On Sun, 28 Jul 2002 19:35, you wrote:
> Katinka Mills wrote:
> > Only need one per motor, but one of my designs has 18 steppers in it :o)
>
> Sounds interesting. There is a simple way to do
> CC linear driving without using the CC source at the
> top. My new driver does it like this with the 4 cheap
> transistors doing both the phase switching AND the
> linear CC control. What current/speed etc needs do
> your motors have, and if you don't mind me asking
> what type of project needs 18 steppers? A motorised
> solar system maybe?? ;o)
> -Roman

Smart light for disco's :o) I am desiging one atm, it is a challange and a
half, DMX 512 in (250Kbps) then move 18 steppers (1 for pan, 1 for tilt, 1
for focus, 1 for dimmer, 1 for strobe, 3 for colour 4 for gobos (shapped
effects) 4 to rotate each gobo on it wheel, 1 for prism effects (to make 1
-12 coppies of image)

Now I know why pulsar and the other big boys have multiple 8051's, it is fun
updating lots of steppers at once. when I find some decent steppers I will be
laughing, the dynsin (IIRC) ones I got from a Martin 1220 are the best so
far, the ones out of 5 1/4" floppies are next to useless in this project,
they just do not appear to step reliably at high speed.

Oh and to make this all fun, each stepper also has a home opto aswell, need to
know where 0 is when spinning a wheel.

When I finally finish this all I will put the whole thing online (in the next
10 years as it is not a paid job ;o) The case will be the old Martin 1220 as
it was free (thanks to a nightclub who thought they could cover the fans as
they let light out ;o) worked for an hour then the light caught fire (1200
HMI globes tend to run hotter than most cable insulation can stand ;o)

Regards,

Kat.

--
--------------------------------------------------------------------------------------------
K.A.Q. Electronics
Software and Electronic Engineering
Perth, Western Australia
Phone +61 (0) 419 923 731
--------------------------------------------------------------------------------------------

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.