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more help!

ArchiverArchiver Posts: 46,084
edited 2002-10-18 17:56 in General Discussion
>
>
> >
> >
> > alright, I'm on to stepper motors, I have a uni-polar 6 wired stepper
>motor,
> > I understand I need to run my stamp pin through a transistor in order to
> > increase the current, but I'm not sure of the setup, like I don't know
>what
> > wires to connect to on my motor, I know that the 2 reds are common and
>the
> > colours of the different stages, but I don't the know where I connect
>the
> > collector of the transistor, that kinda stuff!
I have to use the transistor way, I cannot use stepper IC's cause this is a
lab for school, and the point is to be able to use it with transistors!
> >
> > so any info would be great!
> >
> > Thanks alot Brad
> >
> >
> >
> >
> >
> >
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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-10-18 03:45
    that chip (ULN2803)is NOT a stepper driver chip, it is
    a high current darlington transistor array. so they
    are still transistors, just in a dip format. i see
    where your lab is going, i just wanted to clarify that
    point. do a google search for "how to drive a
    transistor" or something of that variety, there are
    tons of links, or your EE text books should have many
    examples. here is a nice link, should tell all u need
    to know:
    http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/transwitch.html

    here is a stepper example using the BS1 that gives a
    brief explanation of the "how/why" rather than just
    the code, it is application note #6. i havent played
    with steppers much, perhaps someone else has info to
    share.

    http://www.parallaxinc.com/downloads/Documentation/Basic%20Stamps/BASIC%20Stamp%\
    201%20App%20Notes%20v1.9.pdf

    hope that helps you out,
    ross

    --- Brad Hughson <willkirby69@h...> wrote:
    >> I have to use the transistor way, I cannot use
    > stepper IC's cause this is a
    > lab for school, and the point is to be able to use
    > it with transistors!
    so any info would be great!
    > > >
    > > > Thanks alot Brad
    > > >
    > > >
    > > >
    > > >
    > > >
    > > >
    > > >
    >
    _________________________________________________________________
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  • ArchiverArchiver Posts: 46,084
    edited 2002-10-18 03:53
    Klutch,

    The basic stamp can provide stepper motor drive can't it?
    If so then driving the stepper motor from the stamp would require a device
    (circuit) to provide increased current. This is why I have suggested the
    ULN2803, as it is a damn simple device providing a high current output, that
    is simple to use, ie requiring power, ground and an output from the stamp.
    What do you think?

    Regards,

    Dwain.
    Original Message
    From: "Klutch" <klutch66@y...>
    To: <basicstamps@yahoogroups.com>
    Sent: Friday, October 18, 2002 12:45 PM
    Subject: Re: [noparse][[/noparse]basicstamps] more help!


    > that chip (ULN2803)is NOT a stepper driver chip, it is
    > a high current darlington transistor array. so they
    > are still transistors, just in a dip format. i see
    > where your lab is going, i just wanted to clarify that
    > point. do a google search for "how to drive a
    > transistor" or something of that variety, there are
    > tons of links, or your EE text books should have many
    > examples. here is a nice link, should tell all u need
    > to know:
    > http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/transwitch.html
    >
    > here is a stepper example using the BS1 that gives a
    > brief explanation of the "how/why" rather than just
    > the code, it is application note #6. i havent played
    > with steppers much, perhaps someone else has info to
    > share.
    >
    >
    http://www.parallaxinc.com/downloads/Documentation/Basic%20Stamps/BASIC%20St
    amp%201%20App%20Notes%20v1.9.pdf
    >
    > hope that helps you out,
    > ross
    >
    > --- Brad Hughson <willkirby69@h...> wrote:
    > >> I have to use the transistor way, I cannot use
    > > stepper IC's cause this is a
    > > lab for school, and the point is to be able to use
    > > it with transistors!
    > so any info would be great!
    > > > >
    > > > > Thanks alot Brad
    > > > >
    > > > >
    > > > >
    > > > >
    > > > >
    > > > >
    > > > >
    > >
    > _________________________________________________________________
    > > > > Unlimited Internet access for only $21.95/month.
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  • ArchiverArchiver Posts: 46,084
    edited 2002-10-18 17:56
    yes, i could not agree more, and i would probably use
    the same chip, if teh stepper were sized correctly to
    its current supply abilities. i was merely pointing
    out to Brad Hughson, the originator of teh question,
    that the ULN2803 is not a stepper driver IC like that
    made by Elab, check out www.elabinc.com and the
    EDE1200 or 1204.
    for his lab, he has to just use regular transistors
    like the 2n222 or 2n3904, that was his question on how
    to bias them. i hope that clarifies where i was
    coming from.
    ross


    --- "Dwain J. Hill" <asdfghjk@b...> wrote:
    > Klutch,
    >
    > The basic stamp can provide stepper motor drive
    > can't it?
    > If so then driving the stepper motor from the stamp
    > would require a device
    > (circuit) to provide increased current. This is why
    > I have suggested the
    > ULN2803, as it is a damn simple device providing a
    > high current output, that
    > is simple to use, ie requiring power, ground and an
    > output from the stamp.
    > What do you think?
    >
    > Regards,
    >
    > Dwain.
    >
    Original Message
    > From: "Klutch" <klutch66@y...>
    > To: <basicstamps@yahoogroups.com>
    > Sent: Friday, October 18, 2002 12:45 PM
    > Subject: Re: [noparse][[/noparse]basicstamps] more help!
    >
    >
    > > that chip (ULN2803)is NOT a stepper driver chip,
    > it is
    > > a high current darlington transistor array. so
    > they
    > > are still transistors, just in a dip format. i
    > see
    > > where your lab is going, i just wanted to clarify
    > that
    > > point. do a google search for "how to drive a
    > > transistor" or something of that variety, there
    > are
    > > tons of links, or your EE text books should have
    > many
    > > examples. here is a nice link, should tell all u
    > need
    > > to know:
    > >
    >
    http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/transwitch.html
    > >
    > > here is a stepper example using the BS1 that gives
    > a
    > > brief explanation of the "how/why" rather than
    > just
    > > the code, it is application note #6. i havent
    > played
    > > with steppers much, perhaps someone else has info
    > to
    > > share.
    > >
    > >
    >
    http://www.parallaxinc.com/downloads/Documentation/Basic%20Stamps/BASIC%20St
    > amp%201%20App%20Notes%20v1.9.pdf
    > >
    > > hope that helps you out,
    > > ross
    > >
    > > --- Brad Hughson <willkirby69@h...> wrote:
    > > >> I have to use the transistor way, I cannot use
    > > > stepper IC's cause this is a
    > > > lab for school, and the point is to be able to
    > use
    > > > it with transistors!
    > > so any info would be great!
    > > > > >
    > > > > > Thanks alot Brad
    > > > > >
    > > > > >
    > > > > >
    > > > > >
    > > > > >
    > > > > >
    > > > > >
    > > >
    > >
    >
    _________________________________________________________________
    > > > > > Unlimited Internet access for only
    > $21.95/month.
    > > > Try MSN!
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