Hi Dwayne-

I have done a rough cut, but that's all.  So I would be interested in your
solution.  What I did is calculate the distance in steps from the starting, or
stopping, point and use the distance to modify the rate.  So, for instance,
RATE = (HERE-START)*2+1.  The nice thing about this is, it lets you calculate
the deceleration so you stop in a certain place.  Ie: RATE = MIN( MAXRATE,
(HERE-START)*2+1, (STOP-HERE)*2).   Note, the last expression will be zero when
it reaches the destination, while the +1 in the first expression lets it start
from the start position.

(gee thanks Dwayne, I have now stated it clearly for myself :-)

I am doing this for a turntable, so I have to worry about signs and stuff.

David H

Dwayne Reid wrote:

> Good day to all.
>
> I am about to start a hobby project using a single standard stepper motor
> that moves a specified number of steps each time it is triggered.  Easy, so
> far.  But I'd like to add acceleration and deceleration ramps.  Not too
> hard, really.  But before I get into it, I thought I'd check to see if
> someone has seen something like this already done.
>
> dwayne
>
> Dwayne Reid   <dwayner@planet.eon.net>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> (780) 489-3199 voice          (780) 487-6397 fax
>
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