Jack Crossfire
  • San Ramon, CA
  • United States

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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 Jack Crossfire's blog post MakerBot Acquired In $604 Million Deal
"2 years after Bre got his $600 million reward, the staff finally got theirs: pink slips. http://motherboard.vice.com/read/makerbot-just-laid-off-20-percent-of-its-staff"
Apr 17
Jack Crossfire commented on Chris Anderson's blog post A glimpse of the scene at the 3DR booth at NAB
"That's like a $200,000 booth, next to Panasonic.  Multi billion dollar valuations have come."
Apr 14
Jack Crossfire commented on Chris Anderson's blog post Full Solo launch video
" While there are no demo videos, there is an animated GIF on Gizmodo showing some pretty impressive waypoint flying, mere feet from human heads, using just GPS.  Of course, it isn't a hit until there's a Kickstarter campaign. "
Apr 14
Jack Crossfire commented on Jesper Andersen's blog post And they say smoking is bad
"Li-Mn is an intriguing combination lacking the current of Li-Po, lacking the instability of Li-ion, with capacity in between.  The advantage is slightly higher power density without requiring a protection circuit."
Apr 10
Jack Crossfire commented on Mark Harrison's blog post Lending Club Testing Loan Drones for Faster Cash Disbursement
"Janet Yellen's next step, if the stock market ever falls below 17,000."
Apr 1
Jack Crossfire commented on Chris Anderson's blog post 3DR announces DroneKit, a full-featured SDK for drones, mobile and cloud
"Time to change the name to 3D Salesforce."
Mar 27
Jack Crossfire commented on Chris Anderson's blog post Google scraps VTOL design, back to the drawing board
"Does all of Google apply analytics to what percentage of an engineering team thinks something is a bad idea & treat the 5 month rule as a wall which must not be crossed?  How do these guys ever make a coffee?"
Mar 18
Jack Crossfire commented on Chris Anderson's blog post "Tyrone Drone", for unmanned aerial graffiti (with spray paint and flame thrower)
"Good compliment to the quad copter shaving cream dispenser."
Mar 14
Jack Crossfire commented on Chris Anderson's blog post Percepto, an add-on computer vision module for drones, now on Indigogo
"Used to make jokes in 1999 about selling a bag of silicon around which a community of open source developers would form to build millions of dollars of software around it."
Mar 13
Jack Crossfire commented on Grant Morphett's blog post Rover Release 2.49 is OUT!
"Can't wait for path following.  Maybe after the Google buyout."
Mar 6
Jack Crossfire commented on PacificBots's blog post Pacificbots - Update
"Would be interesting if a hobby grade ROV got images of the trans bay tube. Still well beyond today's technology, but not too unrealistic for a kickstarter project."
Feb 28
Jack Crossfire commented on Thomas J Coyle III's blog post Drone Maker 3D Robotics Raises $50 Million In Latest Round
"Buy out a good one."
Feb 27
Jack Crossfire commented on Chris Anderson's blog post No drones at this year's Sparkfun AVC :-(
"Quads are a victim of their own success.  Fortunately, you invested in ground robots."
Feb 18
Jack Crossfire commented on Chris Anderson's blog post Analysis of leaked FAA rulemaking preview
"No idea what this blog post said, but it must be wonderful to be married to a lawyer without health problems."
Feb 14
Jack Crossfire commented on Chris Anderson's blog post The star of "The Aviator" are these huge model airplanes built by a drone company
"Too bad they were 10 years too early to get a $15 billion buyout offer from Google."
Feb 14
Jack Crossfire commented on Steve Stark's blog post Global UAV Market (2014-2020)
"The global Unmanned Aerial Vehicle (UAV) market in 2014 was not much different than China's flying toy sales in 2014. "
Jan 29
Jack Crossfire commented on Chris Anderson's blog post Latest pictures from the 3D Robotics Tijuana factory
"Can hear Larry Page upping his offer by a few quadrillion."
Jan 26
Jack Crossfire commented on William Davidson's blog post Market Survey/ What is needed?
"2 hours flight time.  Ability to fly 5ft in front of you & track your movement.  Small enough to fit in a backpack."
Dec 29, 2014
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."
Dec 20, 2014
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, 2014

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

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…


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…

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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