More Questions
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I was wondering...most of the servos I've seen only turn about 60
degrees or so. Are there any that turn a full circle and keep
turning? Or would that be a motor? What kind of those would I get?
degrees or so. Are there any that turn a full circle and keep
turning? Or would that be a motor? What kind of those would I get?
Comments
>I was wondering...most of the servos I've seen only turn about 60
>degrees or so. Are there any that turn a full circle and keep
>turning? Or would that be a motor? What kind of those would I get?
Winch servos will give you about 3 turns. Other than that you talking about
hacking an ordinary servo to remove the mechanical stops.
Regards,
Bruce Bates
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Sent: Tuesday, July 16, 2002 7:30 AM
Subject: [noparse][[/noparse]basicstamps] More Questions
> I was wondering...most of the servos I've seen only turn about 60
> degrees or so. Are there any that turn a full circle and keep
> turning? Or would that be a motor? What kind of those would I get?
Parallax has some servo motors pre-modified for continuous rotation.
Look here:
http://www.parallaxinc.com/html_files/products/BS_Accessories/servos_brief.asp
Part #900-00008
Good pricing & simple to use.
Regards,
-Bruce
webmaster@r...
http://www.rentron.com.
> I was wondering...most of the servos I've seen only turn about 60
> degrees or so. Are there any that turn a full circle and keep
> turning? Or would that be a motor? What kind of those would I get?
Looks like you are asking the same kinds of questions I was about two
years ago. If you are just starting out, I would purchase the BOEBot
kit. It gives you all the supplies you need and a great curriculum
for learning the basics.
Specific to servos, most of the common servos turn about 180 degrees,
although some only turn 60 degrees as you noted. The idea of using a
servo for a drive motor is that it is easy to control speed and
direction via a PBASIC Command without the need for additional
circuits or components. If you were to use a DC motor, for example,
you would need to build a H-Bridge circuit between the Stamp and the
motor. If you were to use a stepper motor, you would need to build a
stepper motor controller between the Stamp and the stepper motor. If
you use a servo, you don't need anything else.
Hooking up a servo to Stamp is easy. However, you need to address
two problems first. The first problem is getting the servo to turn
continuously. To do this, you need to "hack" the servo. The
instructions to do this are very clearly explained in the Robots!
text. You could alternatively, purchase a servo that has already
been modified for continuous rotation (Parallax sells one).
The second problem is powering the servo and the Stamp. The Boebot
circuit board has additional components (the two large capacitors) to
ensure that the Stamp does not "brown out" and reset when the servos
start running (the current drain of the servos may take away too much
from the Stamp). If you are building your own, the "popular" set up
is for a 9v battery to power the Stamp and 4 AA batteries to power
the servos. Make sure to tie all the grounds together!!
Wheels seem to be another "problem". The Boebot comes with wheels
that fit nicely on the servos. If you decide to build your own, it
may be a lot of work. I spent months trying to find a good wheel
that was light weight, had rubber "tires", could easily fit onto a
servo, and was no bigger than about 3 inches in diameter. I finally
came up with the idea of a sink strainer with a large O ring.
Hope this helps!
Steve
I'm thinking: If servos can only go up to 180 degrees, etc., then
they are limited, right? So for wheels, do most people just have two
servos steering in the front 2 and 1 or two motors in the back for
the other two wheels (for a 4-wheel robot)? I noted some of the pros
and cons of using hacked servos in some of the replies.
Also, is there a tutorial anywhere with *pictures* of what's
happening as someone connects a BASIC Stamp to a servo, etc? I'm
pretty new to the electronics culture, and some of the lingo is
pretty confusing (as well as I'm more of a pictoral guy).
Thanks!
--- In basicstamps@y..., "sjoblin001" <steven_joblin@h...> wrote:
> --- In basicstamps@y..., "scallion20022002" <yahoo_spam@s...> wrote:
> > I was wondering...most of the servos I've seen only turn about 60
> > degrees or so. Are there any that turn a full circle and keep
> > turning? Or would that be a motor? What kind of those would I
get?
>
> Looks like you are asking the same kinds of questions I was about
two
> years ago. If you are just starting out, I would purchase the
BOEBot
> kit. It gives you all the supplies you need and a great curriculum
> for learning the basics.
>
> Specific to servos, most of the common servos turn about 180
degrees,
> although some only turn 60 degrees as you noted. The idea of using
a
> servo for a drive motor is that it is easy to control speed and
> direction via a PBASIC Command without the need for additional
> circuits or components. If you were to use a DC motor, for
example,
> you would need to build a H-Bridge circuit between the Stamp and
the
> motor. If you were to use a stepper motor, you would need to build
a
> stepper motor controller between the Stamp and the stepper motor.
If
> you use a servo, you don't need anything else.
>
> Hooking up a servo to Stamp is easy. However, you need to address
> two problems first. The first problem is getting the servo to turn
> continuously. To do this, you need to "hack" the servo. The
> instructions to do this are very clearly explained in the Robots!
