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[DPRG]Wall-E -> 1GHZ computers laser rangefinding

Subject: [DPRG]Wall-E -> 1GHZ computers laser rangefinding
From: ray xu rayxu at tx.rr.com
Date: Fri Jul 4 21:23:14 CDT 2008

I think I've settled for the serial port method.  I will be using the
pico-ITX when the entire thing works.  Again, sorry for me accidentally
throwing the subject "WallE" off, I was sort of in a rush and I picked a
random DPRG email and used it as a template.  I hope no one got confused.

______________
Ray Xu
rayxu at tx.rr.com

-----Original Message-----
From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org] On Behalf
Of Dean Hall
Sent: Friday, July 04, 2008 7:34 PM
To: dprglist at dprg.org
Subject: Re: [DPRG]Wall-E -> 1GHZ computers laser rangefinding

Ray, sorry to tell you I am not aware of any commercial-off-the-shelf  
logic device that operates at 1 GHz (1 picosecond period).

In the realm of programmable logic, the (fastest, I think) Altera  
Stratix has a 600 MHz core clock.

The closest thing I can think of is a specialized high-speed  
processor, like the PowerPC 460GT from AMCC.  However, I don't see  
any Timer peripherals, either some serious hacking is in order; or it  
may not even be possible with this device.

These guys make laser range finders:
http://www.opti-logic.com/

And wikipedia says: "Less expensive models around 100$/€ are emerging  
from Bosch with the DLE 50 or Stanley Works with the TLM 100."
(from: http://en.wikipedia.org/wiki/Laser_rangefinder)

!!Dean

On Jul 4, 2008, at 18:08 , ray xu wrote:

> Dean: I see why the breadboard is a bad idea.  All I need from the  
> controller is because I need to interface 1gHz counters to it.
>
> Ron: I am already done with my sonar project.  All I need to do now  
> is to put it on a board and in a project box.  Also, I did some  
> searching, and the closest thing (http://www.repairfaq.org/sam/lr/)  
> I came to says that it uses a computer controller.
>
>
> Heres my theory of operation:
>
> The controller will be instructed to trigger a laser pulse (650 nm  
> laser diode), start a timer/counter, wait for the beam to come back  
> (receiver: OPT101 with concave lens on top of photo-sensitive  
> area), disable the counter/timer, do some calculations, display  
> results, and loop.
>
>
> ___________________
> Ray Xu
> rayxu at tx.rr.com
> DPRG member
> OOPic group member
> Seattle Robotics group member
> My Blog
> Custom HTML generated signature upon sending
>
> -----Original Message-----
> From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org]  
> On Behalf Of DeltaGraph at aol.com
> Sent: Friday, July 04, 2008 2:59 PM
> To: dwhall256 at gmail.com; dprglist at dprg.org
> Subject: Re: [DPRG]Wall-E -> 1GHZ computers laser rangefinding
>
>
> Dean / Ray
>
>
> Dean,Good point on Ray's project.
>
> I guess the question is to find out what you are trying to do, Ray.
>
>
> That is, if you are attempting to measure time of flight of light  
> you may be talking an advanced project where specialized hardware/  
> knowledge might be needed.
>
>
> Reference designs are a good place to start.
>
>
> Yeah, breadboarding   in this range would be out.
>
>
> Might suggest playing with sonar first. You will learn a good deal  
> and sound's propagation rate is 1 millionth the speed of light.  
> Master that first. Just Me Talking.
>
>
>
>
> Ron
>
>
>
> Gas prices getting you down? Search AOL Autos for fuel-efficient  
> used cars.
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.135 / Virus Database: 270.4.5/1533 - Release Date:  
> 7/3/2008 7:19 PM
>
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