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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 Monroe Lee King Jr.'s blog post Using the Stars, Sun the Moon and the Horizon rather than GPS
"Phones were supposed to be able to navigate by the stars & photograph Saturn by now.  Then Steve Jobless died."
Jack Crossfire commented on AKRCGUY's blog post Nice Introduction To The 3D Robotics Staff
"So how is Google's buyout going to be split?"
Jack Crossfire commented on Oliver's blog post Drone flyby reveals ancient village buried in New Mexico
"That's a real FLIR Tau 2 640x512 30fps cam with wide angle lens, not a hacked point & shoot.  It costs mega bucks & isn't exported."
Jack Crossfire commented on Chris Anderson's blog post Google buys Titan Aerospace (solar powered, high-altitude drones)
"Just practicing buyouts before the big one."
Jack Crossfire commented on Chris Anderson's blog post Gumstix releases PX4-compatible Linux flight controller board
"Sort of sad to see another STM32 board come from these guys."

Wiki Ninja
Gary McCray commented on Jack Crossfire's blog post Robot show
"Thank You Jack, Love your perspective as always. We need to Kickstart the $300.00 3 axis FOG. Then we can sell it to Google for umpteen billion."
Apr 9
Jack Crossfire posted a blog post

Robot show

It was packed with unemployed, flat broke programmers.  As far as jobs, there was 1 engineering job at NASA which required many more years of college & had a line of guys wanting to get in.  There is far more talent than demand.  Stock & buyout prices don't reflect the real economy.…See More
Apr 9
Jack Crossfire commented on Andrew Tridgell's blog post APM:Plane 3.0.0 released
"Judging by the tuning parameters: 4.1 AHRS_EKF_USE, 4.2 EKF_VELNE_NOISE, 4.3 EKF_VELD_NOISE, 4.4 EKF_POSNE_NOISE, 4.5 EKF_ALT_NOISE, 4.6 EKF_MAG_NOISE, 4.7 EKF_EAS_NOISE, 4.8 EKF_WIND_PNOISE, 4.9 EKF_WIND_PSCALE, 4.10 EKF_GYRO_PNOISE, 4.11…"
Apr 7

Roberto Navoni commented on Jack Crossfire's blog post Syma X3 as a robotic platform
"I agree :) But if i have more voltage i prefer to find more efficient motors :) So i have more lift .. you don't know if exist replace of standard 3.7 voltage with 7.4 ?  bestRoberto"
Apr 7
Jack Crossfire commented on Jack Crossfire's blog post Syma X3 as a robotic platform
"Don't set the PWM higher than 50%."
Apr 6

Roberto Navoni commented on Jack Crossfire's blog post Syma X3 as a robotic platform
"Ho Jack , the dc motor accept only 1s battery or support also 2S battery ? On my test i see that if you use more 3.0 volt to motor after 2 minutes the motor fail ... i'm searching valid option that support until 7v .. someone have idea wher i…"
Apr 6
Jack Crossfire commented on Hai Tran's blog post Triathlete sustains head injuries from a drone
"DJI will surely be offering liability insurance, just like China's many other achievements in real estate, stem cell research & finding flight 370."
Apr 6
Jack Crossfire posted a blog post
Apr 6
Jack Crossfire commented on Roberto Navoni's blog post APM SITL , Lasernavigator 3D and VR PAD Station 2.0.1 last update , how learn advanced functionality of your drone in a safe enviroment
"Tell the guy in the back to shut up when you're making a video."
Apr 6
Jack Crossfire commented on Chris Anderson's blog post Great demo of drone mapping using Mapbox and Pix4D with a 3D Robotics Aero
"Honestly think it looks terrible, no matter how easy, great, styled & .js it is."
Apr 4
Jack Crossfire commented on Roger Sollenberger's blog post 3D Robotics engineering moves to their incredible new space this weekend
"Still not as big as Goog's indoor flying room. The big question is why bother going through the trouble of keeping some people north of the border at all, how much progress have Google, Facebook, 3D Robotics made on the Mighty Indoor Mapping…"
Apr 4
Jack Crossfire commented on Nicolas Vuignier's blog post Antimedia present's the "Owl Cam"
"His demo cleverly only shows skiing & skating.  Let's see someone try this bit of brushless gimbaling: "
Apr 4
Jack Crossfire commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"Tier 1 of the maker movement, where the guy only makes a proof of concept that never flies.  These guys usually become middle managers & make $50 billion on kickstarter donations."
Apr 2
Jack Crossfire commented on Chris Anderson's blog post Flocking drones fall into line by themselves
"Surprised that guy isn't working at Sparkfun, with that beard."
Apr 1
Jack Crossfire commented on Chris Anderson's blog post Just $1,000 to go (in one day) to get real lasers with LIDAR-Lite!
"Can you work with anyone else before production or does 3DR have exclusive rights?"
Mar 31

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

Robot show

Posted on April 9, 2014 at 8:29pm 1 Comment

It was packed with unemployed, flat broke programmers.  As far as jobs, there was 1 engineering job at NASA which required many more years of college & had a line of guys wanting to get in.  There is far more talent than demand.  Stock & buyout…


Facebook buys Occulus VR for $2 billion

Posted on March 25, 2014 at 5:12pm 13 Comments

Not quite the $15 billion they spent on Whatsapp last month, but still more than the $1.1 billion they spent on Instagram.  The speculation is for grand universes of virtual reality news feeds, virtual reality sharing of private UAV flights, but…


XV-11 lidar copter

Posted on March 13, 2014 at 10:00pm 10 Comments

The journey begins with 3 XV-11 lidar…


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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