Subject:
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Re: Og Needs More Inputs (fwd)
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 30 Apr 1999 03:43:21 GMT
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Original-From:
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Jim Choate <RAVAGE@EINSTEINavoidspam.SSZ.COM>
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Viewed:
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992 times
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On Thu, 29 Apr 1999, Jim Choate wrote:
----- Forwarded message from Michael Gasperi -----
From: "Michael Gasperi" <gasperi@alynk.com>
Subject: Re: Og Needs More Inputs (fwd)
Date: Wed, 28 Apr 1999 12:52:54 GMT
>----- Forwarded message from Michael Gasperi -----
>There isn't any way to "double up" a rotation sensor. It needs to be
connected
>100% of the time to prevent it from missing counts.
>
>----- End of forwarded message from Michael Gasperi -----
>
>I'm not sure that's accurate. Let's assume a 8-bit rotation sensor.
> Let's assume it is the LEGO rotation sensor. Which is not an 8-bit sensor. It
> is an incremental encoder that sends values back as 4 analog values. If a
> touch sensor is put in parallel with a rotation sensor the analog values would
> get messed up and the RCX will not see movement or maybe even false movement.
>
> ----- End of forwarded message from Michael Gasperi -----
Perhaps I've misunderstood how that angle sensor works. I was under the
impression it was a simple pot (ie analog), are you saying it is actualy
some sort of R-ladder that is switched depending on the angle (ie perhaps
with a ring-slider mechanism)?
Either way, it's a 9V sensor whether the RIS thinks it's a rotation sensor or
a 8-level photo-detector seems dependent on how one interprets the signal.
Personaly, and I've played with mine only a few hours total - I've got the bot
working and need to make a table and hook it to the Linux box. But I'd say
most of the sensors seem usable using 3-bit alone.
It's also feasible to use steering diodes to allow multiple switch sensors on
one detector, each assigned a specific voltage.
If Lego had made the bump switches DPDT instead of SPST there would be a lot
more things you could do with it as well (e.g. external switching via those
contacts). Gee, I wonder if that little micro-switch in there comes in a DPDT
style of the same format?
Somebody said something in one of the exchanges about not altering the Lego.
Personaly that's one of the reasons I own a Dremel and a soldering iron.
I also have no compunction against inserting additional signal processing
in/on the connection wire.
____________________________________________________________________
Three step plan: 1. Take over world. 2. Get lot's of cookies.
3. Eat the cookies.
Anonymous
The Armadillo Group ,::////;::-. James Choate
Austin, Tx /:'///// ``::>/|/ ravage@ssz.com
www.ssz.com .', |||| `/( e\ 512-451-7087
-====~~mm-'`-```-mm --'-
--------------------------------------------------------------------
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: Og Needs More Inputs (fwd)
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| (...) It is an optical (I think) incremental encoder where the 2 quadrature bits are converted to analog values. There is a pretty good description of the LEGO rotation sensor on my web page and also plans for a homebrew version that works about the (...) (25 years ago, 30-Apr-99, to lugnet.robotics)
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