Subject:
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Re: Stepper Motor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 15 Feb 1999 21:59:17 GMT
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Original-From:
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Jeroen van der Vegt <a.j.vandervegt@its.SAYNOTOSPAMtudelft.nl>
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Viewed:
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1380 times
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Keith,
I've succesfully connected two steppermotors from old diskdrives to the HB,
one 1.8 degrees and one even 0.9 degrees/step.
I found all the info I needed on the internet, and especially
www.cctc.demon.co.uk/stepper.htm contains some useful information (not only
on stepper motors!), including IC-code to control a steppermotor with the
HB. I optimized the code found there, and was able to make 1 rotation within
a second with the 1.8 degrees/step steppermotor.
I found the main problem to be how to connect the differend wires to the
motor outputs. My 1.8 degrees motor has a brown, a black, a orange and a
yellow wire, and I connected them in this order from the RJ11 connection on
the HB down to the start button, using only motoroutputs 0 and 1, so I can
connect an other steppermotor to the outputs for motor 2 an 3. I have
SN754410 motor drivers chips, and I don't know what will happen if you use
the standard chip's.
BTW, using software to control steppermotors at a high speed uses quite a
lot of processor power. Also, you can only connect two steppermotors to your
HB this way. I think using seperate steppermotor driver IC's would be
better, but I haven't had time to test one yet :-(.
Jeroen van der Vegt.
-----Original Message-----
From: Keith <lectro@acadiacom.net>
To: handyboard@media.mit.edu <handyboard@media.mit.edu>
Date: zondag 14 februari 1999 19:51
Subject: Re: Stepper Motor
>
> I am also trying to use steppers motors from an old floppy, if anyone has
> accompished this I am interested in your result and methods
>
> Keith
>
> At 03:33 PM 2/14/99 +0000, you wrote:
> > Hi!
> >
> > > I have a question. Can i use stepper motors to drive my robot platform ?
> >
> > I don't have any experience in robots, but I've mounted a positioning
> > system for a current transformer tap selector using the HandyBoard.
> >
> > > Do i need a gear ?
> >
> > Stepper motors are generally strong and can keep the stopped position very
> > well.
> >
> > > I'd like to use stepper motors instead of normal ones, because I would
> > > not need any shaft encoders.
> > > And I think stepper motors do not cause so much noise like normal
> > > motors.
> > > If someone have a idea where (old floppys,etc.) to rip out good (12V/1A)
> > > stepper motors, please mail me.
> >
> > You will find good 1.8 degree stepper motors in old 5 1/4 drives, • generally
> > they are about 160 mA x 12 V. Other source of very good stepper motors are
> > old printers, I've found some incredibly strong ones.
> >
> > > Does someone use stepper motors to drive a robot ?
> > > Are there any arguments against using stepper motors to drive ?
> >
> > Simon, please keep me in touch of your progress, I'd like to mount my • first
> > mobile robot and I have lots of stepper motors right here... We can swap
> > HandyBoard code too.
> >
> > Best regards,
> > Cesar
>
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