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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Well, if you were at he RBNO today, you
should have seen my robotic arm made of VEX parts (I’m a big fan of VEX).
Anyways, I was wondering if somebody will donate a pico-ITX (used or new)
motherboard. If not, a nano-ITX of an operating clock speed of at least 1
gHz. And/or, a compact flash drive to IDE adapter would be useful too. There’s
no need to donate a power supply; I salvaged some working parts to repair one
that just broke from my computer and I rigged it up to have a on/off switch. Also,
from today RBNO, I still have some minor questions. Does anyone know of an
avalanche photodiode with a peak sensitivity wavelength of 650nm or 850nm and
with fast response times? Does anyone know where to find some? How should I
arrange the op-amps (if any should be used) to keep the delay (from input of
the circuit to the output) minimal and with fast response times? Does anyone
have programming knowledge in C++ so I can make an executable to load into the
ITX board to communicate with the serial or Ethernet port? On my report of my
project, I will be putting DPRG in my credits :) . </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'>___________________<br>
Ray Xu<br>
<a href="mailto:rayxu@tx.rr.com" target="_blank">rayxu@tx.rr.com</a><br>
<a href="http://www.dprg.org" target="_blank">DPRG</a> member<br>
<a href="http://tech.groups.yahoo.com/group/oopic/" target="_blank">OOPic</a>
group member<br>
<a href="http://tech.groups.yahoo.com/group/SeattleRobotics/" target="_blank">Seattle
Robotics</a> group member<br>
<a href="http://rayxublogs.blogspot.com/" target="_blank">My Blog</a><br>
</span></font><font size=1 color=navy face=Arial><span style='font-size:8.0pt;
font-family:Arial;color:navy'>Custom HTML generated signature upon sending</span></font><font
color=navy face=Arial><span style='font-family:Arial;color:navy'> </span></font></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> dprglist-bounces@dprg.org
[mailto:dprglist-bounces@dprg.org] <b><span style='font-weight:bold'>On Behalf
Of </span></b>ray xu<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, July 08, 2008 6:02
PM<br>
<b><span style='font-weight:bold'>To:</span></b> </span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>dprglist@dprg.org</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [DPRG]Wall-E ->
1GHZ computers laser rangefinding</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Im going to be at
7/8/2008 RBNO to discuss the laser range finder, discuss about the ultrasonic
ranger “final product”, and to show my robotic arm that I built just before
school ended.</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=navy face=Arial><span
style='font-size:12.0pt;font-family:Arial;color:navy'>___________________<br>
Ray Xu<br>
<a href="mailto:rayxu@tx.rr.com" target="_blank">rayxu@tx.rr.com</a><br>
<a href="http://www.dprg.org" target="_blank">DPRG</a> member<br>
<a href="http://tech.groups.yahoo.com/group/oopic/" target="_blank">OOPic</a>
group member<br>
<a href="http://tech.groups.yahoo.com/group/SeattleRobotics/" target="_blank">Seattle
Robotics</a> group member<br>
<a href="http://rayxublogs.blogspot.com/" target="_blank">My Blog</a><br>
</span></font><font size=1 color=navy face=Arial><span style='font-size:8.0pt;
font-family:Arial;color:navy'>Custom HTML generated signature upon sending</span></font><font
color=navy face=Arial><span style='font-family:Arial;color:navy'> </span></font></p>
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<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> dprglist-bounces@dprg.org
[mailto:dprglist-bounces@dprg.org] <b><span style='font-weight:bold'>On Behalf
Of </span></b>jdrumm9015@aol.com<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, July 06, 2008 9:23
AM<br>
<b><span style='font-weight:bold'>To:</span></b> dwhall256@gmail.com;
dprglist@dprg.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [DPRG]Wall-E ->
1GHZ computers laser rangefinding</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
1.0in'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Ray,<br>
Wow, time of flight of a photon, that is pretty fast electronics.
