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	<title>the blixtra blog &#187; school</title>
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	<link>http://blixtra.org/blog</link>
	<description>Whoopie! You&#039;ve reached Chris Kühl&#039;s blog</description>
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		<title>Senior Design Project</title>
		<link>http://blixtra.org/blog/2010/04/14/senior-design-project/</link>
		<comments>http://blixtra.org/blog/2010/04/14/senior-design-project/#comments</comments>
		<pubDate>Thu, 15 Apr 2010 06:18:03 +0000</pubDate>
		<dc:creator>Chris</dc:creator>
				<category><![CDATA[avr]]></category>
		<category><![CDATA[qt]]></category>
		<category><![CDATA[school]]></category>

		<guid isPermaLink="false">http://blixtra.org/blog/?p=209</guid>
		<description><![CDATA[In order to graduate from the Engineering program at San Diego State University, each student needs to complete a senior design project with a team of between 6 to 10 students. The group that I&#8217;m apart of is working on building a system to localize nodes in a wireless sensor network (WSN). We do this [...]]]></description>
			<content:encoded><![CDATA[<p>In order to graduate from the Engineering program at San Diego State University, each student needs to complete a senior design project with a team of between 6 to 10 students. The group that I&#8217;m apart of is working on building a system to localize nodes in a wireless sensor network (WSN). We do this by using signal strength and, when nodes are in line of sight of each other, ultrasonic transducers to measure the time difference of the received ultrasonic signal and the radio signal. This is a problem that has been tackled many times and I&#8217;m pretty sure we won&#8217;t be able to come up with anything novel in the short time we have, but the task of building the working system is what is important.</p>
<div id="attachment_211" class="wp-caption aligncenter" style="width: 310px"><a href="http://blixtra.org/blog/wp-content/uploads/2010/04/PinPointProtoBoard.jpg"><img src="http://blixtra.org/blog/wp-content/uploads/2010/04/PinPointProtoBoard-300x225.jpg" alt="Partially populated node rototype board" title="Prototype board" width="300" height="225" class="size-medium wp-image-211" /></a><p class="wp-caption-text">Partially populated prototype board</p></div>
<p>I&#8217;m in charge of building the GUI and integrating the software side of the system. For the GUI I&#8217;m using Qt. I&#8217;ve used this before and found it pleasant enough although I still run into issues that cause me to waste more time than I&#8217;d like. The most important thing for me was that Qt is cross-platform and has great documentation. Having some high-profile applications such as Google Earth and Skype using it makes it easier to &#8220;sell&#8221; to the other team members as well.</p>
<p>For the WSN we chose Atmel Zigbit modules. These have a ZigBee wireless chip and an ATMEGA128 microcontroller embedded within. This module was chosen because much of the difficult circuitry was taken care of, previous good experiences with AVRs, and the low-cost of the hardware and development tools. Thus far we&#8217;ve created custom PCB&#8217;s to hold the Zigbit modules, a pair of ultrasonic transducers, and the accompanying circuitry. We are currently testing those so that we can get about 20 boards professionally made.</p>
<p>We&#8217;ve got less than a month to finish up and are working feverishly to get everything brought together and integrated. With luck we&#8217;ll have a working system in a couple of weeks.</p>
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		<title>San Diego State University Writing Proficiency Assessment</title>
		<link>http://blixtra.org/blog/2009/04/11/san-diego-state-university-writing-proficiency-assessment/</link>
		<comments>http://blixtra.org/blog/2009/04/11/san-diego-state-university-writing-proficiency-assessment/#comments</comments>
		<pubDate>Sat, 11 Apr 2009 19:38:19 +0000</pubDate>
		<dc:creator>Chris</dc:creator>
				<category><![CDATA[school]]></category>

