http://wiki.paparazziuav.org/w/api.php?action=feedcontributions&user=DonEduardo&feedformat=atomPaparazziUAV - User contributions [en]2024-03-29T07:21:32ZUser contributionsMediaWiki 1.37.1http://wiki.paparazziuav.org/w/index.php?title=NPS&diff=10718NPS2011-11-24T15:58:36Z<p>DonEduardo: /* JSBSim */</p>
<hr />
<div>Booz contains a sensors model and can use [http://jsbsim.sourceforge.net/ Jsbsim] to allow arbitrarily complex flight dynamic models.<br />
<br />
=== Installation ===<br />
<br />
[[Installation|Install]] Paparazzi from source.<br />
<br />
==== JSBSim ====<br />
You can either install the paparazzi jsbsim package<br />
For Natty and later distros (only works for i386. For amd64, it will install, but give you compile errors, try manual install as below):<br />
sudo apt-get install paparazzi-jsbsim<br />
For Maverick and earlier distros<br />
sudo apt-get install jsbsim<br />
'''or''' Compile JSBSIM from the latest source<br />
cvs -z3 -d:pserver:anonymous@jsbsim.cvs.sourceforge.net:/cvsroot/jsbsim co -P JSBSim <br />
cd JSBSim<br />
./autogen.sh<br />
./configure --enable-libraries --enable-shared --prefix=/opt/jsbsim<br />
make<br />
sudo make install<br />
<br />
Remark: I had to download the version dated 2011-07-15, since GetPQRDot() was removed from jsbsim some time ago (Thanks to Dirk Dokter for pointig out this). So you may want to try:<br />
cvs -z3 -d:pserver:anonymous@jsbsim.cvs.sourceforge.net:/cvsroot/jsbsim co -D20110715 -P JSBSim<br />
<br />
Here is an optional ''[[Media:‎Jsbsim silent warnings.patch.gz.jpg|patch]]'' to silent warnings.<br />
<br />
==== Compilation ====<br />
<br />
* Compile paparazzi<br />
cd paparazzi<br />
make<br />
<br />
* Compile the vehicle<br />
make AIRCRAFT=BOOZ2_A1 clean_ac sim<br />
<br />
===Start Simulation===<br />
* Start paparazzi_center if you want click to start programs<br />
./paparazzi<br />
<br />
* Start messages to monitor the middleware activity ( from the tool menu of paparazzi center) or with<br />
./sw/ground_segment/tmtc/messages <br />
<br />
* Start the sim<br />
./var/BOOZ2_A1/sim/simsitl<br />
<br />
You should now see activity in the "messages" window<br />
<br />
* Plot the value of a message field.<br />
start 'plotter' (Real-time plotter from the tool menu of paparazzi center) or with<br />
./sw/logalizer/plotter<br />
for example drag the label 'int32 phi' from the BOOZ2_FP message to the drawing area of the plotter<br />
<br />
<br />
* Use the datalink to change the tlemetry mode<br />
start 'settings' ( from the tool menu of paparazzi center) or with<br />
./sw/ground_segment/tmtc/settings -ac BOOZ2_A1<br />
start 'server' to dispatch datalink messages ( from the tool menu of paparazzi center) or with<br />
./sw/ground_segment/tmtc/server <br />
change the field "telemetry" on the first page to "Att loop" and send by pressing the green check button. THe label on the left or the drop box should change to "Att loop" confirming your essage has been received. "message" should now show that the message "BOOZ2_STAB_ATTITUDE" is received<br />
<br />
* Use flightgear to visualize your vehicle<br />
If you want a view of a quadrotor in flightgear, make a link from<br />
/usr/share/games/FlightGear/Models/Aircraft/paparazzi to PAPARAZZI_SRC/conf/simulator/flightgear/ <br />
sudo ln -s $PAPARAZZI_SRC/conf/simulator/flightgear/ /usr/share/games/FlightGear/Models/Aircraft/paparazzi<br />
start flighgear with<br />
fgfs --fdm=null --native-gui=socket,in,30,,5501,udp --prop:/sim/model/path=Models/Aircraft/paparazzi/mikrokopter.xml<br />
restart your simulator with<br />
./var/BOOZ2_A1/sim/simsitl --fg_host 127.0.0.1<br />
<br />
* Save you session<br />
<br />
==== Troubleshooting ====<br />
* If you get an error like "JSBSim failed to open the configuration file: (null)/conf/simulator/jsbsim/aircraft/BOOZ2_A1.xml", you need to set your $PAPARAZZI_SRC and $PAPARAZZI_HOME environment variables. Add the following to your .bashrc, change paths according to where you put Paparazzi. Open a new terminal and launch the sim again.<br />
export PAPARAZZI_SRC=~/paparazzi<br />
export PAPARAZZI_HOME=~/paparazzi<br />
<br />
