Alt-BEAM Archive

Message #08659



To: beam@sgiblab.sgi.com
From: "Mike Kulesza" mikekulesza@hotmail.com
Date: Thu, 30 Dec 1999 00:16:08 GMT
Subject: [alt-beam] tilden-class walker


So i have those sleek LEGO gearmotors (tiny - 1cm x 1cm x 1cm, efficeint,
high torque)that can be used to make a nice m/s bicore avec reverser
walker... kind off like Tilden's SMT series.

Now the questions:
What should i use for the driver? to SMT transistor deliver as much current
as normal ones for H-Bridge?
Does anyone have any fundamental tips and recomendations for the
mechanics... that seems to be the hardest part - motor orientation, balance,
centre of gravity, LEGS, etc...

Thanks....
______________________________________________________



8660 Wed, 29 Dec 1999 20:21:16 -0500 tilden-class walker Mike Kulesza
> So i have those sleek LEGO gearmotors (tiny - 1cm x 1cm x 1cm, efficeint,
> high torque)that can be used to make a nice m/s bicore avec reverser
> walker... kind off like Tilden's SMT series.
>
> Now the questions:
> What should i use for the driver? to SMT transistor deliver as much
current
> as normal ones for H-Bridge?
> Does anyone have any fundamental tips and recomendations for the
> mechanics... that seems to be the hardest part - motor orientation,
balance,
> centre of gravity, LEGS, etc...
>
> Thanks....
> ______________________________________________________
>


8661 Wed, 29 Dec 1999 17:23:29 -0800 (PST) [alt-beam] 2n7000 and speakers beam@sgiblab.sgi.com "Travis D." Hey all,

I've been wanting to make a D1 solarengine to trigger
a bicore to flash alternating LED's. I'm perfectly
capable of constructing the circuit, but one thing
illudes me--how is it that the 2N7000 circuit senses
the light level!?! Also, you know what would be an
ingenious application of that new chirping
circuit--have it turn on a light after it goes dark.

By this you could simply attach a D1 to that circuit
then have a receiver attached to a light that
mechanically (or electronically) turns it on when it
hears the lengthy whistle. Another cool effect would
be to have the light be on a "track" above your RJP.
If a receiving circuit heard a lot of noise it could
trigger the light to move. This would keep the RJP
VERY active and create a nice chorus of bots.


I am fairly inexperienced in the matter of speakers
and microphones--what are the most commonly used (from
DigiKey):
Microphones--
Speakers--
2N7000 MOSFETS--


Thanks in advance


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8662 Wed, 29 Dec 1999 21:18:12 -0500 [alt-beam] Re: FLED Photovore beam@sgiblab.sgi.com Bob Shannon Max Inggal wrote:

> Looks almost like the one I used except I had
> Photodiodes and tactic sensors. But the schem looks
> like it should work. Good Luck!!

Ahh, there are photodiodes in the schematic, but they are not
connected to the solar engines at all.

This wont work.

> --- "Phillip A. Ryals" wrote:
> > Well, if you could direct me further... I put this
> > schematic together. Does
> > it look right, or am I missing something? I'm not
> > terribly knowledgeable
> > about photovore circuits, and I don't want to waste
> > time if I don't have it
> > right in the first place.

Nope, this is not correct.

You have the photodioces from the photopopper circuit, but
they have no way to control which SE fires first, so this
will not seek light properly.

The 'classis' FLED phovore uses 2 seperate solar cells and
capaitors from each FLED SE. There is no connection between
them at all, and the solar cells themselves detect the direction
of the light.

To seek light, the right solar cell runs the left motor's SE.

> > btw, I basically messed around with the schematic on
> > Ian's site. Just wanna
> > give credit where it's due.
> >
> >
> > Thanks!

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