		<guid isPermaLink="false">http://blixtra.org/blog/2009/04/11/san-diego-state-university-writing-proficiency-assessment/</guid>
		<description><![CDATA[Just got out of the SDSU WPA. Left early because I really didn&#8217;t think I could do better than my last score with the reading they provided. The reading they gave was actually from Science Daily which is a site I visit quite often. I don&#8217;t, however think it was that great for the WPA. [...]]]></description>
			<content:encoded><![CDATA[<p>Just got out of the <a href="http://www.sa.sdsu.edu/testofc/gradwriting_reqs.htm">SDSU WPA</a>. Left early because I really didn&#8217;t think I could do better than my last score with the reading they provided. The reading they gave was actually from <a href="http://www.sciencedaily.com">Science Daily</a> which is a site I visit quite often. I don&#8217;t, however think it was that great for the WPA. The actual article was <a href="http://www.sciencedaily.com/releases/2009/01/090128092341.htm">&#8220;Is Technology Producing A Decline In Critical Thinking And Analysis?&#8221;</a></p>
<p>The last time I took the WPA I found the article to be quite good to analyze. It was something about military wives not being able to have careers because the are forced to move around so often.</p>
<p>I&#8217;ll just take my upper-division &#8220;W&#8221; course this summer and get it over. May be a nice break from all my engineering classes.</p>
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		<item>
		<title>Vada</title>
		<link>http://blixtra.org/blog/2008/09/26/vada/</link>
		<comments>http://blixtra.org/blog/2008/09/26/vada/#comments</comments>
		<pubDate>Fri, 26 Sep 2008 06:02:13 +0000</pubDate>
		<dc:creator>Chris</dc:creator>
				<category><![CDATA[family]]></category>
		<category><![CDATA[school]]></category>

		<guid isPermaLink="false">http://blixtra.org/blog/2008/09/26/vada/</guid>
		<description><![CDATA[Btw, my daughter was born on May 31, 2008. Her name is Vada and she is wonderful. She sleeps all night and spreads joy and poop everywhere she goes. I&#8217;m now at San Diego State University majoring in Computer Engineering and taking way to many courses for a new father. Gotta get finished, though. Before [...]]]></description>
			<content:encoded><![CDATA[<p>Btw, my daughter was born on May 31, 2008. Her name is Vada and she is wonderful. She sleeps all night and spreads joy and poop everywhere she goes.</p>
<p>I&#8217;m now at <a href="http://www.sdsu.edu/">San Diego State University</a> majoring in <a href="http://electrical.sdsu.edu/">Computer Engineering</a> and taking way to many courses for a new father. Gotta get finished, though.</p>
<p>Before I go&#8230; Something to laugh at. <a href="http://xkcd.com/481/"><img src="http://imgs.xkcd.com/comics/listen_to_yourself.png" alt="xkcd comic" /></a></p>
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		<item>
		<title>Digg.com apparently blocked by San Diego Community College District</title>
		<link>http://blixtra.org/blog/2007/09/07/diggcom-apparently-blocked-by-san-diego-community-college-district/</link>
		<comments>http://blixtra.org/blog/2007/09/07/diggcom-apparently-blocked-by-san-diego-community-college-district/#comments</comments>
		<pubDate>Fri, 07 Sep 2007 20:34:20 +0000</pubDate>
		<dc:creator>Chris</dc:creator>
				<category><![CDATA[general]]></category>
		<category><![CDATA[san diego]]></category>
		<category><![CDATA[school]]></category>

