Alt-BEAM Archive
Message #08089
To: beam@sgiblab.sgi.com
From: "Timothy Flytcher" flytch@hotmail.com
Date: Thu, 02 Dec 1999 09:33:43 PST
Subject: [alt-beam] Re: beam tek website
I just tried it and got through??? So it must be your server?
Timothy...
California, USA
AT&T is my server...
>In a message dated 12/1/99 1:22:02 PM Pacific Standard Time,
>Bruce_Robinson@telus.net writes:
>
> > http://people.ne.mediaone.net/bushbo/beam/links.html
> > >>
>All I get is"page cannot be found"
> blumojo13
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8090 Thu, 2 Dec 1999 12:57:51 -0800 [alt-beam] Re: D'oh! Head Revelation "'beam@sgiblab.sgi.com'" Wilf Rigter Brilliant Richard! and a good time resurrect the old servohead project.
The attached schematic works with unmodified hobby servos and can be =
used
with an umbilical connection to move the motor or the shaft with =
respect to
the base. In first case the umbilical requires a 2 conductor cable for =
power
and in the second case, the cable is 3 conductors for the eyes. The =
power
required for this circuit is a few ma but the servo continuously draws
50-100ma and more when stalled. A 74HC240 can be used instead of the =
74HC04
shown. In that case, up to 4 servos can be proportionally controlled =
with
analog voltages from a photo bridge or other source like microcore =
outputs
(hexapod), temperature (green house vent), differential sound level
(security camera aiming), potentiometer ( 2 wire remote control), etc).
<<...>>=20
In the uCrawler V2.0, I did what you suggested and replaced the =
circuit
inside the servo housing with the crawler circuit which also uses the =
servo
pot (P1) for feed back to pump the crawler legs. As shown in the =
attached I
changed the time constant from .3 ms to 30ms and that circuit will =
control a
head exactly as you described but power efficiency is not great (ie =
similar
to a bicore). A PS head version should be quite easy to do.=20
<<...>>=20
> -----Original Message-----
> From: Richard Caudle [SMTP:rwcaudle@hpamonon.com]
> Sent: Thursday, December 02, 1999 12:28 PM
> To: BEAM
> Subject: D'oh! Head Revelation=20
>=20
> Hey all,
> =A0
> I just thought of something...I had proposed using a head controlled =
pot
> to drive a +Phototropic robot body a couple of weeks ago.=A0 Inside =
of a R/C
> servo is a gear train,=A0positioning pot, circuitry, and a motor.=A0 =
The
> driver circuit could be removed and a BiCORE (or PSH) circuit put in =
it's
> place and the pot leads going out to the robot's body circuitry.=A0 =
The
> whole thing could be housed in the box for the servo!=A0 The "eyes" =
are the
> only thing that needs to move.=A0 Why mess with the weight of the =
entire
> head.=A0 It dosen't have to go all the way around because it's =
mounted to a
> mobile body.=A0 I have something like servos at home (gleaned from an =
old
> "Teddy Ruxpin") and I'll give it a shot tonight, if I can find my
> 74HC240.=A0 I left it right over there...
> =A0
> Wondering Aimlessly,
> =A0
> Richard
8091 Thu, 02 Dec 1999 18:33:33 -0400 [alt-beam] Re: Pager motors, anyone? alt-beam@egroups.com michael.hirtle@ns.sympatico.ca (Michael Hirtle) I have looked their a few time, but i can't seem to find them, where exactly are
they?
Ian wrote:
> Electronics Goldmine has them for $2.
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