> text. You could alternatively, purchase a servo that has already
> been modified for continuous rotation (Parallax sells one).
>
> The second problem is powering the servo and the Stamp. The Boebot
> circuit board has additional components (the two large capacitors)
to
> ensure that the Stamp does not "brown out" and reset when the
servos
> start running (the current drain of the servos may take away too
much
> from the Stamp). If you are building your own, the "popular" set
up
> is for a 9v battery to power the Stamp and 4 AA batteries to power
> the servos. Make sure to tie all the grounds together!!
>
> Wheels seem to be another "problem". The Boebot comes with wheels
> that fit nicely on the servos. If you decide to build your own, it
> may be a lot of work. I spent months trying to find a good wheel
> that was light weight, had rubber "tires", could easily fit onto a
> servo, and was no bigger than about 3 inches in diameter. I
finally
> came up with the idea of a sink strainer with a large O ring.
>
> Hope this helps!
>
> Steve
(standard size) Futaba servos will turn a bit more than 180 degrees. You can
hack them for continuous rotation, but you lose the ability to position them
like a normal servo.
Original Message
> I was wondering...most of the servos I've seen only turn about 60
> degrees or so. Are there any that turn a full circle and keep
> turning? Or would that be a motor? What kind of those would I get?
the servo and cutting off a tab of plastic that stops the servo turning 360
degrees. Then you alter the potentiometer somehow I think. Look on the net
for "hacked servo" or the like. I think I remember seeing that parallax sell
pre-altered servos.
Paul
>From: "scallion20022002" <yahoo_spam@s...>
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] More Questions
>Date: Tue, 16 Jul 2002 13:30:38 -0000
>
>I was wondering...most of the servos I've seen only turn about 60
>degrees or so. Are there any that turn a full circle and keep
>turning? Or would that be a motor? What kind of those would I get?
>
>
>To UNSUBSCRIBE, just send mail to:
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>Body of the message will be ignored.
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>
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MSN Photos is the easiest way to share and print your photos:
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continuous rotate - it would be better to use a stepper motor.
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Ben Lennard, NCEE, Dip EE
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> From: Rodent <daweasel@s...>
> Reply-To: basicstamps@yahoogroups.com
> Date: Tue, 16 Jul 2002 16:44:58 -0500
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] More Questions
>
> The small and / or cheap servos may not have much movement. The larger
> (standard size) Futaba servos will turn a bit more than 180 degrees. You can
> hack them for continuous rotation, but you lose the ability to position them
> like a normal servo.
>
>
Original Message
>
>> I was wondering...most of the servos I've seen only turn about 60
>> degrees or so. Are there any that turn a full circle and keep
>> turning? Or would that be a motor? What kind of those would I get?
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
> of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
mechanical stop inside of a servo to make it continuously rotate. It also has
really good electronics tutorials for beginners.
Robot Building for Beginners
by David Cook
ISBN: 1893115445
scallion20022002 <yahoo_spam@s...> wrote: First of all, thank
you for your reply.
I'm thinking: If servos can only go up to 180 degrees, etc., then
they are limited, right? So for wheels, do most people just have two
servos steering in the front 2 and 1 or two motors in the back for
the other two wheels (for a 4-wheel robot)? I noted some of the pros
and cons of using hacked servos in some of the replies.
Also, is there a tutorial anywhere with *pictures* of what's
happening as someone connects a BASIC Stamp to a servo, etc? I'm
pretty new to the electronics culture, and some of the lingo is
pretty confusing (as well as I'm more of a pictoral guy).
Thanks!
--- In basicstamps@y..., "sjoblin001" wrote:
> --- In basicstamps@y..., "scallion20022002" wrote:
> > I was wondering...most of the servos I've seen only turn about 60
> > degrees or so. Are there any that turn a full circle and keep
> > turning? Or would that be a motor? What kind of those would I
get?
>
> Looks like you are asking the same kinds of questions I was about
two
> years ago. If you are just starting out, I would purchase the
BOEBot
> kit. It gives you all the supplies you need and a great curriculum
> for learning the basics.
>
> Specific to servos, most of the common servos turn about 180
degrees,
> although some only turn 60 degrees as you noted. The idea of using
a
> servo for a drive motor is that it is easy to control speed and
> direction via a PBASIC Command without the need for additional
> circuits or components. If you were to use a DC motor, for
example,
> you would need to build a H-Bridge circuit between the Stamp and
the
> motor. If you were to use a stepper motor, you would need to build
a
> stepper motor controller between the Stamp and the stepper motor.
If
> you use a servo, you don't need anything else.
>
> Hooking up a servo to Stamp is easy. However, you need to address
> two problems first. The first problem is getting the servo to turn
> continuously. To do this, you need to "hack" the servo. The
> instructions to do this are very clearly explained in the Robots!
