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Jack Crossfire's Groups

Jack Crossfire's Discussions

EasyStar as a pure GPS UAV

Started this discussion. Last reply by Reto Oct 29, 2009. 7 Replies

 

Jack Crossfire's Page

Latest Activity

Jack Crossfire commented on Rob Dunbar's blog post 1st Drone in Nevada Test Program Crashes in Demo
"The drone crash looked just like an RC plane being hand launched."
Sunday
Chim Xotox commented on Jack Crossfire's blog post An entire neighborhood XMas lightshow from a quad
"Nice, can you tell us what airframe, gimble and camera? Also a tip; As you see, speedy horizontal panning yields an unpleasant vertiginous jerkyness. It seems to matter not what camera is used, video panning only seems to work decently if done…"
Dec 10
Pedals2Paddles commented on Jack Crossfire's blog post An entire neighborhood XMas lightshow from a quad
"Now this is a neighborhood after my heart!"
Dec 10
Fnoop Dogg commented on Jack Crossfire's blog post An entire neighborhood XMas lightshow from a quad
"amazing, at the same time wtf surely better ways for the world to spend it's time and resources!"
Dec 10
Dave Wicks commented on Jack Crossfire's blog post An entire neighborhood XMas lightshow from a quad
"Very cool! I want to move into that neighbourhood!"
Dec 10
Hugues commented on Jack Crossfire's blog post An entire neighborhood XMas lightshow from a quad
"Nice sync with music! How are these housing lights synced to it?"
Dec 9
Jack Crossfire posted a blog post

An entire neighborhood XMas lightshow from a quad

Holy subprime seasons.  While it was always possible for an entire neighborhood to synchronize its lights, it wasn't possible to actually see it until last year.  It's really a sight that cost a fortune until the rise of the quad, higher sensitivity cameras, & then the brushless gimbal.  Of course, flying a quad that high above a neighborhood is a very nerve wracking experience for someone who's done it long enough to experience a few crashes. It almost makes our taxes to support the house…See More
Dec 9
Jack Crossfire commented on Chris Anderson's blog post NASA's Ikhana captured the stunning video of Orion's splashdown
"That was what we thought quad copters would be doing, 10 years ago."
Dec 7
Jack Crossfire commented on Jeevan Kalanithi's blog post New job openings at 3D Robotics! Experienced EE's, ME's, embedded SW, flight test engineers and mobile developers - come on down
"It's unfortunate that most of us on DIYdrones know Chris, but none of the people doing the hiring, so the odds favor someone from outside."
Dec 3
Jack Crossfire posted a photo
Nov 27
Jack Crossfire commented on Andrew Tridgell's blog post APM:Plane 3.2.0 released
"Funny how Arduplane started on Arduino libraries, then moved to its own libraries, then moved to Nuttx libraries, then moved to not benefitting at all from Nuttx either. "
Nov 24
Jack Crossfire commented on Roger Sollenberger's blog post 3DR Announces the Release of New FPV Kit
"Don't you need a new quad copter with motorized folding arms & a white fuselage shaped like a traditional copter?"
Nov 19
Jack Crossfire commented on Bob's blog post Sunk DJI Phantom Found In The Ocean After One Year
"The reality of flying not shown in the product promotion videos."
Nov 16
Jack Crossfire commented on Gary Mortimer's blog post New Phantom?
"Have they hit 1000 ways to rearrange a quad copter by now?"
Nov 7
Jack Crossfire commented on AKRCGUY's blog post 3DR IRIS+ Follow Me and Auto Mission Demo
"Would have been neat if the entire flight from start to finish was controlled by watch.  It's technically much easier than Google Glass (does anyone remember that heap of trash?), but expensive. "
Oct 28
Jack Crossfire commented on Jonathan Meringer's blog post Scout Drone - Video Update
"You could probably hack a Blade MCX to use folding blades to get a smaller form factor."
Oct 28
Jack Crossfire commented on AKRCGUY's blog post 3D Robotics IRIS+ Mapping & Follow-Me Demo
"That was about the best produced video so far.  Mapping unpopulated fields is definitely in the bag."
Oct 11
Jack Crossfire commented on Iain Butler's blog post eXom – the drone that lets you focus on your work, not on flying
"You have to be real quick to spot a previously unknown feature on the monitor & start the auto targeting with all 5 cameras before the 10 minute flight time is up, otherwise you might as well land & change cameras."
Oct 7
Jack Crossfire commented on Andrew Tridgell's blog post CanberraUAV Outback Challenge 2014 Debrief
"Who knew the 3DR Radio had evolved into the RFD900 or there was a 5.8Ghz ethernet bridge.  Feeds & speeds continue to evolve in a parallel universe, while the news focuses on wearable dingbats & 3D printers."
Oct 4
Jack Crossfire commented on Chris Anderson's blog post Google Science Fair winner models drone obstacle evasion on fruit flies
"14 is ancient, by modern standards.  Never hire anyone over 10.  Interesting to note the quadratic least squares regression he used to detect false positives, even though he never said if it worked."
Oct 3

Profile Information

About Me:
Head of blog rambling.

