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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