		<guid isPermaLink="false">http://blixtra.org/blog/2007/09/07/diggcom-apparently-blocked-by-san-diego-community-college-district/</guid>
		<description><![CDATA[It appears that digg has been blocked by the San Diego City College District for the last couple weeks. I&#8217;ve tried accessing it from City College and Mesa College with the same result. After a minute or so I get the &#8220;The connection has timed out&#8221; page. I&#8217;ve not tried it from Miramar. Other sites [...]]]></description>
			<content:encoded><![CDATA[<p>It appears that <a href="http://digg.com/">digg </a>has been blocked by the <a href="http://www.sdccd.edu/">San Diego City College District</a> for the last couple weeks. I&#8217;ve tried accessing it from <a href="http://www.sdcity.edu/">City College</a> and <a href="http://www.sdmesa.edu/">Mesa College</a> with the same result. After a minute or so I get the &#8220;The connection has timed out&#8221; page. I&#8217;ve not tried it from <a href="http://www.miramarcollege.net/">Miramar</a>.</p>
<p>Other sites that are a lot less informative are still accessible: <a href="http://en.wikipedia.org/wiki/YouTube">Youtube</a>, <a href="http://en.wikipedia.org/wiki/MySpace">MySpace</a>, <a href="http://en.wikipedia.org/wiki/Facebook">Facebook</a>, etc.</p>
<p>Of course, getting around the block is trivial. Just find a free <a href="http://en.wikipedia.org/wiki/Proxy_bypass#Web_proxy">proxy site</a> and read <a href="http://en.wikipedia.org/wiki/Digg">digg</a> all you want. Unfortunately, digging doesn&#8217;t seem to work. <img src='http://blixtra.org/blog/wp-includes/images/smilies/icon_sad.gif' alt=':(' class='wp-smiley' /> </p>
<p>Update: <a href="http://digg.com/security/Digg_seems_to_be_blocked_within_the_San_Diego_City_College_District">digg it!</a></p>
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]]></content:encoded>
			<wfw:commentRss>http://blixtra.org/blog/2007/09/07/diggcom-apparently-blocked-by-san-diego-community-college-district/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
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		<title>2007 Autonomous Underwater Vehicle Competition</title>
		<link>http://blixtra.org/blog/2007/07/19/2007-autonomous-underwater-vehicle-competition/</link>
		<comments>http://blixtra.org/blog/2007/07/19/2007-autonomous-underwater-vehicle-competition/#comments</comments>
		<pubDate>Wed, 18 Jul 2007 23:27:17 +0000</pubDate>
		<dc:creator>Chris</dc:creator>
				<category><![CDATA[auv]]></category>
		<category><![CDATA[robotics]]></category>
		<category><![CDATA[san diego]]></category>
		<category><![CDATA[school]]></category>

		<guid isPermaLink="false">http://blixtra.org/blog/2007/07/19/2007-autonomous-underwater-vehicle-competition/</guid>
		<description><![CDATA[Update: We actually placed 9th out of 27 teams. There was an error in the tabulation of the final scores stating we placed 11th. This will soon be changed on the competition website. This year I and some friends from San Diego City College Robotics Engineering Club took part in the AUV Competition here in [...]]]></description>
			<content:encoded><![CDATA[<p><em><strong>Update:</strong> We actually placed 9th out of 27 teams. There was an error in the tabulation of the final scores stating we placed 11th. This will soon be changed on the competition website.</em></p>
<p>This year I and some friends from <a href="http://sdcrobotics.org">San Diego City College Robotics Engineering Club</a> took part in the <a href="http://www.auvsi.org/competitions/water.cfm">AUV Competition</a> here in San Diego. For the uninitiated, this is an international event that has some of the top engineering schools in the country, and a few abroad, competing against each other. The goal is to build an autonomous vehicle that can navigate an underwater course and carry out specified tasks.</p>
<p>This year our entry, The Seahorse, did extremely well. While the final results have not yet been posted we heard from a good course that we were 11th out of 28. This is exceptional considering that the entries that placed around us had about $20,000 invested in their subs while we spent about $3,000. Additionally, we won the award for Most Improved entry. This year we easily passed through the gate almost every single time and came within inches of surfacing in the octagon several times. We are currently planning for next years event and are confident that we can place even higher.</p>
<p>Our team has also severed ties with <a href="http://pacificnautilus.org/">Pacific Nautilus</a>. After the close of the event, Chris Carter, who <strong>IS</strong> Pacific Nautilus, tried to usurp control of the sub although <a href="http://www.sdcity.edu/">City College</a> and our various team members have receipts for almost every part. After a slight altercation, the sub was taken by the event coordinators. Our Dean of Engineering contacted the event coordinators and the sub is, or very soon will be back in the hands of the school. Thus, it will be available to us for next year&#8217;s event. The one or two parts that may belong to Pacific Nautilus will be returned once ownership is clear.</p>
<p>Unfortunately, the products that our sponsors donated &#8211; the custom-made hydrophones and titanium underwater camera &#8211; are currently in the possession of Chris Carter/Pacific Nautilus. We will soon be in contact with said sponsors in order to let them know what has happened to the products that they intended for the team.</p>
<p>This is the second year in a row that Chris Carter has lost an entire team. The other team reformed as <a href="http://www.sdibotics.org/index.cfm">San Diego iBotics</a> and competed in this years event as well. Although it is tempting to join forces, it is obvious that our teams have differing design philosophies. We do wish to cooperate with them in the future, however.</p>
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