Jack Crossfire
  • San Ramon, CA
  • United States

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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 Thomas J Coyle III's blog post GoPro is in a massive tailspin
"The Ricoh Theta S is now the big thing.  A 360 camera doesn't need brushless gimbals or pointing.  All the composition & stabilization can be done after shooting.  Gopro will never get it.  They're egotistical…"
4 hours ago
Jack Crossfire commented on Chris Anderson's blog post Trebuchet drone launcher
"That's 1 way of getting discovered.  What's really needed is a trebuchet that launches buyout offers."
Jan 24
Jack Crossfire commented on Chris Anderson's blog post Range testing the ESP8266 Wifi module
"$3 + $6 for that thing is quite a reduction from the small fortune of the old 3DRRRRadio, but it's unremarkable otherwise.  The old 20dB transmit power is focused down a narrower bandwidth of 1Megabit, leading to longer range.  If it…"
Jan 22
Jack Crossfire commented on Gary Mortimer's blog post Organic Vegan Quad Copter Drone
"Facebook just offered $5 billion."
Jan 22
Jack Crossfire commented on Thomas J Coyle III's blog post Bird-repelling drone imitates a real-life predator to clear property of unwelcome pests
"When scarecrows just aren't good enough.  There's 1 really grumpy old man who desperately wants this."
Jan 18
Jack Crossfire commented on Thomas J Coyle III's blog post ROBOTIC SUITCASE FOLLOWS YOU AROUND
"Obviously, no-one will ever figure out how the BLE localization works, but you can already see the problem if baldy starts running & how bad the accuracy is."
Jan 17
Jack Crossfire commented on Rosalie (@rosalieinc)'s blog post What will the Commercial Drone Industry look like in 2016?
"2016 will probably be the year for ground vehicles.  The "hoverboard" & electric skateboard craze are evidence people are getting more interested in a ground vehicle which can move cargo for 10's of miles in urban…"
Jan 4
Jack Crossfire commented on Chris Anderson's blog post Glimpse of what Qualcomm Snapdragon Flight board will enable next year
"When are you going to get Randy a camera with manual focus?"
Jan 2
Jack Crossfire commented on Greg Dronsky's blog post Amazon Shows Off New Prime Air Drone With Hybrid Design
"It seems like rather silly wandering of PhD's to further their own research instead of Bezos's goal.  The most direct solution was a network of autonomous base stations spaced 10 minutes apart.  A quad copter would fly for 10…"
Nov 29, 2015
Jack Crossfire commented on Thomas Stone's blog post Jetson TK1 Promo Offer
"The JTK1 is a traditional Silicon Valley product, with very large 1980's style connectors, very large board intended for a large company to use as a reference for designing their own layout with their own layout person.  The Odroid is a…"
Nov 11, 2015
Jack Crossfire commented on Jimmy Oliver's blog post Kickstarters' Zano in trouble
"RC flying has now gone from a hobby to a multi billion dollar business, & is finally becoming a poster for infomercial ripoffs.  Unless one of the weekly battery breakthroughs comes true or Facebook makes a $50 billion offer for the FAA…"
Nov 11, 2015
Jack Crossfire commented on Chris Anderson's blog post Pixhawk/APM compatible Wifi radio
"Never did get why the multi billion dollar quad copter startups never made a wifi-900Mhz bridge that stood near the phone, converting short range wifi into long range 900Mhz, without janky cables.  It was how hobbyists always did it."
Nov 4, 2015
Jack Crossfire commented on Rob_Lefebvre's blog post Novel UAV Airplane Launch and Recovery System
"But the octocopter doesn't have a flag."
Oct 31, 2015
Jack Crossfire commented on Chris Anderson's blog post Great report on Syria Airlift project, using APM-powered planes for humanitarian aid
"Finally, a Syrian airlift post without comments disabled."
Oct 5, 2015
Jack Crossfire commented on Michael Duffy's blog post Worlds Largest UAV Quadcopter was built in the 1960s
"Bet it was worth less than the typical $50 billion valuation of a modern quad copter."
Sep 19, 2015
Jack Crossfire commented on Thomas J Coyle III's blog post Droneport will enable drone deliveries of urgent supplies in Rwanda
"Is that an iPhone 6 over on the Elysia side?  How are they going to stop some guy on Earth who just got irradiated from his auto body painting job from hijacking a quad copter to steal the miracle cure only intended for Elysia? …"
Sep 18, 2015
Jack Crossfire commented on earthpatrol's blog post Multiple Flying Robots on a Daily Basis
"How much is your valuation?"
Sep 14, 2015
Jack Crossfire commented on Todd Urban's blog post Solo Crash at us open " More Bad Publicity Please Stop doing Stupid Thing Before They Ban Drones"
"It was the glare from the diamond studded, Jonnie Ives inspired stick controllers."
Sep 5, 2015
Jack Crossfire commented on Simon D. Levy's blog post ODROID + Flip32 Mini Quadcopter, Part II: Mounting and Flying the ODROID
"Too bad the XU4 can only operate 4 cores at a time & people just aren't willing to spend that much extra money for a minor improvement over the pi 2.0.  At least this was the farthest anyone ever got with an odroid. "
Sep 1, 2015
Amir commented on Jack Crossfire's blog post Laser range finder teardown
"Hi, Where can I download  the CF325's datasheet? "
Jul 24, 2015

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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