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 AKRCGUY's blog post Is our Hobby Doomed?
"Finally, something diydrones can comment on.  Unfortunately, bending the rules is the only way the quad copter industry is going to manetain its 12 figure valuations."
Saeed Molaie commented on Jack Crossfire's blog post Secrets of the MPU9150
"Can someone please explain why we need two slaves (0 and 1)  when initializing the magnetometer? "
May 6
Olivier commented on Jack Crossfire's blog post Evolution of the RC car exercise coach
"@ Jack: Well done! For increased autonomy you could  try supervised deep learning, you may be happily surprised ... End to End Learning for Self-Driving Cars. And there is this now. For trails on a budget, hmm, there's always the…"
May 1
Thomas Stanley-Jones commented on Jack Crossfire's blog post Evolution of the RC car exercise coach
"@chris, I'm thinking yours would be better in front with a tow rope.  Running a marathon would be so much easier!"
May 1
Gary McCray commented on Jack Crossfire's blog post Evolution of the RC car exercise coach
"And I was so happy about the size of my new XMAXX ): I forgot you had the Tim Allen version. If you set that up as a pace setter it would offer real incentive, especially if you put it behind the runner. I think I'll hook up my Kubota…"
May 1

3D Robotics
Chris Anderson commented on Jack Crossfire's blog post Evolution of the RC car exercise coach
"@ Gary: Rover might not be the word ;-) Carl Bass and I are competing in this. "
May 1
Gary McCray commented on Jack Crossfire's blog post Evolution of the RC car exercise coach
"@ Chris, How about some info on your rover, just getting ready to go down that road with my new XMAXX and Hokuyo Scanner and an Erle2 Brain myself. Best regards, Gary"
May 1
Gary McCray commented on Jack Crossfire's blog post Evolution of the RC car exercise coach
"Fantastic Jack, Haven't heard much from you in the last few years, now this. As usual, making a silk purse out of a sows ear and way ahead of the rest of us. You really are my Hero and no GoPro jokes allowed. I'm sure the ex Boston…"
May 1

3D Robotics
Chris Anderson commented on Jack Crossfire's blog post Evolution of the RC car exercise coach
"Love this! Did you ever post your machine vision code? I'd love to try the same thing on my Erle2 Brain-powered rover, which has similar processing power to the Odroid. "
Apr 30
Jack Crossfire posted a blog post

Evolution of the RC car exercise coach

It's been a long journey from the G-Buggyto the failed balancer…See More
Apr 30
Jack Crossfire commented on Chris Anderson's blog post Augmented reality, custom geofencing, smart "rewind" and more in new 3DR Solo software
"Is this going to raise east bay rent again?"
Apr 18
Jack Crossfire commented on Chris Anderson's blog post Anyone remember UNAV?
"It was more interesting when you could match a $15,000 product by doing it yourself, even if the total investment in crash damage made the prices similar.  It was a short window when electronics got ahead of industry."
Apr 11
Jack Crossfire commented on Chris Anderson's blog post Pixhawk-compatible scanning LIDAR on Kickstarter.
"It looks  strangely like another XV-11 at 245% the cost."
Mar 17
Jack Crossfire commented on Chris Anderson's blog post Los Angeles condo first to be build with drone landing pad on the roof
"To be sure, a drone landing pad is worth many billions more than just a landing pad."
Mar 3
Jack Crossfire commented on Chris Anderson's blog post Swarming demo with Solos from Accelerated Dynamics
"To get bought out by Google, you need to be named after a city.  Example: London Dynamics."
Feb 26
Jack Crossfire commented on Chris Anderson's blog post Save the date for Sparkfun's AVC 2016
"How many contests can Tridge enter before he explodes?"
Feb 23
Jack Crossfire commented on Chris Anderson's blog post New Oppenheimer report on the drone market. (Nobody knows how big it is)
"With negative interest rates coming, valuations should become unlimited even with no sales."
Feb 19
Jack Crossfire commented on Gary Mortimer's blog post Mass market RTK from uBlox
"The uBloxes always supported RTK, but required a $300 module with unlocked firmware to generate RTCM messages.  It's the same price, but repackaged from the source so you don't have to track down rtklib."
Feb 16
Jack Crossfire commented on Chris Anderson's blog post Autonomously navigating warehouses fast (with Pixhawk)
"The autopilot goes even faster with Curtis Youngblood at the controls."
Feb 14
Jack Crossfire commented on Gary Mortimer's blog post Its Tridge!!!
"A rare account of the difficulties of copters & quantification of the advantages of a quad plane. "
Feb 9

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

Evolution of the RC car exercise coach

Posted on April 30, 2016 at 6:58pm 7 Comments

It's been a long journey from the G-Buggy

to the failed balancer…


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.…


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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