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On Sun, 24 Feb 2002 03:37:50 GMT, Derek Raycraft
<derek.raycraft@sitraka.com> wrote:
> Just ran my bot here at home and I did the anti X in 19.94 seconds with
> a placement score of 75. (7 perfect, 1 good)
>
> I don't know what was so different about the library. I got none of the
> spastic behaviour I was getting at the there.
>
> Its so frustrating. :-(
>
> Derek
Welcome to the club. As of thursday night, mine was running the anti-x
in about 29 seconds - some patterns in 27 seconds, although, my robot
doesn't do a pre-scan and therefore has to search every square in the
X, there isn't a lot of variablity between patterns. My typical score
was 70 (6 perfect, 2 good). Gripper action was flawless - yes
FLAWLESS, not the virtual catapult that started to show up in rounds 2
and 3 and rendered the thing completely useless thereafter. I still
don't fully understand it. It was clear, even at the competition, that
the blocks weren't being dropped because the gripper wasn't working
properly, but because the blocks were striking the support structure
that holds the guide rails for the arms, as well as the motor, while
the blocks were being raised. This all points to a problem in
centering over the x-axis index markers. This is a combined function
of motor speed and timing. Timing, being crystal-controlled, is fairly
accurate (although it could be more so if the program were written in
H8 assembler). Motor speed is a function of voltage, which, since the
motor power is unregulated in the RCX, is a function RCX input
voltage, which, in turn, is a function of Hydro line voltage. The 120V
at your outlets can actually vary between (IIRC) 110V and 130V, so
about a 10% drop in line voltage would presumably translate into about
a 10% drop in RCX supply voltage, enough to slow my motors down and
throw the indexing off. It's the only explanation that I can think of
that makes any sense. I had originally thought that maybe my robot had
been damaged (beyond the obvious) in the fall, or that the extra
pieces I had left over might have been critical. After getting it
home, I gave it a more thorough inspection than I had time for on
Saturday. It turns out that the "extra" pieces were critical to the
stability of the Y-axis (not my actual problem). It also turns out
that there are still two pieces still sitting somewhere in the middle
of College Street. None of which could account for the robot's
behaviour. The line voltage problem is the only reasonable thing I can
think of that makes any sense. Naturally, the robot is working here at
home. The next time I'm bringing my variac and setting the line
voltage myself :-(
I am now attempting to assess where I would really have stood had it
worked as it did before, and is working now. The only patterns I can
remember are the anti-X and the Stealth Bomber. Could someone please
list the patterns that were used?
Anti-X - 29 seconds - 5 Perfect, 3 good = 65 points
Steath Bomber - 34 seconds - 6 Perfect, 2 good = 70 points
I'll have to assume that I wouldn't win any of the matches (although I
think there were at least two robots that were noticably slower) and
base my assessment on positioning points only.
Matthias Jetleb
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Message has 3 Replies:
 | | Re: Guess what.
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| (...) Well, since Mario's already responded to this thread, he won't complain about me replying :) We had the xEmployees entry running at the cube again this afternoon to disassemble, but before we started taking it apart, we had to show it to a (...) (22 years ago, 26-Feb-02, to lugnet.org.ca.rtltoronto)
| | | Re: Guess what.
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| (...) I really liked your gripper... I thought I had taken a picture of it, but I must not have... Anywone else have a picture of the retro wonder?? This is a combined function (...) Like you said, timing is pretty consistent, but motor speed (...) (22 years ago, 26-Feb-02, to lugnet.org.ca.rtltoronto)
| | | 110 VAC powered lego motors
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| in some other thread, Mathias said: (...) I don't follow this. if 110 VAC (or some amount) goes in, it drops down to 9 (ish) i know for a fact that the RCX does not have a transformer, so the regulation has to be solid state..... ergo, somewhere in (...) (22 years ago, 26-Feb-02, to lugnet.org.ca.rtltoronto)
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Message is in Reply To:
| | Guess what.
|
| Just ran my bot here at home and I did the anti X in 19.94 seconds with a placement score of 75. (7 perfect, 1 good) I don't know what was so different about the library. I got none of the spastic behaviour I was getting at the there. Its so (...) (22 years ago, 24-Feb-02, to lugnet.org.ca.rtltoronto)
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