* If you did not install the jsbsim package your JSBSim installation under /opt/jsbsim will be used and you will have to set your library path (either in your shell startup file or when running the sim on the command line), e.g.:<br />
LD_LIBRARY_PATH=/opt/jsbsim/lib ./var/BOOZ2_A1/sim/simsitl --fg_host 127.0.0.1<br />
<br />
=== Tunning the attitude control loop ===<br />
<br />
Here we are going to use the simulator to demonstrate a way of tunning the attitude control loop.<br />
<br />
* Restart your previous session<br />
<br />
* Set telemetry mode to "Att loop"<br />
<br />
* Display two real time plotter windows<br />
<br />
In the first one, plot the field "m_phi" from the "BOOZ2_STAB_ATTITUDE" message. This is our estimation of roll angle.<br />
On top of that, plot the field "phi" from the "BOOZ2_STAB_ATTITUDE_REFERENCE" message. This is our reference roll angle, that is, the roll value we are trying to achieve.<br />
<br />
In the second plotter, plot the fields "delta_a_fb" and "delta_a_ff". Those are respectively the feddback and feedforward part of our roll command. The sum of those two terms is what is used as roll command.The feedforward part is the part used to follow our trajectory and the feedback part is the part used to reject perturbations.<br />
<br />
<br />
* In "Settings", go to the "Att Loop" tab<br />
We notice that the vehicle doesn't follow accurately the step trajectory we are trying to make him do.<br />
<br />
Start by setting the value of the proportional gain ('pgain_phi') to 1000 instead of 400. The vehicle now follows the trajectory faster but overshoots. To prevent that, increase the value of the derivative gain ('dgain p') from -300 to -700.<br />
<br />
If you look at the plotter where you're ploting the commands, you'll notice that during steps, the feedback command has to work hard. This means that our feedforward command is badly tunned, and namely not working hard enough.Increase the value of the feedforward gain ('ddgain p') from 300 to 540. You'll notice that now the feedback command has becomed marginal during the steps. This is the right value for the gain. Anything bigger will make the feedback command fight against the feedforward command during steps, anything smaller will make the feedback command have to complement the feedforward command.<br />
<br />
=== Something else ===<br />
<br />
* try starting flightgear with<br />
<br />
fgfs --fdm=null --native-gui=socket,in,30,,5501,udp --prop:/sim/model/path=Models/Aircraft/paparazzi/simple_bipe.xml<br />
<br />
an the sim with<br />
<br />
./var/BOOZ2_A1/sim/simsitl --fg_host 127.0.0.1 --rc_script 1<br />
<br />
== use a joystick ==<br />
<br />
You can use a joystick (or connect your RC transmitter as a joystick) to control the quad in the simulator.<br />
<br />
./var/BOOZ2_A1/sim/simsitl --fg_host 127.0.0.1 --js_dev /dev/input/js0<br />
<br />
Depending on your joystick it might be mapped to some different device (check with dmesg) or have a look in /dev/input/by-id/<your-joystick><br />
<br />
[[Category:Software]] [[Category:User_Documentation]]</div>DonEduardohttp://wiki.paparazziuav.org/w/index.php?title=Eagle_Tips&diff=10695Eagle Tips2011-11-23T16:02:05Z<p>DonEduardo: /* Panels */ Changed to permalink for ubuntu installation, fixed typos</p>
<hr />
<div>The [http://www.cadsoft.de Eagle] CAD drawings and schematics are available from the [[Downloads]] page. A freeware version of Eagle program is available for Linux or Windows that allows for viewing and printing the hardware files.<br />
<br />
== Printing Schematics ==<br />
<br />
Paparazzi schematics were drawn to print on an A4 sheet which is 210mm x 297mm (8.26in x 11.7in). North America uses the Letter size of 8.5in x 11in and will print fine onto two Letter sheets but it is more convenient to print onto a single Letter sized sheet. Below are instructions to do this.<br />
'''From Windows:'''<br />
With the schematic open go to File -> Print and you will see the print dialog<br />
<br />
[[Image:Eagle-print-win32.png]]<br />
<br />
Under STYLE, check off ROTATE, BLACK, and SOLID<br />
<br />
Scale Factor is the important setting and you will want to put 0.65. If it cuts too much off, try lowering this number by 0.1 each time.<br />
