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 Chris Anderson's blog post Hack/Race DIY Robocars this weekend in Oakland
"They did a good job clearing out the homeless people"
Saturday
Jack Crossfire commented on Bart Theys's blog post Which one has the highest range: VTOL, helicopter, multi-rotor (or flying squirrel?)
"Suspect flying squirrels will provide wifi to starving ethiopians before Alphabet corporation."
Jan 12
Jack Crossfire commented on Chris Anderson's blog post Volta extends from drones to autonomous cars
"They claim this is the BASE-1 rover driving itself: https://www.youtube.com/watch?v=GiE-ETVy7ok completely with just the webcam.  For the 1st time in 11 years, there's no mention of GPS.  It doesn't do a good job staying to the…"
Jan 7
Jack Crossfire commented on Chris Anderson's blog post Pixhawk-powered ornithopter
"Impressive that the IMU still worked.  Still can't see any value in an autonomous ornithopter.  At least manual control gives you a vicarious feeling of being an animal."
Jan 5
Jack Crossfire commented on TenzinR's blog post Human Flying Drone
"https://www.youtube.com/watch?v=oM-7h5I9yyA He finished the 360 video, but none of the airborne footage came out. "
Dec 23, 2016
Jack Crossfire commented on TenzinR's blog post Human Flying Drone
"Too bad he never mentioned how long it took to recharge between takes. Having the human underslung is the 1st practical arrangement.  All the others had blades on the verge of slicing the human.  He also got higher than anyone else."
Dec 21, 2016
Jack Crossfire commented on Chris Anderson's blog post Measuring airspeed without an airspeed sensor
"It's basically a flight simulator which uses machine learning instead of aerodynamics & newton's equation.  The reason airliners can't use a flight simulator to double check their instruments is the amount of certification…"
Dec 17, 2016
Jack Crossfire commented on Collette Gregory's blog post Velodyne $50 U.S "Breakthrough" Solid State Lidar
"The press release was http://venturebeat.com/2016/12/13/velodyne-lidar-announces-breakthrough-design-for-miniaturized-low-cost-solid-state-lidar-sensors/ Basically, they're integrating the emitter & receiver on a single 4mm x 4mm $50…"
Dec 14, 2016
Jack Crossfire commented on Chris Anderson's blog post Audi uses 1/8th scale autonomous rover to test full-size self-driving sofware
"Instead of simulating a 1:8 car on a 1:8 parking space, they should simulate a 1:64 car on a 1:8 road, with simulated shadows & obstacles.  It would accurately simulate the autonomous car most of us will actually have: a 1:8 car on a normal…"
Dec 8, 2016
Jack Crossfire commented on Chris Anderson's blog post Detailed Mavic teardown
"Interesting how the IMU has evolved from being randomly scattered on the mane board to being encapsulated in a very large, weighted, shock dampered enclosure, connected by a very long ribbon cable to reduce coupling.  It matches what some guys…"
Nov 21, 2016
Jack Crossfire commented on Jose Luis Cortes's blog post 2 hours and 5 minutes test flight with maximum takeoff weight
"About time someone finally did it.  The biggest challenge was getting a generator powerful enough in a small enough space. "
Nov 20, 2016
Jack Crossfire commented on Chris Anderson's blog post A few photos from the fun DIY autonomous car hackathon today
"Got another shot of the track, in case anyone was inspired by line following problems.  The bathroom & drinks were desperately needed by those of us running 10 miles with our robots, helas all the bigwigs were gone when we got there.…"
Nov 14, 2016
Jack Crossfire commented on Chris Anderson's blog post Congrats to the Aerotenna team for winning sense and avoid competition!
"The uSharp senses distance in 8 directions, up to 40m, at 100Hz.  It could be used for indoor mapping."
Nov 11, 2016
Jack Crossfire commented on Chris Anderson's blog post Some good (painful) physics lessons in trying to put a 360 video rig under a drone
" Tried that kind of mounting, 10 years ago.  The landings are obviously much easier with modern quad copters.  "
Nov 9, 2016
Jack Crossfire commented on Andy Osusky's blog post Autonomous Boat to Cross the Atlantic Ocean
"The best obstacle avoidance system is a "keep clear" sign. "
Oct 27, 2016
Jack Crossfire commented on Chris Anderson's blog post Using Microsoft Azure cloud to make a face-finding, voice controlled drone
"How much does Microsoft charge per 1000 blog comments?"
Oct 25, 2016
Jack Crossfire commented on luke cooke's blog post Is DIY Dead?
"Even with prices bottomed out at $1000 for the last 5 years, the latest flight controllers are good enough that getting the same results on your own would cost more.  You're not going to get competitive results with the 10 year old carbon…"
Oct 20, 2016
Jack Crossfire commented on Chris Anderson's blog post DIY Drones at 81,000 members (and Ning update)
"About time that buyout finally got taken care of. "
Oct 16, 2016
Jack Crossfire commented on Chris Anderson's blog post Sparkfun Autonomous Vehicle Competition recap video
"Presumably they're manely using machine vision with some using dead reckoning & GPS. The real value is knowing who the best were & what algorithm they used.  They only show who the best were."
Oct 11, 2016
Jack Crossfire commented on Chris Anderson's blog post An autonomous RC car guided by TensorFlow machine vision
"What it's probably doing is recalling the steering commands from a library of past images rather than interpreting the position of the lines.  Tensorflow is the new SURF.  Despite getting a lot farther than mistaking his laptop for a…"
Oct 11, 2016

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
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Hometown:
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…

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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…

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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,…

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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…

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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.…





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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:

http://www.sparkfun.com/commerce/product_info.php?products_id=8889
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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