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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 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. "
17 hours ago
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?"
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
Jack Crossfire commented on Gary McCray's blog post GoPro 4 is Here - Sort of!
"What a piece of crap.  The Hero 5++ is so much better, for only $999. "
Sep 30
Todd Hill commented on Jack Crossfire's blog post Analysis of the follow cam problem
"Wouldn't a plenoptic camera be better suited for this?"
Sep 27
Jack Crossfire commented on Brian Martin's blog post Thermal Imaging Camera Competition (FLIR ONE vs SEEK Thermal)
"Pity the fools who wasted their lives hacking point & shoots for IR.  Even these are trash compared to the 60fps HD ones coming from China next week. "
Sep 26
Jack Crossfire commented on Gary Mortimer's blog post Congratulations Canberra UAV, stunning Outback Challenge win
"Amazing that it separated the 1 white blob from the other white blobs.   For autonomously calculating a ballistic trajectory by entering an autonomous pattern & autonomously measuring the environment, it's better than any military…"
Sep 26
Jack Crossfire commented on Gary Mortimer's blog post Congratulations Canberra UAV, stunning Outback Challenge win
"There was either some ballistics calculation going on, factoring in airspeed & wind, or low altitude using LIDAR.  He keeps his job for another year."
Sep 26
Jack Crossfire commented on Gary Mortimer's blog post Hollywood given the green light
"Since no movie ever reports net income to the IRS, no money is made & it's legal!  What a victory for diydrones commenters. "
Sep 25
Jack Crossfire commented on Felix Meissner's blog post Testing a small thermal imaging camera
"Incredible for a civilian to have access to that framerate.  Obviously not for sale, because that would be illegal.  The 9fps limit is still a restriction they're serious about enforcing. "
Sep 25
Jack Crossfire commented on Rob_Lefebvre's blog post Small Electric Helicopter 108km/h Auto Flight
"67mph for you yanks.  You'd  think the drone delivery startups would have used single rotor copters for longer range, but it's all about the current big thing.  Can't remember what the latest flight dynamics…"
Sep 22
Jack Crossfire commented on Nicolas's blog post 3DR IRIS gets approved in France by DGAC (french FAA).
"But is the DGAC a partner of 3DR?"
Sep 19
Jack Crossfire commented on Chris Anderson's blog post Pocketcopter project on Indiegogo
"Did anyone even read the description when they bought it?  7.5x1.75" is a brick. That $1/2 million hex never shipped a thing."
Sep 15

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
Pleasanton, Calif*

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Jack Crossfire's Blog

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,…


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…


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.…


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…

Lipo teardown

Posted on April 18, 2014 at 1:51pm 9 Comments

Tore down a completely puffed, dead, 0V cell.  It was still air tight.…

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:

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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