Why not get a fancier laser that really emits in one wavelength and one phase
and fire it continiously. Look for the phase shift as the indication of
distance rather then trying to time the flight of a photon. The tradeoff
is you will need a fancier laser that has controlled phase. This is the
idea behind the laser bugs. They shine a laser on a window and monitor
the small movements of the window caused by talking by monitoring the phase
shift of the reflected signal.<br>
<br>
Just another high dollar complex project to implement. :)<br>
<br>
John Drummond<br>
<br>
<br>
-----Original Message-----<br>
From: Dean Hall <dwhall256@gmail.com><br>
To: dprglist@dprg.org<br>
Sent: Fri, 4 Jul 2008 7:34 pm<br>
Subject: Re: [DPRG]Wall-E -> 1GHZ computers laser rangefinding</span></font></p>
<div id="AOLMsgPart_0_76094220-78b8-4d68-9c61-cc32d1b80e1b">
<p class=MsoNormal style='margin-left:1.0in;background:white'><font size=1
color=black face=Tahoma><span style='font-size:9.0pt;font-family:Tahoma;
color:black'>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). <br>
<br>
In the realm of programmable logic, the (fastest, I think) Altera Stratix has a
600 MHz core clock. <br>
<br>
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. <br>
<br>
These guys make laser range finders: <br>
<a href="http://www.opti-logic.com/" target="_blank">http://www.opti-logic.com/</a> <br>
<br>
And wikipedia says: "Less expensive models around 100$/ˆ are emerging from
Bosch with the DLE 50 or Stanley Works with the TLM 100." <br>
(from: <a href="http://en.wikipedia.org/wiki/Laser_rangefinder" target="_blank">http://en.wikipedia.org/wiki/Laser_rangefinder</a>) <br>
<br>
!!Dean <br>
<br>
On Jul 4, 2008, at 18:08 , ray xu wrote: <br>
<br>
> 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. <br>
> <br>
> 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 (<a href="http://www.repairfaq.org/sam/lr/" target="_blank">http://www.repairfaq.org/sam/lr/</a>)
> I came to says that it uses a computer controller. <br>
> <br>
> <br>
> Heres my theory of operation: <br>
> <br>
> 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. <br>
> <br>
> <br>
> ___________________ <br>
> Ray Xu <br>
> <a href="mailto:rayxu@tx.rr.com">rayxu@tx.rr.com</a> <br>
> DPRG member <br>
> OOPic group member <br>
> Seattle Robotics group member <br>
> My Blog <br>
> Custom HTML generated signature upon sending <br>
> <br>
> -----Original Message----- <br>
> From: <a href="mailto:dprglist-bounces@dprg.org">dprglist-bounces@dprg.org</a>
[<a href="mailto:dprglist-bounces@dprg.org?">mailto:dprglist-bounces@dprg.org</a>]
> On Behalf Of <a href="mailto:DeltaGraph@aol.com">DeltaGraph@aol.com</a> <br>
> Sent: Friday, July 04, 2008 2:59 PM <br>
> To: <a href="mailto:dwhall256@gmail.com">dwhall256@gmail.com</a>; <a
href="mailto:dprglist@dprg.org">dprglist@dprg.org</a> <br>
> Subject: Re: [DPRG]Wall-E -> 1GHZ computers laser rangefinding <br>
> <br>
> <br>
> Dean / Ray <br>
> <br>
> <br>
> Dean,Good point on Ray's project. <br>
> <br>
> I guess the question is to find out what you are trying to do, Ray. <br>
> <br>
> <br>
> 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. <br>
> <br>
> <br>
> Reference designs are a good place to start. <br>
> <br>
> <br>
> Yeah, breadboarding in this range would be out. <br>
> <br>
> <br>
> 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. <br>
> <br>
> <br>
> <br>
> <br>
> Ron <br>
> <br>
> <br>
> <br>
> Gas prices getting you down? Search AOL Autos for fuel-efficient > used
cars. <br>
> <br>
> No virus found in this incoming message. <br>
> Checked by AVG - <a href="http://www.avg.com/" target="_blank">http://www.avg.com</a> <br>
> Version: 8.0.135 / Virus Database: 270.4.5/1533 - Release Date: >
7/3/2008 7:19 PM <br>
> <br>
> _______________________________________________ <br>
> DPRGlist mailing list <br>
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> <a href="http://list.dprg.org/mailman/listinfo/dprglist" target="_blank">http://list.dprg.org/mailman/listinfo/dprglist</a> <br>
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