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November 2009


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Configurators <[log in to unmask]>
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Configurators <[log in to unmask]>
Tue, 3 Nov 2009 16:09:37 -0500
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We found multiple times that inserting time delays between functional blocks
will eliminate 'skipping' or unexpected behavior.  Time delay will allow
motion to settle and inertia to dissipate allowing sensors to start from a
stable platform.  


Time is of the essence so delay does not need to be great - sometimes
fraction of a second is enough. 


Good luck to all







From: First Lego League in Virginia and DC
[mailto:[log in to unmask]] On Behalf Of Rusty West
Sent: Tuesday, November 03, 2009 3:03 PM
To: [log in to unmask]
Subject: Re: [VADCFLL-L] Programming/brick problem



We have had the same problem.  Sometimes it skips blocks and other times it
doesn't.  We verified it by putting in sound beeps in certain areas and it
skipped those beeps and the movement blocks.  We are just going to hope we
get one good run when it doesn't skip blocks.  The overall program is good
and the kids have thought it through.  I have no idea why it is skipping
blocks and haven't found a solution.  If anyone finds a solution please post


Rusty West

Team 350




From: First Lego League in Virginia and DC
[mailto:[log in to unmask]] On Behalf Of Sonya Shaver
Sent: Tuesday, November 03, 2009 2:36 PM
To: [log in to unmask]
Subject: Re: [VADCFLL-L] Programming/brick problem


I'm sorry Sherene.  I don't have any answers, just to say that our robot is
doing weird things at times too.  Like we will run a certain program and
then it just starts skipping steps that are in the program, for seemingly no
reason.  It will do that three or four times, then suddenly start working
again.  I have no idea.  We are getting it to work most of the time though.
It sounds like what you are going through is really frustrating!  I would
encourage you to not pull the plug on your team competing though.  That
seems unfair to them with all their hard work.  The robot game is only 25%
of their total score.  They will still be able to talk to the judges about
their robot design and programming, even if their robot does nothing on the
actual table.  And they will give their presentation, and show their
teamwork!  Good luck, and I hope someone can answer here!


Sonya in Harrisonburg


On Tue, Nov 3, 2009 at 1:45 PM, Sherene Silverberg <[log in to unmask]> wrote:

We're having a huge problem with our robot.


the programs are not downloading from the computer to the brick properly.
Despite the message on the computer saying it the program has uploaded, it
is hit or miss if it does.


We're running firmware version 1.28 on Mac OS 10.5.8.


I've done the Mac OS 10.5 firmware fix as indicated here


The programs never run the same way twice. It's like the NXT brick has  a
life of its own.  We deleted all the programs on the brick and then
downloaded just one of the programs.  When we ran the program, it bore no
resemblance to the one we uploaded.  Rather, it looked like another one on
the computer that goes by a different name.


I thought to try to reset the brick but for the life of me I cannot find any
reset button.  Apparently "The hardware reset button is located within the
LEGO TECHNIC hole below the USB connector on the NXT brick.".


For the life of me, I cannot find this hole.


If I can't find a solution ASAP, I am going to pull the plug on the team
competing.   We cannot waste any more hours trying to fix buggy Lego


Can anyone help me?  I'm at the end of my tether.






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