<br />
Under sheets check off ''select all'' to print all of the schematic pages 'or' select ''This'' to print the schematic page you were currently looking at.<br />
<br />
== Gerbers ==<br />
The format generally accepted by PCB manufacturers is called gerber and is a collection of individual files representing each layer or aspect of the PCB. The gerber files can be produced using the CAM processor of Eagle. The commands needed for this operation in Linux are contained in the Makefile of the hw directory, and thus typing ''make gerber'' from this directory will produce a set of gerbers.<br />
<br />
The Makefile can also be used to get the CAM processor to generate printable documents for the schematics and implantation of parts (pdf and postcript) . Typing ''make printable'' in the hw directory should do the trick.<br />
<br />
== Panels ==<br />
[[Image:panel.jpg|thumb|Example panel]]<br />
If you're going to have PCBs manufactured, you'll probably want to fit several boards on a sheet. This is called a panel. The paparazzi3/hw/panel directory contains a makefile and some config files that will allow you to do that. It uses the [http://claymore.engineer.gvsu.edu/~steriana/Python/gerbmerge/ gerbmerge] program. See how to install on ubuntu [http://blog.bhargavaz.us/2009/05/installing-gerbmerge-on-ubuntu-linux.html gerbmerge install]. The [http://gerbv.sourceforge.net/ gerbv] program will allow you to check your results.<br />
<br />
After completing the ''layout.cfg'' and ''layout.def'' files in the panel directory, all you have to do is type ''make _panel''. Then, to view the result, ''make _view''<br />
<br style="clear:both"><br />
<br />
== 3D views ==<br />
[[Image:tiny_3d_rendering.jpg|thumb|Eagle 3D rendering]]<br />
3-D renderings can be produced using the [http://www.matwei.de/doku.php?id=en:eagle3d:eagle3d eagle3d] script and the [http://www.povray.org/ povray] raytracer. A copy of this script and associated povray libraries are in the paparazzi3/hw/ulp and paparazzi/hw/povray.<br />
<br />
To produce such a view from the eagle board view click the ulp button and select the paparazzi3/hw/ulp/3d41.ulp script. The script will produce a file usable by povray. Have the script put the generated file in the paparazzi3/hw/povray directory. Then in this directory, issue the following command ''povray tiny.pov'' to have povray generate the image.<br />
<br style="clear:both"><br />
<br />
[[Category:Hardware]] [[Category:Software]] [[Category:Developer_Documentation]]</div>DonEduardohttp://wiki.paparazziuav.org/w/index.php?title=Get_Hardware&diff=10694Get Hardware2011-11-23T15:51:40Z<p>DonEduardo: /* u-Blox GPS receivers */</p>
<hr />
<div>As an open-source project, all source code and hardware plans are [http://svn.savannah.gnu.org/viewvc/paparazzi3/trunk/hw/?root=paparazzi freely available on the SVN Server] for anyone to produce, use, modify, and redistribute in accordance with the [http://www.gnu.org/licenses/gpl.txt GPL License Agreement] which requires only that the open-source nature of the project be maintained by all who redistribute it.<br />
<br />
We encourage the distribution of hardware for profit or otherwise and invite any users with paparazzi-related hardware to post links and purchasing information on this page. Please use the [[Talk:Get_Hardware&action=edit|Discussion Tab]] to describe your experiences with any of these vendors.<br />
<br />
<hr><br />
<br />
<br style="clear:both"><br />
<br style="clear:both"><br />
<br />
= [http://aerofu.com [[image:aerofu_logo.png]] Aerofu.com ] =<br />
<br />
Low cost Paparazzi hardware from Australia. <br />
Licenced to export to [http://aerofu.com/index.php?main_page=page&id=2 33 countries], including Europe and North America. Recentry restocked with:<br />
<ul><br />
<li><br />
[http://www.aerofu.com/index.php?main_page=product_info&cPath=11&products_id=30 Tiny] <br />
and<br />
[http://www.aerofu.com/index.php?main_page=product_info&cPath=11&products_id=31 TWOG]<br />
autopilots.<br />
</li><br />
<li><br />
Complete Kits ([http://www.aerofu.com/index.php?main_page=product_info&cPath=11&products_id=48 Tiny] or [http://www.aerofu.com/index.php?main_page=product_info&cPath=11&products_id=49 TWOG] based).<br />