> text. You could alternatively, purchase a servo that has already
> been modified for continuous rotation (Parallax sells one).
>
> The second problem is powering the servo and the Stamp. The Boebot
> circuit board has additional components (the two large capacitors)
to
> ensure that the Stamp does not "brown out" and reset when the
servos
> start running (the current drain of the servos may take away too
much
> from the Stamp). If you are building your own, the "popular" set
up
> is for a 9v battery to power the Stamp and 4 AA batteries to power
> the servos. Make sure to tie all the grounds together!!
>
> Wheels seem to be another "problem". The Boebot comes with wheels
> that fit nicely on the servos. If you decide to build your own, it
> may be a lot of work. I spent months trying to find a good wheel
> that was light weight, had rubber "tires", could easily fit onto a
> servo, and was no bigger than about 3 inches in diameter. I
finally
> came up with the idea of a sink strainer with a large O ring.
>
> Hope this helps!
>
> Steve
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[noparse][[/noparse]Non-text portions of this message have been removed]
and tips ya'll provided! thanks again!
--- In basicstamps@y..., Nathan Mars <jupemars@y...> wrote:
>
> Here is a book that has pictures and an explanation of how to
remove the mechanical stop inside of a servo to make it continuously
rotate. It also has really good electronics tutorials for beginners.
> Robot Building for Beginners
> by David Cook
> ISBN: 1893115445
>
>
>
> scallion20022002 <yahoo_spam@s...> wrote: First of all, thank you
for your reply.
>
> I'm thinking: If servos can only go up to 180 degrees, etc., then
> they are limited, right? So for wheels, do most people just have
two
> servos steering in the front 2 and 1 or two motors in the back for
> the other two wheels (for a 4-wheel robot)? I noted some of the
pros
> and cons of using hacked servos in some of the replies.
>
> Also, is there a tutorial anywhere with *pictures* of what's
> happening as someone connects a BASIC Stamp to a servo, etc? I'm
> pretty new to the electronics culture, and some of the lingo is
> pretty confusing (as well as I'm more of a pictoral guy).
>
> Thanks!
>
> --- In basicstamps@y..., "sjoblin001" wrote:
> > --- In basicstamps@y..., "scallion20022002" wrote:
> > > I was wondering...most of the servos I've seen only turn about
60
> > > degrees or so. Are there any that turn a full circle and keep
> > > turning? Or would that be a motor? What kind of those would I
> get?
> >
> > Looks like you are asking the same kinds of questions I was about
> two
> > years ago. If you are just starting out, I would purchase the
> BOEBot
> > kit. It gives you all the supplies you need and a great
curriculum
> > for learning the basics.
> >
> > Specific to servos, most of the common servos turn about 180
> degrees,
> > although some only turn 60 degrees as you noted. The idea of
using
> a
> > servo for a drive motor is that it is easy to control speed and
> > direction via a PBASIC Command without the need for additional
> > circuits or components. If you were to use a DC motor, for
> example,
> > you would need to build a H-Bridge circuit between the Stamp and
> the
> > motor. If you were to use a stepper motor, you would need to
build
> a
> > stepper motor controller between the Stamp and the stepper motor.
> If
> > you use a servo, you don't need anything else.
> >
> > Hooking up a servo to Stamp is easy. However, you need to address
> > two problems first. The first problem is getting the servo to
turn
> > continuously. To do this, you need to "hack" the servo. The
> > instructions to do this are very clearly explained in the Robots!
> > text. You could alternatively, purchase a servo that has already
> > been modified for continuous rotation (Parallax sells one).
> >
> > The second problem is powering the servo and the Stamp. The
Boebot
> > circuit board has additional components (the two large
capacitors)
> to
> > ensure that the Stamp does not "brown out" and reset when the
> servos
> > start running (the current drain of the servos may take away too
> much
> > from the Stamp). If you are building your own, the "popular" set
> up
> > is for a 9v battery to power the Stamp and 4 AA batteries to
power
> > the servos. Make sure to tie all the grounds together!!
> >
> > Wheels seem to be another "problem". The Boebot comes with wheels
> > that fit nicely on the servos. If you decide to build your own,
it
> > may be a lot of work. I spent months trying to find a good wheel
> > that was light weight, had rubber "tires", could easily fit onto
a
> > servo, and was no bigger than about 3 inches in diameter. I
> finally
> > came up with the idea of a sink strainer with a large O ring.
> >
> > Hope this helps!
> >
> > Steve
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@y...
> from the same email address that you subscribed. Text in the
Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
>
>
>
>
>
> Do You Yahoo!?
> Yahoo! Autos - Get free new car price quotes
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
a stepper motor requires a driver of some sort and probably some gearing to
make it drive a wheel (unless you use a way-big stepper motor).
Original Message
> Rather than modifying a perfectly good Servo, surely - if you want
> continuous rotate - it would be better to use a stepper motor.