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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 Droneshare now has No-fly Zones
"Create your own problems for the sake of publicity, I guess."
1 hour ago
Jeff Foster commented on Jack Crossfire's blog post The big 3 without editing
"While you're certainly entitled to your opinion of the workshop we put together for CreativeLive, the hijacked YouTube videos were not authorized to be published and have been reported.  "
1 hour ago
Jack Crossfire commented on Bob's blog post Amateur drone pilot finds man missing for three days
"Would have been interesting to see the downlink video of the find, but technical problems undoubtedly prevented that from being recorded."
3 hours ago
Mark Bateson commented on Jack Crossfire's blog post The big 3 without editing
"Creative live went to considerable expense putting these two days of training together so unless you already have permission from creative live, what gives you the right to hijack their content and place it on YouTube?"
12 hours ago
John Githens commented on Jack Crossfire's blog post The big 3 without editing
"The context of the videos is the Creative Live online course that was mentioned on this DIYD blog post. I attended most of the course."
13 hours ago
Oscar Avellaneda-Cruz commented on Jack Crossfire's blog post The big 3 without editing
"Wow. Nice find. Thanks for sharing."
21 hours ago
Jack Crossfire posted a blog post

The big 3 without editing

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 when we was at DJI. It was still definitely a choreographed team demo, looking a lot like a Vegas trade show. As with personal experience,…See More
yesterday
Jack Crossfire commented on Daniel Wibbing's blog post ObliX: multirotor-blimp-drone
"What does this have to do with politics?"
yesterday
Jack Crossfire commented on Chris Anderson's blog post Nice Hexo+ press
"The extra $300,000 was all in the sweater."
Monday
Jack Crossfire commented on Chris Anderson's blog post Legendary Java creator James Gosling at "Friday Funday" 3DR open house
"Still at the grindstone at age 59, which is good news for those of us who know we're going to need to work until age 70.  He's managed the tricky business of staying focused on software, rather than get caught up in electronics design…"
Monday
Jack Crossfire commented on Topher Kelly's blog post Free UAV Photography and Video course
"Why are webcasts now called courses & recorded versions now called on-demand with a $79 fee? "
Monday
Jack Crossfire commented on Chris Anderson's blog post Congrats to the Airdog team for breaking $1 million on Kickstarter!
"Has anyone made more money on kickstarter than they did back when there were jobs?"
Sunday
Jack Crossfire commented on Hugues's blog post How-To avoid sparks when connecting battery
"This must be the 1st time someone quoted a datasheet on diydrones."
Jul 16
Jack Crossfire commented on Jack Crossfire's blog post Secrets of the MPU9150
"The order needs to be// sleep mode & clock    hardi2c_write_device(&imu.i2c, IMU_ADDRESS, 0x6b, 0x01);// passthrough mode    hardi2c_write_device(&imu.i2c, IMU_ADDRESS, 0x37, 0x02);// I2C master…"
Jul 14
Jack Crossfire commented on Chris Anderson's blog post Private investigators using drones to catch cheating spouses
"Uh huh.  So how much is Google now going to buy out Harry Crumb for?"
Jul 13
A.H Saadi commented on Jack Crossfire's blog post Brushless direct drive rover
"Very cool! Congratulations"
Jul 13
Jack Crossfire commented on Chris Anderson's blog post DIY rover with independent 4-wheel electric drive
"All that money for a carbon fiber body, professional PCB fabrication, stock motors & ESC's definitely saves a lot of time."
Jul 12
healthyfatboy commented on Jack Crossfire's blog post Brushless direct drive rover
"Wow! This is definitely DIY stuff and excellent!"
Jul 12
emile 'butch' alline commented on Jack Crossfire's blog post Brushless direct drive rover
"Brilliant!  Wish more of us would share their experiences."
Jul 12
Antonie Kruger commented on Jack Crossfire's blog post Brushless direct drive rover
"HI Jack, That's brilliant work. Thanks for sharing. Let me see if I have this right - you ran 8miles on a 7.4V 900mAh battery. Assuming this, would I be right in saying that a 4x4 with this motor configuration would run 4miles and at least 2…"
Jul 12

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

The big 3 without editing

Posted on July 22, 2014 at 6:38pm 5 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…

Continue

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.…
Continue

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…

Continue

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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