Subject:
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Re: Very strange problems
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Sun, 21 May 2000 18:03:14 GMT
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Viewed:
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1236 times
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On Sun, 21 May 2000, Tobias Bende wrote:
> Date: Sun, 21 May 2000 19:46:40 +0200 (MET DST)
> From: Tobias Bende <f96tobe@dd.chalmers.se>
> To: Luis Villa <liv@duke.edu>
> Cc: lugnet.robotics.rcx.legos@lugnet.com
> Subject: Re: Very strange problems
>
> > > It seems that emulegos should be able to handle IR. However, it does not
> > > use the lnp-functions that I use, so I presume it is designed to work with
> > > an earlier version of legOS.
> >
> > IIRC, it is 0.1.7, which used a completely different setup for the IR
> > communication.
>
> I was afraid so.
Argh. I was getting emulegos (which I was pretty familiar with) and
legosim (which I though was C, not Java) confused. I'm afraid neither of
them would be too easy to port to 0.2.x :(
> > > Were earlier versions of legOS (I use version 0.2.3) less likely to cause
> > > the RCX to lock up?
> >
> > Unfortunately, no.
> >
> > > Another question for Luis. You said that you had to change in your
> > > programs so they didn't hang the RCX. Did you ever experience that a
> > > program that didn't hang the RCX the first couple of runs, later started
> > > doing this?
> >
> > You mean, unmodified? No, I don't think. I've seen lots of code that
> > worked, and then got "simplified" and then stopped working, but I don't
> > think I've seen unmodified code that suddenly stopped working. Is this
> > the GA code? Or something else?
>
> We haven't reached the GA part yet. Right now the idea is to work out a
> communication protocol and then send a information back and fourth.
Please make sure to share this with us! IR continues to be legOS's
weakest point, and once someone works out a reliable way to do this,
it'll be extremely useful for many people.
> And
> since the RCXs locked up we thought that there must be something wrong in
> the programming.
Unfortunately, no (though if you are multi-threading, there may be some
issues there...)
> It seems we just have to deal with the fact that legOS is strange and try
> to get it to work anyway. I just wondered if we could be resonable sure
> that a program that worked didn't just stop working. That wouldn't be good
> after several hours of training the GA population :).
Yes. We seriously considered doing GA stuff, but this was a concern. I'd
suggest working out a backup protocol, by which the values of your genes
(what is the technical term for that, anyway? I forget.) are regularly
transferred to the PC. That would give you something to fall back on if
there is a problem.
> > BTW, the neural net code is very slow, since it requires floating point
> > emulation.
>
> We figure our GA system will also be pretty slow due to the fact that the
> individuals need to be tested by actually moving the robot. Depending on
> how fast we can transmit data over IR, this might be a time factor also.
Oof. That will be painfully slow, I'm afraid. What problem are you trying
to solve, exactly? I'm very curious, now :)
Luis
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Message has 1 Reply:
 | | Re: Very strange problems
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| (...) We have not done anything to ensure that whatever is transmitted is received correctly (i.e. without errors). What we have done is a build a system which will work even if one (or several) of the RCXs are temporarily blocked for some reason. (...) (24 years ago, 21-May-00, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: Very strange problems
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| (...) I was afraid so. (...) We haven't reached the GA part yet. Right now the idea is to work out a communication protocol and then send a information back and fourth. And since the RCXs locked up we thought that there must be something wrong in (...) (24 years ago, 21-May-00, to lugnet.robotics.rcx.legos)
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