[dorkbotsea-blabber] Looking for help with a motor controller circuit (or a cheap full-rotation servo)

[Steve Greenfield]

How about stepper motors, with a photo interruptor "zero" point
that it finds when first turned on? It can also check when
rotating, although as long as no one can touch the heads, they
should not slip a step.

Steve Greenfield

--- claude <bronzenose at hotmail.com> wrote:

> I am working on a sculpture in which 25 to 100 rotating robot
> heads will
> watch passers by.  I have finished a preparatory sculpture with
> four heads
> which watch TV, you can see it here (1 minute long):
> http://www.youtube.com/watch?v=1cCMXl3k1sA
> That one used hobby R/C servo motors and a phidget controller.
> The problems I need to fix for the next sculpture are:
> 	(1) Hobby servos (generally) turn only up to about 180 degrees*.
>  I
> need more than, say, one and a half complete revolutions, but
> preferably
> arbitrarily many revolutions /without losing absolute
> positioning/**.
> 	(2) I need to control many, many more devices.
>