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

Subject: [DPRG]Wall-E -> 1GHZ computers laser rangefinding
From: Dean Hall dwhall256 at gmail.com
Date: Sat Jul 5 12:32:51 CDT 2008

I was introduced to ECL in 1998 and haven't seen it since.  I knew it  
would have been a candidate because of its speed, but I couldn't  
recall the name of the family.  Thanks for pointing it out and  
reminding me.

!!Dean

On Jul 5, 2008, at 11:44 , ray xu wrote:

> Well if you search "counters" on onsemi, there are results of some  
> counters
> that have an fmax of over 1 gHz.  The only problem with that is  
> that I don't
> know how to solder SMD parts, they are rare to find, and also I  
> remember
> saying that working with frequencies above 20mHz on bread board is  
> ugly.
>
> ______________
> 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: Saturday, July 05, 2008 11:14 AM
> To: dprglist at dprg.org
> Subject: Re: [DPRG]Wall-E -> 1GHZ computers laser rangefinding
>
> I'm not aware of any commercially available counters that operate at
> that speed.  Are you?  The fastest logic families I've seen top out
> around 2-4 ns switching which is 3 orders of magnitude too slow.
>
> !!Dean
>
>
> On Jul 5, 2008, at 10:50 , Rud Merriam wrote:
>
>> Hi,
>>
>> The CPU does not need to run at 1 GHz for this situation. Only the
>> counter needs to run at high speed and accept interrupts that start
>> and stop the counter. A separate counter chip is my suggestion.
>>
>> 1. Start the counter and the light pulse.
>> 2. When the light pulse returns turn off the counter.
>> 3. Read the counter when convenient.
>>
>> Rud Merriam K5RUD
>> ARES AEC Montgomery County, TX
>> http://TheHamNetwork.net
>>
>> -----Original Message-----
>> From: ray xu [mailto:rayxu at tx.rr.com]
>> Sent: Friday, July 04, 2008 7:08 PM
>> To: dprglist at dprg.org
>> Subject: RE: [DPRG]Wall-E -> 1GHZ computers laser rangefinding
>>
>> 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.
>>
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>> 7/3/2008 7:19 PM
>>
>>
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