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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 Chris Anderson's blog post New IR-tracking Kickstarter project for drones
"Had better luck with visible LEDs.  It doesn't work outdoors.  Overall, it sucks."
yesterday
Jack Crossfire commented on Andrew Tridgell's blog post Lidar landing with APM:Plane
"Does anything not go very well?"
Saturday
Jack Crossfire commented on Harry Olar's blog post A new cheap obstacle detector for robotics
"Been there, done that, but this is the kickstarter economy."
Thursday
Jack Crossfire commented on Chris Anderson's blog post Drones in The November Man, new Pierce Brosnan film
" Now 3D print a shroud like that.  Who is old enough to have heard of Pierce Brosnan?"
Wednesday
Jack Crossfire commented on Roberto Navoni's blog post VR micro Brain 5: The micro drone invasion began. Totally autonomous (VR Leash and integrated telemetry) , lightweight
"It sort of used his velocity to stay in front of him, but GPS accuracy still isn't there."
Aug 25
Jack Crossfire commented on RC Tech.se's blog post Iris Plus
"Testing Gopro aerodynamics to greater detail than ever before."
Aug 24
Jack Crossfire commented on cmiser's blog post First UAV Demonstration at a US Air Show (with FAA Consent!)
"Can't wait for the 1st RC plane flight at an airshow."
Aug 24
Jack Crossfire commented on Brennan Zelener's blog post Follow-Me Mode Test: Success!
"Few people have gotten this far.  Interesting to see what works & what doesn't.  You obviously can't run through trees, under powerlines, analyze biomechanics, or make a blockbuster with it.  It satisfies a maximum…"
Aug 19
Jack Crossfire commented on Jose Luis Cortes's blog post Huge quadcopters can be attractive alternative to fixed wing for mapping and survey
"3D printing is obsolete.  Google just invented the wood programming language.  What used to take 5 days & a $1000 printer now takes only an hour & $100 of hand tools.  It's insane how wood is reshaping the micro maker…"
Aug 18
Jack Crossfire commented on F. C. Bearsch "Tearig"'s blog post Another Pixhawk Clone...
"Goodluckbuy isn't as good as banggood, because banggood is just plain bang good."
Aug 12
Jack Crossfire commented on Chris Anderson's blog post Amazing new post-processing video stabilization technique from Microsoft Research
"The fact that they can't easily produce a user app looks like a lot of manual intervention was required, but not to worry, they've partnered with 3DR."
Aug 11
Jack Crossfire commented on Toby Mills's blog post Sense and Avoid Explained
"There's certainly a lot of hope that every RC pilot is going to wait the 45 seconds required for their uBlox to get a lock before flying & their uBlox is going to be fully functional.  Depending on the stock market, hope can be good…"
Aug 10
Jack Crossfire commented on Chris Anderson's blog post Pixhawk-based VTOL aircraft code now available
"Has anyone gotten autotune + follow me + terrain following + VTOL transition + kalman filter simultaneously working in the same load?"
Aug 7
Jack Crossfire commented on MHefny's blog post ZERO_PID Tunes for Multirotors Part#2
"With the final frontier being automatic calibration of the loiter PIDs, the whole thing may one day calibrate itself."
Aug 7
Daniel Nugent commented on Jack Crossfire's blog post Analysis of the follow cam problem
"It might be GPS + baro??? GPS altitude isn't very accurate. You are right, it looks very fast and smooth, however, it stumbles when the target changes direction. GPS has a slow update rate, so I am guessing they extrapolate the target position…"
Aug 6
Darrell Burkey commented on Jack Crossfire's blog post Analysis of the follow cam problem
"@Daniel - You are right. The Solo is so fast I thought they were doing something special but as you say it's based on GPS. I think it might even use 2.4 for communication which would be bad for us eh? "
Aug 6
Daniel Nugent commented on Jack Crossfire's blog post Analysis of the follow cam problem
"How does solo shot work? I was under the assumption it used GPS or GPS + Inertial solution."
Aug 6
Darrell Burkey commented on Jack Crossfire's blog post Analysis of the follow cam problem
"I think using GPS for follow me isn't  a very good idea. Optical techniques are just crazy for complexity. Here's  a fairly simple and cheap solution: I wonder how a Solo Shot would handle being mounted on a multirotor? Hmm,…"
Aug 5
Mathew krawczun commented on Jack Crossfire's blog post Analysis of the follow cam problem
"you don't want to go high quality camera if you want better real time tracking you want to go low quality camera. bugs have been navigating the world with something like 180 pixels cameras for longer than mankind has existed. higher quality…"
Aug 5
Bobby commented on Jack Crossfire's blog post Analysis of the follow cam problem
"NICE IDEA"
Aug 5

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

Analysis of the follow cam problem

Posted on August 4, 2014 at 1:00pm 11 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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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…
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Lipo teardown

Posted on April 18, 2014 at 1:51pm 9 Comments

Tore down a completely puffed, dead, 0V cell.  It was still air tight.…
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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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