Alt-BEAM Archive

Message #11340



To: alt-beam@egroups.com
From: "R. Martin Keen" keenerd@juno.com
Date: Sat, 4 Mar 2000 06:25:20 -0500
Subject: [alt-beam] SymVore?


Just wondering if anybody tried this, a cross between a symet and a
photovore?

What I'm thinking of is a photovore circuit, but with two well placed
pager motors acting like vibrators, making it a symet. It seems like it
would have interesting behaviors. If it uses legs it could just bounce
off of things.

Newbie question:
What is the definition of a symet? Walker, photovore, aquavore are all
pretty self evident just by looking at web pics. But many things are
named symet. And how do you pronounce it? I've been saying sim-et.

Thanks for reducing the contradictions floating around my head,

Martin
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11341 Sat, 04 Mar 2000 09:29:52 -0800 [alt-beam] Re: Problems with the FAQ! beam@sgiblab.sgi.com Laura Malinowski Laura/Rob Malinowski
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x-mac-creator="4D4F5353"
content-transfer-encoding: 7bit

Try http://people.ne.mediaone.net/bushbo/beam/main.html
for the answer to your last question sing this to the tune of Blue Suede
Shoes:

His face was blue,
his tongue was black.
He's dead and gone,
he aint comming back.

chorus:
He's Elvis,
you won't see him at the grocery store.
That's all because,
Elvis ain't breathing no more.

Q: What would Elvis be doing if he where alive today?
A: Scratching at the inside of his coffin.

Rob M.


Hector Villafuerte wrote:

>

> Hello!I am new in all this BEAM stuff, and I am trying to read some
> info about BEAMs so I don't ask maybe silly questions.But here's the
> first silly question: I have Internet Explorer 5 and I don't know why
> it can't acces the BEAM FAQ located at
> http://www2.xtdl.com/~bushbo/beam/FAQ.htmlIs there a mirror of this
> FAQ?Is this URL wrong (actually I found it in the "Welcome to BEAM"
> message from this mailing list)?Is this another bug from Microsoft's
> products (IE 5 )?Is Elvis alive? :-) I'll wait for some of your
> answers, thanks. Hector Villafuerte


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Try http://people.ne.mediaone.net/bushbo/beam/main.html">http://people.ne.mediaone.net/bushbo/beam/main.html">http://people.ne.mediaone.net/bushbo/beam/main.html

for the answer to your last question sing this to the tune of Blue
Suede Shoes:

His face was blue,

his tongue was black.

He's dead and gone,

he aint comming back.

 

chorus:

He's Elvis,

you won't see him at the grocery store.

That's all because,

Elvis ain't breathing no more.

Q: What would Elvis be doing if he where alive today?

A: Scratching at the inside of his coffin.

Rob M.

 

Hector Villafuerte wrote:

 


 Hello!I
am new in all this BEAM stuff, and I am trying to read some info about
BEAMs so I don't ask maybe silly questions.
But here's
the first silly question: I have Internet Explorer 5 and I don't know why
it can't acces the BEAM FAQ located at http://www2.xtdl.com/~bushbo/beam/FAQ.html
http://www2.xtdl.com/~bushbo/beam/FAQ.html">http://www2.xtdl.com/~bushbo/beam/FAQ.html size=-1>Is
there a mirror of this FAQ?Is this URL wrong (actually
I found it in the "Welcome to BEAM" message from this mailing list)?
Is
this another bug from Microsoft's products (IE 5 )?
Is
Elvis alive? :-)
 I'll wait for some of your answers,
thanks.
 Hector Villafuerte






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11342 Sat, 4 Mar 2000 11:25:24 EST [alt-beam] WOO-HOO! beam@sgiblab.sgi.com BUDSCOTT@aol.com Well, thanks to all you guys' input, i finished my walker and it works
wonderful! As soon as i get some pics and somebody who wan't to post other
peoples work, i'll put up some pictures. Right now it just walks forward and
thats about it, gotta mount a tacticle sensor, and after a while, maybe put
in some photodiodes. Making my photovores was nothin compared to making this,
most of those i spent less that a day on, this took me a couple weeks, not to
mention the part gathering and planning stage! thx a ton, i appreciate it!

-Spencer



11343 Sat, 4 Mar 2000 12:08:50 -0500 (EST) [alt-beam] Re: escap motors beam@sgiblab.sgi.com jester96beam@iname.com I also found some good gear motors on E-Bay. There are 2 of them for $4.99 (I think that's for both, but either ways it's quite a deal). At 12V @ 15mA they run at 32rpm. I know 12 volts is a little high for walkers, but I'm sure they'd be great for other wheeled bots. Dimensions are 1.5" x 1.5" x 1.25" with a 0.120" diameter shaft with a 0.75" length

Chris

---- you wrote:
> If 10-12 rpm motors are useable by any one, there are two available on
> E-bay going for $30.
> The E-bay number is 269065712. They run on 5-6 vdc. At 10-12 rpm's that
> a lot of torque, just think of load carrying bots. No, it is not my
> auction just trying to be helpful.
> Rob M.
>
>


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11344 Sat, 4 Mar 2000 15:51:26 -0500 [alt-beam] Re: photoresistors "William Cox" Umm.. this is kinda confusing. Can I just hook up a motor to the wires that
say "motor"? I really have very little electronic knowledge past resistors,
transistors, caps, and such. Exactly how do I make an oscillator? And what
about his H-Bridge stuff? Can I just hook up the motors directly? Oh, and do
I just use like a HCT240 for the inverters? Thanks.
-William

> In operation:
>
> - a pulse causes two parallel Nv's to go active simultaneously.
> Since the two outputs feed two sides of the head motor, the
> head won't move.
>
> - the photoresistors have a much lower resistance than the 1 meg
> resistors, so they shorten the usual Nv delays considerably. With
> different amounts of light striking the photoresistors, the Nv on
> the brighter side will time out more quickly and go inactive.
>
> - this will immediately start the head moving, until the slower Nv
> times out.
>
> - In order to make the motor run longer, the photoresistors are
> connected via diodes to the opposing Nv outputs. This means
> when the faster Nv times out, it effectively takes the
> photoresistor out of the slower Nv. This slows the Nv right
> down.
>
> - Each pulse from the oscillator moves the head a little.
>
> - The effect is to move the head in short bursts until the
> resistance in the photoresistors is balanced.
>
> Point the photoresistors slightly away from each other (i.e., not
> parallel) and shield them from overhead light. You will also want to
> have well matched phtotresistors. The circuit responds very nicely, but
> is highly sensitive to anything that unbalances the circuit.
>
> Note that you can't feed a common H-bridge with this circuit, as it will
> turn on both sides at once & fry the bridge. With a low current motor,
> you could use a 74HC245 to drive the head; or try one of Wilf's
> "smokeless" bridges on the Beam Heretics site (Rigter Archive). I
> believe Wilf also created a similar circuit to this one which used a
> single chip to provide some limited head driving capability.
>
> Enjoy,
> Bruce


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