Subject:
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Re: Steppers
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 6 Jul 1998 23:24:27 GMT
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Original-From:
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brian-c@technologist.[AvoidSpam]com
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Viewed:
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1137 times
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Dear Terri,
If the motors turn sparatically, that means the coils
are probably not hooked up in the correct order. Try
swapping them around and see if anything improves.
The motors you are using are the bipolar type. There
is a decent way of hooking up unipolar steppers to
the HB at http://www.cctc.demon.co.uk/stepper.htm
A basic difference between bipolar and unipolar is
that unipolar motors have additional wires which are
connected to the power supply. Bipolars also have more
torque.
Using fd(); and bk(); commands to power steppers is
probably a lot to handle. I recommend trying the
method found on that link. There's even sample coding.
You will have to modify some variables for the turn
functions because your turning radius varies according
to your distance between motors.
I modified the step(); function to produce a gradual
increase in speed, and a gradual decrease in speed once
the specified steps are almost complete.
I will attach my motors.c file as is.
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Brian Carvalho [ brian-c@ieee.org ]
DeVRY Institute
New Jersey
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