Fwd: Pan / Tilt camera using 2 steppers + BS2-IC (if possible)
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Posts: 46,084
Hi
Yes, I need to record movements, and if it is
possible the focus.
I am thinking that it similar to a plotter
machine. I think that I could do it whith steppers
and encoders.
Do you know something about that, because a
plotter need to play the recorded instructions.
Thanks: Joe
> --- davemucha@j... wrote:
> > Hi Joe,
> >
> > I'm not sure what you mean by recording and
> playing
> > back movements ?
> >
> > I sorta-kinda assumed that you would look right,
> > measure distance, look left, measure distance and
> as
> > long as you were say, a foot or mor from an
> object,
> > you would make no coruse correction.
> alternaitvely
> > you could subtract the right from the left and
> > center the path movement.
> >
> > can you fill me in on what movements you are
> trying
> > to record ?
> >
> > Dave
> >
> >
> >
> >
> >
> >
Joe Terk <joeterk@y...> writes:
> >
> > From: Joe Terk <joeterk@y...>
> > To: davemucha@j...
> > Subject: Re: [noparse][[/noparse]basicstamps] Re: Pan / Tilt camera
> > using 2 servos (or steppers)+ BS2-IC (help)+ ?
> > Date: Wed, 20 Nov 2002 07:04:24 -0800 (PST)
> >
> > Thanks Dave:
> >
> > Yes, steppers could be better.
> > I understand the feedback , but
> > any idea about how can I record and
> > play movements later. ?
> >
> > Many thanks : Joe
> >
> > --- Dave Mucha <davemucha@j...> wrote:
> > > I see two options pretty quickly.
> > >
> > > use some feedback such as a potentiometer or
> > encoder
> > > to record
> > > movement.
> > >
> > > use a stepper as the motor.
> > >
> > > I think the stepper might be easier as you would
> > > need an H-bridge for
> > > the fwd and rev movements and the stepper would
> > need
> > > a dual H-bridge
> > > for each motor. and Allegro has stepper chips
> for
> > > small steppers.
> > >
> > > Remember, a stepper SHOULD be driven at between
> 5
> > > and 20 times
> > > nameplave voltage, but no more than nameplate
> > > current. and if you
> > > take a uni-polar and drive it in bi-polar, full
> > > winding mode, you
> > > only need half the current to get the same power
> > > output.
> > >
> > > If you salvage some mini-steppers from an old
> > > printer, you may be
> > > able to use a darlington. a UNL2803 (8
> circuits)
> > > could handle one
> > > (low power) motor and it has clamping doides to
> > > eleminate the high
> > > voltage spike that is created on every step as
> the
> > > magnetic files
> > > colapses.
> > >
> > > Dave
> > >
> > >
> > >
> > >
> > > --- In basicstamps@y..., Joe Terk <joeterk@y...>
> > > wrote:
> > > > Help:
> > > >
> > > > We need to move a camera and record
> > > > the pan & tilt moves, because we
> > > > need to repeat the same movements.
> > > >
> > > >
> > > > Servos, must be modified ?
> > > >
> > > > Pan / Tilt must be without vibrations.
> > > > Any Idea.
> > > >
> > > > Thanks : JOE
> > > > PS: Is it better the SSC
> > > > PS2: Is it possible to use VB to move servos
> > > > , speed, time , and recording this using
> BS2-ic?
> > > > or SSController is better.
> > > >
> > > >
> > > >
> > __________________________________________________
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>
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> > be
> > > ignored.
> > >
> > >
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> > >
> > >
> >
> >
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> >
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> >
>
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Yes, I need to record movements, and if it is
possible the focus.
I am thinking that it similar to a plotter
machine. I think that I could do it whith steppers
and encoders.
Do you know something about that, because a
plotter need to play the recorded instructions.
Thanks: Joe
> --- davemucha@j... wrote:
> > Hi Joe,
> >
> > I'm not sure what you mean by recording and
> playing
> > back movements ?
> >
> > I sorta-kinda assumed that you would look right,
> > measure distance, look left, measure distance and
> as
> > long as you were say, a foot or mor from an
> object,
> > you would make no coruse correction.
> alternaitvely
> > you could subtract the right from the left and
> > center the path movement.
> >
> > can you fill me in on what movements you are
> trying
> > to record ?
> >
> > Dave
> >
> >
> >
> >
> >
> >
Joe Terk <joeterk@y...> writes:
> >
> > From: Joe Terk <joeterk@y...>
> > To: davemucha@j...
> > Subject: Re: [noparse][[/noparse]basicstamps] Re: Pan / Tilt camera
> > using 2 servos (or steppers)+ BS2-IC (help)+ ?
> > Date: Wed, 20 Nov 2002 07:04:24 -0800 (PST)
> >
> > Thanks Dave:
> >
> > Yes, steppers could be better.
> > I understand the feedback , but
> > any idea about how can I record and
> > play movements later. ?
> >
> > Many thanks : Joe
> >
> > --- Dave Mucha <davemucha@j...> wrote:
> > > I see two options pretty quickly.
> > >
> > > use some feedback such as a potentiometer or
> > encoder
> > > to record
> > > movement.
> > >
> > > use a stepper as the motor.
> > >
> > > I think the stepper might be easier as you would
> > > need an H-bridge for
> > > the fwd and rev movements and the stepper would
> > need
> > > a dual H-bridge
> > > for each motor. and Allegro has stepper chips
> for
> > > small steppers.
> > >
> > > Remember, a stepper SHOULD be driven at between
> 5
> > > and 20 times
> > > nameplave voltage, but no more than nameplate
> > > current. and if you
> > > take a uni-polar and drive it in bi-polar, full
> > > winding mode, you
> > > only need half the current to get the same power
> > > output.
> > >
> > > If you salvage some mini-steppers from an old
> > > printer, you may be
> > > able to use a darlington. a UNL2803 (8
> circuits)
> > > could handle one
> > > (low power) motor and it has clamping doides to
> > > eleminate the high
> > > voltage spike that is created on every step as
> the
> > > magnetic files
> > > colapses.
> > >
> > > Dave
> > >
> > >
> > >
> > >
> > > --- In basicstamps@y..., Joe Terk <joeterk@y...>
> > > wrote:
> > > > Help:
> > > >
> > > > We need to move a camera and record
> > > > the pan & tilt moves, because we
> > > > need to repeat the same movements.
> > > >
> > > >
> > > > Servos, must be modified ?
> > > >
> > > > Pan / Tilt must be without vibrations.
> > > > Any Idea.
> > > >
> > > > Thanks : JOE
> > > > PS: Is it better the SSC
> > > > PS2: Is it possible to use VB to move servos
> > > > , speed, time , and recording this using
> BS2-ic?
> > > > or SSController is better.
> > > >
> > > >
> > > >
> > __________________________________________________
> > > > Do you Yahoo!?
> > > > Faith Hill - Exclusive Performances, Videos &
> > More
> > > > http://faith.yahoo.com
> > >
> > >
> > > 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/
> > >
> > >
> >
> >
> > __________________________________________________
> > Do you Yahoo!?
> > Yahoo! Web Hosting - Let the expert host your site
> > http://webhosting.yahoo.com
> >
> >
> >
> >
> >
> >
>
________________________________________________________________
> > Simplify your life.
> > Juno Internet gives you FREE E-mail on the Web!
> > Visit www.juno.com today.
>
>
> __________________________________________________
> Do you Yahoo!?
> Yahoo! Mail Plus – Powerful. Affordable. Sign up
> now.
> http://mailplus.yahoo.com
>
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