[oopic] Re: Stepper Motor and Driver Setup Issues

Here is a sample of my ramping program. The program that I tested to
travel x steps is basically identical to the one in oopic
documentation for oStepper object.

oStepper stepper = New oStepper

Void Main(Void) {
stepper.IOPack = 3
stepper.Mode = 1
stepper.Rate = 125
stepper.Operate = 1
stepper.Rate = stepper.Rate - 15

For (Int x = 1; x < 15;x++) {
stepper.Rate = stepper.Rate + 1
}

}

--- In oopic@yahoogroups.com, Andrew Porrett <slicerwizard@...> wrote:
>
> No code = no answer. Sorry.
>
> At 09:24 PM 11/21/2007, turgrid wrote:
> >I am working with the OOPic-R board (revision C1.x+) and compiler
> >6.1.1. I have wired, I believe correctly, a bipolar stepper motor (<a
>
>href="http://anaheimautomation.com/manuals/L010174%20-%2017Y%20Series%20Spec%20Sheet.pdf">link</a>)
> >to an l298 driver (<a
> >href="http://www.solarbotics.com/products/k_cmd/">link</a>).
> >
> >The behavior I experience was this: Sometimes (w/ regularity) the
> >stator of the stepper motor is in-between coils to start with and
> >fails to start spinning without some small assistance. To avoid this,
> >I was told to reduce the frequency initially and then ramp it up to
> >desired speed to "unstick" it.
> >
> >In attempting to accelerate the stepper motor I have encountered
> >several issues (somewhat hard to describe). The motor only appears to
> >run at three rates (specified by rate property of oStepper object) -
> >123, 124, and 125. This is problem #1. Why does the stepper run at
> >so few frequencies? When I write a program to ramp up the rate
> >property (via simple loop), I run into one of two issues. 1) The
> >whole ramping has no effect and sometimes the motor starts, while
> >other times it needs a little boost; 2) As far as I can tell the
> >program gets stuck at one of the initial rates specified (of which the
> >motor will only vibrate on) and continues to restart and continue
> >looping. I am unable to discern this weird program flow and why it
> >sometimes starts thrashing.
> >
> >This bizarre program flow has really stumped me. When it gets in one
> >of its moods, I am unable to send programs to it, the oopic appears to
> >lock up and/or restart and keep looping. Further, if I tell the
> >stepper to go x number of steps the program loops and stutters
> >in-between iterations. Why such unwanted behavior?
> >
> >Any thoughts, suggestions, or clarification questions would be greatly
> >appreciated. If you need code, let me know...I played with it so much
> >I will have to find something to post. Thanks in advance.
>

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