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Boulder, CO


Activity Feed

Spencer Riggs commented on Chris Anderson's blog post Draft project assignments--please review
"Sounds good, I can't wait to get started!"
Oct 1, 2009
Spencer Riggs commented on Sarel P. Wagner's blog post Open Source Airframe
"No problem. Send it to spencer.riggs@gmail.com and I will take a look."
Oct 1, 2009
Spencer Riggs commented on Sarel P. Wagner's blog post Open Source Airframe
"I need to check if I have XFLR5 on my laptop, but I probably would not get to it until this weekend at the earliest."
Sep 30, 2009
Spencer Riggs commented on Sarel P. Wagner's blog post Open Source Airframe
"The numbers look correct to me at a first glance. I would have to do the analysis myself to verify, but everything looks reasonable."
Sep 30, 2009
Spencer Riggs commented on Chris Anderson's blog post Help wanted!
"Sorry, hit enter too fast. I can also work on number 6, and help with maintenence/management of number 3."
Sep 29, 2009
Spencer Riggs commented on Chris Anderson's blog post Help wanted!
"I'd love to contribute to numbers 5 and 9, I can document pretty well."
Sep 29, 2009
Spencer Riggs commented on Chris Anderson's blog post UAVs launching UAVs
"I am a graduate aerospace student at CU, and I feel the need to add some clarification. As a public research institution, we are subject to different rules than the hobbyist community. So there is a lot of restrictions on what the team can actually…"
Apr 6, 2009
Spencer Riggs commented on William Premerlani's blog post UAV DevBoard users: Wait for MatrixNav firmware
"Bill,

I think I read your post incorrectly, I need to remember to not use the internet when I wake up! You are right that the DCM is used for control, but it might be interesting to use quaternions in the control loop. Always impressed with your…"
Mar 30, 2009
Spencer Riggs commented on William Premerlani's blog post UAV DevBoard users: Wait for MatrixNav firmware
"Actually you don't need the DCM for the body transformation, you can use the elements of the quaternion vector for the entire transformation matrix. And since its all linear operations, it is faster. The singularity in the DCM comes when the pitch…"
Mar 30, 2009
Spencer Riggs commented on William Premerlani's blog post UAV DevBoard users: Wait for MatrixNav firmware
"Forgot to add that quaternions have no singularity present in the DCM approach and are more generalized, which can be useful."
Mar 29, 2009
Spencer Riggs commented on William Premerlani's blog post UAV DevBoard users: Wait for MatrixNav firmware
"Bill,

I have followed the progress of your hardware for a couple of years now, I have a suggestion for you though. Instead of the DCM approach, you may want to consider quaternions. They are much faster computationally, although not as intuitive.…"
Mar 29, 2009
Spencer Riggs commented on John Bartley K7AAY's blog post Why I'm Here - To Save Firefighter Lives With A Drone Radio Repeater
"The University of Colorado at Boulder is already doing this, and have been doing optimized radio node research for nearly a decade now. I suggest checking recuv.colorado.edu or augnet.colorado.edu to review the work done. We are doing things with…"
Feb 7, 2009
Spencer Riggs commented on SLUGS Team's blog post SLUGS Autopilot. Soon to become Open Source.
"When are you thinking it might be released?"
Jan 24, 2009
Spencer Riggs commented on Jordi Muñoz's blog post First Arduino IMU test
"Hey,

Is the source code available somewhere? I am interested in building on this code to go to 6 DOF, but I wanted to see how this code works.

Thanks!"
Jan 21, 2009
Spencer Riggs commented on Chris Anderson's blog post Using the 5Hz Locosys GPS with Arduino/ArduPilot
"Yes, I saw the battery backup, but I was a bit unclear on how it worked.

I think I am going to try to use Sparkfun's RS232 shifter, or breadboard it. RS232 would be a bit more convenient for me than FTDI, but I have enough budget to try both.…"
Dec 14, 2008
Spencer Riggs commented on Chris Anderson's blog post Using the 5Hz Locosys GPS with Arduino/ArduPilot
"How did you connect the module to your computer to configure it? Also, does it store configuration in ROM or does it have a battery backup?"
Dec 14, 2008
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