Alt-BEAM Archive

Message #07455



To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Mon, 8 Nov 1999 06:34:05 -0800
Subject: [alt-beam] Re: servo info


Hi Evan,

The list server seems to be very slow! I sent a post to the list at 8:00 PM
yesterday
and it still is not there! Anyway here's a little snip from an earlier post
to answer
yer question and yes, I am working on a new unmodified hobby servo
controller.

---8<---

The hobby servo uses 0V and +3-6V power connected to the black and red wires
respectively and the electronic driver is controlled with pulse width
modulated (PWM) control signals on the white wire. (Important note: servo
wire color codes vary and using the wrong hookup can destroy the servo!
Always check for the correct color code for your servo) The PWM signals are
narrow positive pulses which are 1.5ms in width with a maximum deviation of
+/-0.25ms. This corresponds to the output shaft center position and up to
+/- 90 degree clock wise (CW) and counter clockwise (CCW) rotation. The
repetition rate of the PWM signals is usually between 20-100 pulses per
second. for smooth servo control When the pulses cease the servo remains in
the last position.

---8<---

Wilf Rigter mailto:wilf.rigter@powertech.bc.ca


> -----Original Message-----
> From: Evan Dudzik [SMTP:evandude@yahoo.com]
> Sent: Sunday, November 07, 1999 5:35 PM
> To: beam@sgiblab.sgi.com
> Subject: servo info
>
>
> does anyone have a good explanation of how a HOBBY
> servo can be driven with a circuit? I read it takes a
> 50hz (maybe it was khz) signal to the signal wire,
> power and ground to the others... the question is, do
> you alter the frequency to make it only go partway, or
> does it just turn as long as the signal and power are
> there (in other words, stop the signal when it reaches
> the halfway point) if it is this method, how do you
> make the thing go the other way? reverse the power and
> ground? This is just because christmas is coming, and
> I have a clone of genghis (a bot from MIT) in mind,
> all i need is servos for xmas, and someone to help me
> out with my question! thanks...
>
> =====
> +------------------------+
> |http://surf.to/photovore|
> |Photovores online! |
> |Evandude Dudzik |
> +------------------------+
> __________________________________________________
> Do You Yahoo!?
> Bid and sell for free at http://auctions.yahoo.com



7456 Mon, 08 Nov 1999 09:38:11 -0800 [alt-beam] Re: Home, Sweet Home beam@sgiblab.sgi.com Bruce Robinson Bob Shannon wrote:
>
> Should people be voting without having seen all the enteries?
>
> Evan Dudzik wrote:
>
>> mod worm looked really kool, you can call this a vote
>> if you wish, I am not really familiar with the LEM or
>> diskrat...

Bob's right.

If people have only seen two or three of the entries, you could reserve
their votes, to be used only as a tie-breaker between 'bots they have
voted on.

A vote for just one robot hardly counts.

Bruce



7457 Mon, 08 Nov 1999 13:37:27 -0600 [alt-beam] Re: Home, Sweet Home beam@sgiblab.sgi.com "Paul Atkinson" Any chance someone might re-post the pictures and videos? I know I can't
remember much from the last time I saw them.
Paul

Bruce Robinson wrote:
>
> Bob Shannon wrote:
> >
> > Should people be voting without having seen all the enteries?
> >
> > Evan Dudzik wrote:
> >
> >> mod worm looked really kool, you can call this a vote
> >> if you wish, I am not really familiar with the LEM or
> >> diskrat...
>
> Bob's right.
>
> If people have only seen two or three of the entries, you could reserve
> their votes, to be used only as a tie-breaker between 'bots they have
> voted on.
>
> A vote for just one robot hardly counts.
>
> Bruce



7458 Tue, 09 Nov 1999 17:54:27 -0400 [alt-beam] Re: CONTEST alt-beam@egroups.com michael.hirtle@ns.sympatico.ca (Michael Hirtle)
--------------4BBE9DA210A100C836ED6F71
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Hi, so what are the rules so i can go a head and start building my bot?
and when is the deadline?
do we need a video footage of the bot?
is their a certin demention the bot most fit within?
what is the goal of this contest?

Bob Shannon wrote:

> LEM also did this, for Chiu's contest...
>
> Rik wrote:
>
> > that's funny you mention that..... i was experimenting with the same thing
> > this morning...with felt tip pens!
> >
> > -Rik
>
> ------------------------------------------------------------------------
> -- Easily schedule meetings and events using the group calendar!
> -- http://www.egroups.com/cal?listname=alt-beam&m=1




--------------4BBE9DA210A100C836ED6F71
content-transfer-encoding: 7bit


Hi, so what are the rules so i can go a head and start building my bot?

and when is the deadline?

do we need a video footage of the bot?

is their a certin demention the bot most fit within?

what is the goal of this contest?

