to keep you heading in the direction you think you are going
in - and measuring the distances accurately. Accellerating and braking
*gently* to avoid wheel slip that can mess up rotation-sensor-based
navigation tricks.
There is a LOT more to this than just slapping some wheels and motors
onto a frame and writing the software.
> any of you have any ideas??/ to make them do things fast and powerful ..
> any other alternatives other than the lego motors??
You can use multiple motors connected in parallel to the same RCX output.
> I planned to add a full computer on the robot model , 3 months back I
> had bought the
> smallest pc available so i could use the windows 98 operating system . i got
> the CASIO FIVA tablet pc .. it is around 890 grams . only ..not much weight
YIKES! That's a lot for a Lego robot to carry. I'm working on using a PDA weighing
in at just a few ounces (lighter than the RCX!) that runs a pretty full
version of Linux. That's *MUCH* more practical (and a heck of a lot cheaper)
than a laptop.
A fast-moving robot carrying close to a kilogramme of computers and stuff
will be a *DANGEROUS* thing to have running around. Not to mention issues
of vibration and how that's gonna affect your hard drive.
> but here also i
> found the lego motors have trouble in turning , and running the full load
> with the tablet pc and the x-10 cam ..etc .. any suggestions please..
Yes... "Don't Do That".
Well, the *true* answer is that for a given motor, you can get speed or you
can haul weight - but you can't do both. With enough gearing, your robot
should be able to drag around your kilogramme of stuff - but it's going to
have to be VERY slow.
OTOH, if you can slim down your weight requirements, you can change the
gearing up a bit and get more speed.
You may also want to consider how much time is needed to communicate
between the base computer and the robot and the update rate for your
AI software. If the robot can move *really* quickly then your comms
bandwidth and AI decisionmaking times get much more tight than with
a slow moving beastie.
> Any one has a artificiall intellegence program for windows operatin g
> system ..?? i remember those old dos based programs where you type and the
> computer talks back .. as if it had life and you were taling to someone ..
You may be thinking of 'Eliza' (do a web search on that - and I'm sure you'll
find a version of it out there for free)...which is pretty much as far from
AI as you could imagine. It's a total *hack*.
--
Steve Baker HomeEmail: <sjbaker1@airmail.net>
WorkEmail: <sjbaker@link.com>
HomePage : http://web2.airmail.net/sjbaker1
Projects : http://plib.sourceforge.net
http://tuxaqfh.sourceforge.net
http://tuxkart.sourceforge.net
http://prettypoly.sourceforge.net
http://freeglut.sourceforge.net
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