</li><br />
<li><br />
[http://www.aerofu.com/index.php?main_page=product_info&cPath=10&products_id=20 PPM Encoders] and [http://www.aerofu.com/index.php?main_page=product_info&cPath=8&products_id=44 IR Sensors] from the Paparazzi project.<br />
</li><br />
<li><br />
Inexpensive [http://www.aerofu.com/index.php?main_page=product_info&cPath=7&products_id=12 uBlox LEA-5H GPS units].<br />
</li><br />
<li>various PCBs</li><br />
</ul><br />
<br />
= [http://chebuzz.com/paparazzi [[Image:CheBuzzPprz.gif]] CheBuzz Paparazzi] =<br />
Due to an unexpected change in my "real" job, I will regrettably be returning to the United States in the near future. As such, I will be closing my webshop for good. It has been a pleasure getting to know so many paparazzi users and an honor to supply hardware to you. Thanks for all the help and support I have received.<br />
<br />
I apologize for the short notice. But I will be taking orders until Friday 24 September, so anybody wishing to purchase paparazzi equipment from my store will be able to do so until that time.<br />
<br />
Thankfully somebody has offered to step up and take my place. I have been working with Chris and AeroFu (aerofu.com) and he has agreed to continue providing paparazzi hardware and to selling out the remainder of my inventory. I am confident he will continue to provide a high level of service and support for those looking to get into the hobby and into the paparazzi project.<br />
<br />
Again, thanks to all and happy flying!<br />
<br />
Buzz <br />
<br />
<br />
<br style="clear:both"><br />
<br />
= [http://www.jobyrobotics.com/ [[Image:JobyRobotics.jpg]]] JobyRobotics.com [[Image:Lisa_L_top.jpg|thumb|400px|Lisa/L STM32/Overo autopilot]][[Image:Lisa_L_bot.jpg|thumb|400px|Lisa/L STM32/Overo autopilot]] =<br />
Joby Robotics is a young company which aims at delivering cutting edge and affordable solutions for hobby, research and industrial robotics.<br />
<br />
Joby Robotics products are geared toward open standards and are, in particular, compatible with the Paparazzi free autopilot code base<br />
<br />
<br style="clear:both"><br />
<br style="clear:both"><br />
<br />
<br />
= [http://www.olimex.com/pcb/ Olimex] =<br />
[[image:pcb-green.jpg|thumb|400px|Olimex PCBs]]<br />
Fast PCB Prototypes<br />
[http://www.olimex.com/pcb/ www.olimex.com/pcb]<br />
<br />
<br style="clear:both"><br />
<br style="clear:both"><br />
<br />
= [http://www.ppzuav.com/ [[Image:Ppzuav.jpg]]] PPZUAV.com [[Image:All ppz autopilots med.jpg|thumb|400px|Paparazzi controllers]] =<br />
<h2>Providing professionally assembled and tested hardware for your Paparazzi Projects since 2007</h2><br />
<p><br />
Confused what to buy? Just give us an email and we will help you decide ('''sales@ppzuav.com''').<br />
</p><br />
<p>We make it simple. Each autopilot is <b>professionally assembled</b> in a large factory by automated pick and place and reflow to ISO9000 standards. <br />
To be sure yours will work we open every one and test before shipping. If it fails we don't sell it.</p><br />
<p>Our testing includes:<br />
<ol><br />
<li>Burn in testing: We Power it with a current limited power supply to verify voltages and current draw</li><br />
<li>Load the usb bootloader so it can be programmed via USB</li><br />
</ol><br />
</p><br />
<p><br />
Please eMail with any questions or special requests before you place your orders. We return emails as quickly as possible. If it's an easy question within hours. More complex or longer explanation requests may take some time to read then write your answer so be patient.<br />
</p><br />
<p><br />
Visit the PPZUAZ [https://store.ppzuav.com WebStore] to see the latest offerings.</b><br />
</p><br />
<p><br />
<h3>NEW ITEM: [https://store.ppzuav.com/osc/product_info.php?products_id=137 YAPA2] Some Assembly required but amazing low price: 50.00 USD</h3><br />
</p><br />
<br style="clear:both"><br />
<br style="clear:both"><br />
<br />
= [http://www.sparkfun.com Sparkfun] =<br />
[[image:P1030095.jpg|thumb|400px|Sparkfun]]<br />
Sparkfun is a great source of miscellaneous electronics like:<br />
