Re: Digital Caliper Output

If youhave these, its

CircuitCellar Magazine:
issue41 page60

I'll try to find the article

Lee

--- In CAD_CAM_EDM_DRO@egroups.com, Jon Elson <jmelson@a...> wrote:
>
>
> bcollier@p... wrote:
>
> > I wonder if the half-thou digit toggles between 0 and 5 in real
time.
> > You could tap into the LCD and read, say, the lower left line in
the
> > tenth place. If it is real time, you would get a square wave
pulse,
> > high every half-thou. Any thoughts?
>
> They don't work that way. About 500 times a second, the chip
selects
> one digit
> at a time and sends the 7 segment drive signals to it. Then, it
does
> the next
> digit. Even if what you suggest was how it worked, you would have
lost
> direction of travel information.
>
> Yes, you could pick up all the digits and de-multiplex them, and get
> faster readout
> than the spc port, but I'm not sure it is fast enough, still. But,
> you'd get about
> 60-100 full updates/second.
>
> Jon