Lpc2000

--- The approach i had conceived was to count the time required for a 
pulse to send and return, something i'm somewhat familiar with in 
using hobby ultrasonic transducers. Affordable Ultrasonic equipment 
is usually limited to ~10 meters, too short to be practical for my 
wants.
 I'll google CPLD and FPGA to see what info i can find, thanks for 
that.
 Actually the laser range finder was just an idea of something i 
wanted to build, i've never seen a homebrew version(might be a reason 
for that)and thought it would be interesting.
 One of the reasons i joined this group was to get input from other 
users......Thank you all who replyed.
 Just one more piece of info to anyone who might want to share. Which 
flavor of 2000 might be the most practical for the needs/wants in my 
original post?
 Thanks again...





In lpc2000@yahoogroups.com, "brendanmurphy37" <brendanmurphy37@...> 
wrote:
>
> 
> They're measuring distances of kms, to an acuracy of 6m (still in 
> the 20ns range in terms of time, though).
> 
> As I said, a tough enough job using a standard micro. I think if 
> you're going to use this technique, you'd need some piece of 
> hardware on the front-end with a fast clock driving it to get the 
> kind of acuracy to make it useful. In which case, the speed of the 
> micro isn't too relevant.
> 
> There are other better approaches, I'm sure.
> 
> Brendan
> 
> --- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@> 
> wrote:
> >
> > ----- Original Message ----- 
> > From: "Onestone" <onestone@>
> > To: <lpc2000@yahoogroups.com>
> > Sent: Tuesday, May 16, 2006 3:15 PM
> > Subject: Re: [lpc2000] Re: Hello all....
> > 
> > 
> > >I thought the commercial systems used phase shift to determine 
> distance?
> > > 
> > 
> > Some measure the time for the pulse to return:
> > 
> > http://www.acuityresearch.com/products/ar4000/index.shtml
> > 
> > http://near.jhuapl.edu/fact_sheets/NLR.pdf
> > 
> > Leon
> > ---
> > [This E-mail has been scanned for viruses but it is your 
> responsibility 
> > to maintain up to date anti virus software on the device that you 
> are
> > currently using to read this email. ]
> >
>