Bob Shannon wrote:

LEM also did this, for Chiu's contest...

Rik wrote:

> that's funny you mention that..... i was experimenting with the same
thing

> this morning...with felt tip pens!

>

> -Rik

------------------------------------------------------------------------

-- Easily schedule meetings and events using the group calendar!

-- http://www.egroups.com/cal?listname=alt-beam&m=1

">http://www.egroups.com/cal?listname=alt-beam&m=1">http://www.egroups.com/cal?listname=alt-beam&m=1
 


--------------4BBE9DA210A100C836ED6F71--



7459 Mon, 8 Nov 1999 18:58:36 EST [alt-beam] Check out Transistorized! On your local PBS station, Nov 8 alt-beam@egroups.com, beamrobots@onelist.com, robots@onelist.com beam@sgiblab.sgi.com Blumojo13@aol.com Click">http://www.pbs.org/transistor/splash.html">Click here:
Transistorized! On your local PBS station, Nov 8



7460 Mon, 8 Nov 1999 19:43:54 EST [alt-beam] pbs tonight beam@sgiblab.sgi.com Blumojo13@aol.com

">http://www.pbs.org/transistor/splash.html"> Transistorized! On your
local PBS station, Nov 8

blumojo13



7461 Mon, 08 Nov 1999 21:01:19 PST [alt-beam] ASF: Natural Born Robots beam@corp.sgi.com "Jim Cook" hey for anyone interested heres the full list of show times...


Sun 11-21 ALBUQUERQUE- SANTA FE NM KENW 08:00 PM MT
Wed 11-10 CASPER-RIVERTON WY KCWC 03:00 PM MT
Mon 11-08 CHARLESTON- HUNTINGTON WV WPBO 02:00 PM ET
Fri 11-12 CHARLESTON- HUNTINGTON WV WPBO 02:00 AM ET
Mon 11-08 CHICAGO IL WTTW 12:00 AM CT
Sat 11-13 CHICO- REDDING CA KIXE 06:00 PM PT
Mon 11-08 COLUMBUS OH WOSU 02:00 PM ET
Fri 11-12 COLUMBUS OH WOSU 02:00 AM ET
Sun 11-14 LIMA OH WBGU 05:00 PM ET
Wed 11-10 LOS ANGELES CA KVCR 08:00 AM PT
Sat 11-13 MILWAUKEE WI WMVS 02:00 PM CT
Wed 11-17 NEW YORK NY WNJB 08:00 PM ET
Wed 11-17 NEW YORK NY WNJN 08:00 PM ET
Wed 11-17 PHILADELPHIA PA WNJM 08:00 PM ET
Wed 11-17 PHILADELPHIA PA WNJS 08:00 PM ET
Wed 11-17 PHILADELPHIA PA WNJT 08:00 PM ET
Mon 11-22 PROVIDENCE RI- NEW BEDFORD MA WSBE 08:00 PM ET
Thu 11-18 ROCHESTER MN- MASON CITY IA- AUSTIN MN KSMQ 07:00 PM CT
Wed 11-17 SAN FRANCISCO- OAKLAND- SAN JOSE CA KCSM 08:00 PM PT
Sat 11-20 SAN FRANCISCO- OAKLAND- SAN JOSE CA KCSM 12:00 AM PT
Mon 11-08 SEATTLE-TACOMA WA KCTS 03:30 AM PT


Notice that it is not playing in NH...we just get 4 full hours of the Red
Green show... :(

Sincerely,
Jim Cook
beamboter@hotmail.com
http://www.geocities.com/boter_99




______________________________________________________



7462 Tue, 09 Nov 1999 02:36:01 -0500 [alt-beam] Re: ASF: Natural Born Robots George Rix Red Green Show? Where do you live, can I come over! =3D)
And, for all you Americans out there: Red Green is not an American. He's as
Canadian as I am.
Steve Smith is a Canadian.
Hah! =3D)
Peace out!

Rob Rix

No doubt it will all make sense when we're older =8B Calvin and Hobbes

> From: "Jim Cook"
> Reply-To: beam@sgiblab.sgi.com
> Date: Mon, 08 Nov 1999 21:01:19 PST
> To: beam@corp.sgi.com
> Subject: ASF: Natural Born Robots
>=20
> Notice that it is not playing in NH...we just get 4 full hours of the Red
> Green show... :(

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