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<title>Sawdust GPS Feed</title><link>http://sawdust.see-do.org/index.html</link><description>Projects related to GPS</description><dc:language>en</dc:language><dc:creator>landon@360vl.com</dc:creator><dc:rights>Copyright (C) 2007 Landon Cox</dc:rights><dc:date>2007-05-24T12:01:58-06:00</dc:date><admin:generatorAgent rdf:resource="http://www.realmacsoftware.com/" />
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<lastBuildDate>Tue, 08 Jul 2008 10:10:29 -0600</lastBuildDate><item><title>Next Prototype of XBee GPS</title><dc:creator>landon@360vl.com</dc:creator><category>XBee - SirfIII</category><dc:date>2007-05-24T12:01:58-06:00</dc:date><link>http://sawdust.see-do.org/gps/files/XBee-GPS-SirfIII.html#unique-entry-id-1</link><guid isPermaLink="true">http://sawdust.see-do.org/gps/files/XBee-GPS-SirfIII.html#unique-entry-id-1</guid><content:encoded><![CDATA[In my office, which is on a northwest corner of my house, even with an external GPS antenna, I could rarely get it to lock on.  


...This regulator has only a 300mv max dropout, so there was a lot more headroom starting with a 3.7 battery through a 3.3V regulator than it would be with a standard regulator that has 1.0 to 1.3V dropout.  

...You can clearly see the two end spars that I custom cut with a band saw to give support to the lexan platform of the GPS and to make a compartment for the battery


...The black colored housing connector to the right of the XBee is a custom cable I made which adapted the tiny connector that came with the Sirf III to 0.1" spacing.  ...  I left the end connectors because those will mate with the internal connector of the GPS, but the opposite end I added a 0.1" housing and plugged it into a right-angle header that attached tot he board and provided the interface to the GPS.


...It only took about 10 minutes to make this (get the right crimp tools and parts from Hansen Hobbies) and it finally made access to the Sirf III possible.  ]]></content:encoded></item><item><title>XBee Pro Wireless GPS</title><dc:creator>landon@360vl.com</dc:creator><category>XBee - Copernicus</category><dc:date>2007-04-12T05:27:30-06:00</dc:date><link>http://sawdust.see-do.org/gps/files/9a5a70944c3b16ace418ae2bee1a481d-0.html#unique-entry-id-0</link><guid isPermaLink="true">http://sawdust.see-do.org/gps/files/9a5a70944c3b16ace418ae2bee1a481d-0.html#unique-entry-id-0</guid><content:encoded><![CDATA[I use it because my office doesn't get a good GPS signal, so I can set this little gizmo up on the south side where the GPS signal is good and spit the NMEA strings to my office.  

...On a fresh set of alkaline AA's, this will run non-stop at the normal 1Hz rate of the GPS for about 2.5 hrs.  ...  When you add this whole thing to an AVR MT 128, you get another 50mA or so, and the whole package takes about 150mA.


I recently bought some Nickel Metal Hydride AA's that I'll test out to see what their endurance is.  

...This little fella has been useful enough to me that I'll probably take it off the breadboard and wirewrap it on some protoboard.    Maybe someday I'll use this basic design to try my hand at designing a printed circuit board for it.  ]]></content:encoded></item></channel>
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