Subject:
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Re: LEGO MindStroms 2.0: Alternative transmission techniques
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 20 Oct 2002 15:11:22 GMT
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Viewed:
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873 times
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I have seen IR-to-RF converters for sale. They are been used for remote
control of any TV/VCR units without having the line of sight from the
TV/VCR-remote controller to the unit.
It is working like this; the remote controller sends a IR signal to this
converter that sends a radio transmission to a receiver that converts the
signal back to IR-signals and send it to the unit that you want to controll.
Since it just converts the data raw without decoding you can use it on any
IR sending/reciving aplication.
Since there are no such things for Lego allready you probably have to
"cheat" by using one of this units? If you are lucky they work on battery
power too...
Search on places that sells stuff like this, TV-shop and so on... Maybe even
X10?
Regards
Øyvind Steinnes
Norway
"Raphael Langerhorst" <lego-robotics@crynwr.com> wrote in message
news:000001c27820$7948b590$01cfa8c0@heimat...
Hi everybody!
First of all, this is my first post to this list although I'm a member
for already a couple of months.
I'm currently working on a quite similar project for school - it's the
last year for me. The school is for something like "electrical
engineering" (with a tendency to programming).
Now to the robot:
general:
I use leJOS for robot programming and Java for PC-side programming. The
code for the robot will be (hopefully) finished next week. My robot
should be able to collect collision data, sensor values etc. and also to
move to specified targets without having to have sight contact to the
PC-station.
where is the ai?
Most computations - way finding for example - is done on the PC side.
The robot just has general information about where is the PC station and
own coordinates. So if he can't communicate (over IR) with the PC he can
try to move closer to the station. In addition he has an execute list.
the execute list:
The PC station can fill up the execute list of the robot what is
basically what he does step by step. Could look like this: move to x,y;
read sensor value; turn on motor; wait for some time; move to x1,y1;
read another sensor value; move to base (PC); build up communication and
send data;
triggers:
Of course a lot of things can happen while executing these things. So I
also want to use triggers, which are also execute lists that are
actually executed when a condition is met. Best example is a collision:
"when sensor 1 has value less than 500 (raw) then stop and send
collision data"; the PC would recompute a route to the target and send
it back to the robot.
On the PC side I haven't done anything yet, it's just in my head what it
should be able to do.
The whole thing should work in one room because I know that it would be
difficult to provide communication within a whole building. But what I
would suggest in that case is a RF transmission. Maybe you could use a
microcontroller to handle the communication and connect it to a sensor
input. As far as I know you can turn a sensor active and passive
(turning on and off supply that is) so you can send data to the µC. And
the µC can send data to the RCX by giving specific sensor values.
I have worked out some documentation already. But the thing is that it
is written in German. If you understand that I could send the docs to
you. The concept for the robot is more or less finished (maybe
navigation needs some rework). Navigation will be difficult anyway.
Greetings,
Raphael Langerhorst
-----original message -----
Von: news-gateway@lugnet.com [mailto:news-gateway@lugnet.com] Im Auftrag
von Andreas Nauerz
Gesendet: Samstag, 19. Oktober 2002 22:24
An: lego-robotics@crynwr.com
Betreff: LEGO MindStroms 2.0: Alternative transmission techniques
Hi,
we want to build a Roboter with the following characteristics and under
the
following conditions:
The roboter should be able to drive through a whole building by itself.
During his drive he detects obstacles, walls etc.
Everything he detects he sents back to a computer.
The computer is the brain of this application.
He holds the program (the logic) of the whole application.
He gives the comand to the robot where to drive and accepts the feedback
from the robot.
Depending on what the robot sends he sketches a plan of the building.
So this roboter is controlled by a PC and acts as a little architect ;-)
We want to realize this via programming the robot with Java, e.g. a Java
RCX
API.
First of all... is this whole project possible ?
Our problem (!):
What happens if the robot leave the room ?
How can we still send data from the PC to the Robot (for control of the
movement) ?
How can we still receive data from the robot to the PC (for feedback
about
obstacles and walls) ?
We do not want to use wires of course.
Any ideas ?
I guess IR is inappropriate in this case, or ?
Are there other wireless solutions ?
Thanks a lot for your support !
Regards, Andreas
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Message has 1 Reply:
 | | Project WIRRL Update
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| Hello everyone, WIRRL stands for "Wireless Infra-Red Radio Link". Creating each leg of the RF link independantly isn't really a problem (once you have a reliable 38kHz IR carrier wave). The problem is eliminating link feedback by controlling the (...) (22 years ago, 21-Oct-02, to lugnet.robotics)
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