* Gyros<br />
* Accelerometers<br />
* Pressure sensors<br />
* Ultrasonic distance sensors<br />
* Temperature/humidity sensors<br />
* USB to Serial converters<br />
* LEDs<br />
* Etc.<br />
<br />
<br style="clear:both"><br />
<br style="clear:both"><br />
<br />
<br style="clear:both"><br />
<br />
= Other =<br />
<br />
==u-Blox GPS receivers==<br />
<br />
There seems to be a few alternative source of u-Blox GPS out there. They are considerably cheaper then the samples u-Blox offers<br />
<br />
If you do order from any of them, please update this page with your feedback.<br />
<br />
Here's a few link worth exploring:<br />
<br />
*http://www.rfdesign.co.za/pages/5645456/Products/GPS-Products/Antaris-4-Modules.asp (Also [http://www.rfdesign.co.za/pages/5645456/Products/GPS-Products/u-blox-5-Modules.asp u-blox 5] and [http://www.rfdesign.co.za/pages/5645456/Products/GPS-Products/u-blox-6-Modules.asp u-blox 6] modules avialable)<br />
*http://www.comet.srl.ro/shop/info.html?ID=6195 ( Link error, you can find them in this list: http://www.comet.srl.ro/shop/statements.html?Type=MOD&Subtype=GPS )<br />
*http://www.expedienttech.com/product.htm ( Singapore )<br />
<br />
[[Category:Hardware]] [[Category:User_Documentation]]</div>DonEduardohttp://wiki.paparazziuav.org/w/index.php?title=Get_Hardware&diff=10693Get Hardware2011-11-23T15:49:08Z<p>DonEduardo: /* u-Blox GPS receivers */</p>
<hr />
<div>As an open-source project, all source code and hardware plans are [http://svn.savannah.gnu.org/viewvc/paparazzi3/trunk/hw/?root=paparazzi freely available on the SVN Server] for anyone to produce, use, modify, and redistribute in accordance with the [http://www.gnu.org/licenses/gpl.txt GPL License Agreement] which requires only that the open-source nature of the project be maintained by all who redistribute it.<br />
<br />
We encourage the distribution of hardware for profit or otherwise and invite any users with paparazzi-related hardware to post links and purchasing information on this page. Please use the [[Talk:Get_Hardware&action=edit|Discussion Tab]] to describe your experiences with any of these vendors.<br />
<br />
<hr><br />
<br />
<br style="clear:both"><br />
<br style="clear:both"><br />
<br />
= [http://aerofu.com [[image:aerofu_logo.png]] Aerofu.com ] =<br />
<br />
Low cost Paparazzi hardware from Australia. <br />
Licenced to export to [http://aerofu.com/index.php?main_page=page&id=2 33 countries], including Europe and North America. Recentry restocked with:<br />
<ul><br />
<li><br />
[http://www.aerofu.com/index.php?main_page=product_info&cPath=11&products_id=30 Tiny] <br />
and<br />
[http://www.aerofu.com/index.php?main_page=product_info&cPath=11&products_id=31 TWOG]<br />
autopilots.<br />
</li><br />
<li><br />
Complete Kits ([http://www.aerofu.com/index.php?main_page=product_info&cPath=11&products_id=48 Tiny] or [http://www.aerofu.com/index.php?main_page=product_info&cPath=11&products_id=49 TWOG] based).<br />
</li><br />
<li><br />
[http://www.aerofu.com/index.php?main_page=product_info&cPath=10&products_id=20 PPM Encoders] and [http://www.aerofu.com/index.php?main_page=product_info&cPath=8&products_id=44 IR Sensors] from the Paparazzi project.<br />
</li><br />
<li><br />
Inexpensive [http://www.aerofu.com/index.php?main_page=product_info&cPath=7&products_id=12 uBlox LEA-5H GPS units].<br />
</li><br />
<li>various PCBs</li><br />
</ul><br />
<br />
= [http://chebuzz.com/paparazzi [[Image:CheBuzzPprz.gif]] CheBuzz Paparazzi] =<br />
Due to an unexpected change in my "real" job, I will regrettably be returning to the United States in the near future. As such, I will be closing my webshop for good. It has been a pleasure getting to know so many paparazzi users and an honor to supply hardware to you. Thanks for all the help and support I have received.<br />
<br />
I apologize for the short notice. But I will be taking orders until Friday 24 September, so anybody wishing to purchase paparazzi equipment from my store will be able to do so until that time.<br />
<br />
