Re: 3D Scanner/ Dizitizer

Hello,

In this case the 8 bit ADC is built into the part...

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "george_barr"
<george_barr@y...> wrote:

> Can't you use a more accurate ADC like a 12bit ADC to get better
> digitizer accuracy?
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...>
> wrote:
> > Hello,
> >
> > The range of this device is 10-80 CM. And the output is 0-255

(8bit

> > ADC), so that's about .275" per bit. Pretty coarse...
> >
> > Hope this helps,
> >
> > Ballendo
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "caudlet" <info@t...>

wrote:

> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ruanb1"

<rrbasson@t...>

> > > wrote:
> > > > Hi Guys
> > > >
> > > > Just an idea, I am thinking off. It sure would be nice to be
> able
> > > to
> > > > have a scanning system (affordable) without the contact like
> the
> > > > probes.
> > > >
> > > > I was thinking: Can one not use the distance sensors (which

is

> > > > cheap) mounted on the axes to fulfill this, I mean we

basically

> > > > would just like distances, and with software then create the
> > > > models???
> > > >
> > > > Have any of you thought in this line or build something like
> this
> > > on
> > > > your CNC machines?
> > > >
> > > > It surely would not break the bank (although it might be hell
> of
> > > > slow scanning).
> > > >
> > > > Would appreciate your ideas
> > > >
> > > > Regards
> > > >
> > > > Ruan
> > >
> > > Take a look at:
> > >
> > > http://www.hvwtech.com/pages/products_view.asp?ProductID=347
> > >
> > > Infrared (pulsed) short distance sensor. They have several
> > models.
> > > Serial (RS232) output feeds back digital value of analog

distance

> > or
> > > one model has adjustable trip point and just sends back a

single

> > bit
> > > logic level.
> > >
> > > The challenges are to get past the different reflectivity of an
> > > object and to determine the accuracy and repeatability.
> > >
> > > Ambient light is not a problem due to the module having it's

own

> > > infrared output and it being pulsed at a frequency that is
> detected
> > > by the same receiving module. It uses a focused beam and
> receiver
> > at
> > > angles so it can only operate in the area of convergence.
> > >
> > > Price is right (<30 bucks) if it is usable.