The 1st 3 years of flying + more off topic posts are on http://www.rcgroups.com/forums/member.php?u=115141

Image processing, robotics, & aeronautics are on http://heroinewarrior.com

Most diy droners are RC modelers who just want to automate their favorite model plane. I came from an image processing, software, & robotics background, not an RC modeling background, so my focus is on flight control, image acquisition, & blogs that no-one reads.
Please tell us a bit about your UAV interest
x
Hometown:
Pleasanton, Calif*

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Jack Crossfire's Blog

An entire neighborhood XMas lightshow from a quad

Posted on December 9, 2014 at 8:39pm 5 Comments

Holy subprime seasons.  While it was always possible for an entire neighborhood to synchronize its lights, it wasn't possible to actually see it until last year.  It's really a sight that cost a fortune until the rise of the quad, higher sensitivity cameras, & then the brushless gimbal.  Of course, flying a quad that high above a neighborhood is a very nerve…

Continue

Analysis of the follow cam problem

Posted on August 4, 2014 at 1:00pm 12 Comments

MikroKopter - FollowMe on the Wakeboard from Holger Buss on Vimeo.

The follow me concept using GPS is nothing new. It was demonstrated in 2008 at long range, with the normal lens cameras of the time.



Now, they're doing it at slightly closer ranges,…

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The big 3 without editing

Posted on July 22, 2014 at 6:38pm 8 Comments



With so many unemployed programmers, it was only a matter of time before someone would try to free the bits & upload some videos. We'll see how long this lasts until the indy movie studios crush the rebellion. These videos covered what currently are the 3 mane copters, in a rare appearance without any editing.



Collinn was a lot more down to Earth than…

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Brushless direct drive rover

Posted on July 11, 2014 at 11:25pm 7 Comments







The journey began when the G-buggy which served for 6 months was stepped on, bending a shaft & putting it out of duty.  It was otherwise falling apart on its own, after pacing 110 miles of running.…





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Adventures with an RC car exercise coach

Posted on April 26, 2014 at 9:28pm 1 Comment



The RC car came along on Jan 8, 2014.  The…
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Comment Wall (10 comments)

At 6:54am on March 30, 2008, Howard Gordon said…
Interesting reading. I spent some time with your blog at rcgroups, noting in particular your application of artificial neural nets. I may have missed a jump in your progression, but are you still running the lwneuralnet on a gumstix ? Just wondering, as most neural net libraries use floating point, but the gumstix only has fpu emulation, which is not fast.

Reason I ask is that I converted a simple back prop library to integer math and built it into my firmware, but have just started to think about how to incorporate it into actual operation. As you already have real-world experience in integrating back prop functions, I wondered if you wanted to give the code a try (on the ground) to see if the integer approximations are sufficiently accurate. I map 0.0 : 1.0 into 0 : 1024. If interested, code is here. Let me know if you have a chance to experiment - I'd appreciate some feedback.
At 12:26pm on March 30, 2008, Jack Crossfire said…
Converted lwneuralnet to integer a long time ago. It worked for solving the neural network but not for back propagation. Back propagation required more precision & full range beyond 0-1. 2048 lookup table entries was the largest before the cache overflowed.
At 6:58am on November 28, 2008, Constantinescu said…
Please help me to find all details concerning the software and hardware of version 2 implementation on a T-REX450 with a laptop. I intend to reproduce that on my ECO8.Many thanks,Georges
At 12:26am on November 29, 2008, Constantinescu said…
Thanks for your answer. I alreadi recovered the archive. Could you please send me some more detals concerning the hardware(components, electric connections, procedures for preliminar adjustement of parameters, etc); something "pense bete" for a beginer in the field. Yours Georges
At 10:57pm on April 8, 2009, Harry Cheung said…
Yeah, I should have included that. Anyways, I added a link to the ublox module I have, it's this:

http://www.sparkfun.com/commerce/product_info.php?products_id=8889
At 9:32pm on May 25, 2009, Zik said…
Hi Jack - thanks for your comments on picoc. Yes, it's still alpha quality at this stage. I'm still working on it pretty heavily but hope to reach a 1.0 release in the not too distant future.
At 9:38pm on October 17, 2009, Andy Geppert said…
Jack, any chance you're in flying in the bay area Sunday (the 17th)? I'm in the area this weekend and it would be cool to meet you and see your machine fly.
At 3:10pm on December 4, 2009, Sahil Jain said…
so Chris is from Sparkfun? and you're from...?

sorry, for asking these questions. I am trying to design a board that I want to sell in the $80-100 price range. so trying to understand the target costs. any help would be appreciated. Just for fun, not going to make any money on it. Thanks.
At 3:33pm on December 8, 2009, Jack Crossfire said…
Most of the people on diydrones sell products through Sparkfun. The standard arrangement is to add 40% to the price & Sparkfun adds another 40% to the price. It's no secret. A place like Cloudcap adds 1000% to the parts. Personally working in Indian outsourcing where they expect a 12 hour / 6 day commitment & if you're spending evenings selling your own product instead of your boss's, it better produce a 1000% return or you're out. All your time is company time in outsourcing.
At 3:55pm on December 6, 2010, Hamish said…
$5 per gyro axis? what ? where? gimme gimme gimme!

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