[simpits-tech] phidgits + Building Gauges

[Gene Buckle]

See!  If you talk about him enough, he shows up. :)

g.


On Fri, 25 Oct 2002, fitchett wrote:

>
> That's a remarkable idea.  Photo Interrupters are cheap like borscht.
> (sp?)  H21A1-ND from digikey is an example.  I've heard of stepper motors
> with these integrated, but have never seen one.
>
> Chester
>
> > There's a small electronic device called a Photo Interrupter (PI) that could
> > be used. This consists of an IR LED (Infra Red) on one side and a
> > photo-transistor on the other. These are used in printers to indicate where
> > the carriage is. All you need to do is put a small piece of plastic on the
> > shaft of the stepper motor and each time this plastic piece passes between
> > the two parts of the PI it cuts the IR to the transistor and signals the
> > controller (PC, Basic Stamp, Phidgit etc) that the motor has turned one
> > revolution. If you could set up a counting program then you keep track of
> > the revolutions and hence the start point and any number of other points
> > too.
> > I got hold of a heap of old printers and stripped them of these devices and
> > the stepper motors - ready for this sort of thing.
> > Can anyone add to this theory ?
> > Rod
> > ----- Original Message -----
> > From: Roy Coates <roy@flightlab.liv.ac.uk>
> > To: <simpits-tech@simpits.org>
> > Sent: Friday, October 25, 2002 5:34 AM
> > Subject: Re: [simpits-tech] phidgits + Building Guages
> >
> >
> > > On Thu, 24 Oct 2002 mysticz28@swbell.net wrote:
> > >
> > > > Gene Buckle wrote:
> > > > >
> > > > > The problem is that everyone and their brother has a neat method of
> > > > > driving a stepper motor, but nobody says anything about *feedback*
> > from
> > > > > that motor.
> > > >
> > > > That's because steppers can't talk back (or they would be servos).
> > > > Fortunately for them, you talk enough to take up their slack ;)
> > > >
> > >
> > > I was led to believe that you CAN get feedback from a stepper.
> > >
> > > Roy.
> > >
> > >
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