Re: Forward Error Correction and overruns at speed

[Beng Kiat Ng <nbk@np.edu.sg>]

Hi all,

I always try to make my mouse 50% balanced. In that case, I would know that the mouse is mostly resting on it's wheels during those curve turns.

regards
BengKiat

Peter Harrison <peter.harrison@helicron.net>

Peter Harrison <peter.harrison@helicron.net>
Sent by: owner-micromouse@cs.rhul.ac.uk

11/21/2007 07:23 AM

Please respond to
micromouse@cs.rhul.ac.uk

To	micromouse@cs.rhul.ac.uk
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Subject	Re: Forward Error Correction and overruns at speed

Duncan Louttit wrote:
> Hi Pete,
>
> A thought:-
>
> If the mouse is a conventional wheel chair, there is some drag from the
> slider during acceleration and also some different level of drag during
> braking. The drag is probably greater during acceleration if the slider is
> "pulled" and greater during braking if it is "pushed". This would make the
> driven wheels more likely to slip during one phase rather than the other.
>
> From your observations, I would guess that your slider is "pulled" and you
> lose some movement during acceleration. My experience is that it is almost
> impossible to get a mouse started from rest without some lost motion due to
> wheel slip and my PIXIE robot has calibrated compensation for this.
>
> Regards,
>
> Duncan

the chaps at the club Last night had me add a bit of weight to the front
end to make it perfectly balanced. There was some indication that it
performed more consistently but I would need to do some more tests to be
sure. Once the forward error correction is in place, this should go away
but I want it to work as well as it can without correction. As it
stands, I could end up about 4cm short at the end of a 15 cell run.
Curiously, this is a figure that is consistent with Derek's
observations. Even that would be correctable but it would mean the mouse
is running slower than it needs to entering the turn.

Pete

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