Thankfully somebody has offered to step up and take my place. I have been working with Chris and AeroFu (aerofu.com) and he has agreed to continue providing paparazzi hardware and to selling out the remainder of my inventory. I am confident he will continue to provide a high level of service and support for those looking to get into the hobby and into the paparazzi project.<br />
<br />
Again, thanks to all and happy flying!<br />
<br />
Buzz <br />
<br />
<br />
<br style="clear:both"><br />
<br />
= [http://www.jobyrobotics.com/ [[Image:JobyRobotics.jpg]]] JobyRobotics.com [[Image:Lisa_L_top.jpg|thumb|400px|Lisa/L STM32/Overo autopilot]][[Image:Lisa_L_bot.jpg|thumb|400px|Lisa/L STM32/Overo autopilot]] =<br />
Joby Robotics is a young company which aims at delivering cutting edge and affordable solutions for hobby, research and industrial robotics.<br />
<br />
Joby Robotics products are geared toward open standards and are, in particular, compatible with the Paparazzi free autopilot code base<br />
<br />
<br style="clear:both"><br />
<br style="clear:both"><br />
<br />
<br />
= [http://www.olimex.com/pcb/ Olimex] =<br />
[[image:pcb-green.jpg|thumb|400px|Olimex PCBs]]<br />
Fast PCB Prototypes<br />
[http://www.olimex.com/pcb/ www.olimex.com/pcb]<br />
<br />
<br style="clear:both"><br />
<br style="clear:both"><br />
<br />
= [http://www.ppzuav.com/ [[Image:Ppzuav.jpg]]] PPZUAV.com [[Image:All ppz autopilots med.jpg|thumb|400px|Paparazzi controllers]] =<br />
<h2>Providing professionally assembled and tested hardware for your Paparazzi Projects since 2007</h2><br />
<p><br />
Confused what to buy? Just give us an email and we will help you decide ('''sales@ppzuav.com''').<br />
</p><br />
<p>We make it simple. Each autopilot is <b>professionally assembled</b> in a large factory by automated pick and place and reflow to ISO9000 standards. <br />
To be sure yours will work we open every one and test before shipping. If it fails we don't sell it.</p><br />
<p>Our testing includes:<br />
<ol><br />
<li>Burn in testing: We Power it with a current limited power supply to verify voltages and current draw</li><br />
<li>Load the usb bootloader so it can be programmed via USB</li><br />
</ol><br />
</p><br />
<p><br />
Please eMail with any questions or special requests before you place your orders. We return emails as quickly as possible. If it's an easy question within hours. More complex or longer explanation requests may take some time to read then write your answer so be patient.<br />
</p><br />
<p><br />
Visit the PPZUAZ [https://store.ppzuav.com WebStore] to see the latest offerings.</b><br />
</p><br />
<p><br />
<h3>NEW ITEM: [https://store.ppzuav.com/osc/product_info.php?products_id=137 YAPA2] Some Assembly required but amazing low price: 50.00 USD</h3><br />
</p><br />
<br style="clear:both"><br />
<br style="clear:both"><br />
<br />
= [http://www.sparkfun.com Sparkfun] =<br />
[[image:P1030095.jpg|thumb|400px|Sparkfun]]<br />
Sparkfun is a great source of miscellaneous electronics like:<br />
* Gyros<br />
* Accelerometers<br />
* Pressure sensors<br />
* Ultrasonic distance sensors<br />
* Temperature/humidity sensors<br />
* USB to Serial converters<br />
* LEDs<br />
* Etc.<br />
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= Other =<br />
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==u-Blox GPS receivers==<br />
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There seems to be a few alternative source of u-Blox GPS out there. They are considerably cheaper then the samples u-Blox offers<br />
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If you do order from any of them, please update this page with your feedback.<br />
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Here's a few link worth exploring:<br />
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*http://www.rfdesign.co.za/pages/5645456/Products/GPS-Products/Antaris-4-Modules.asp (Also -5 and -6 modules avialable)<br />
*http://www.comet.srl.ro/shop/info.html?ID=6195 ( Link error, you can find them in this list: http://www.comet.srl.ro/shop/statements.html?Type=MOD&Subtype=GPS )<br />
*http://www.expedienttech.com/product.htm ( Singapore )<br />
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[[Category:Hardware]] [[Category:User_Documentation]]</div>DonEduardo