Jack Crossfire
  • San Ramon, CA
  • United States

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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

Greg Fletcher commented on Jack Crossfire's blog post Cars vs robots
"Maybe a flashing led or strobe on a 3.5' vertical stick would help with traffic visibility. As well as side vision cameras to detect a threat vehicle and stop the bot before the collision. A cardboard box on wheels doesn't help either as…"
Oct 24, 2019
Jack Crossfire posted a blog post

Cars vs robots

A scooter ran a red light at 25mph & smashed straight into it. Miraculously, only the wheel was smashed. He broadsided it & dragged it a few feet, but manely took out the food it was carrying. Scooters & bikes are in the grey…See More
Oct 22, 2019
Jack Crossfire commented on Echo G's blog post The Dumb-Battery Era is Over
"I2C sounds like mechanism envy, because everyone who programs a computer these days needs to have I2C on their resume.   Most of the smart batteries use a single wire interface."
Oct 7, 2019
Jack Crossfire commented on FusionFlight's blog post Introducing the JetQuad: Quad Jet-Engine VTOL Drone
"Microturbines have had a huge drop in prices in the last 10 years.  They used to be $5000 & only sold by Jetcat.  Now China sells them for $1500.  Surprising they have to be mounted horizontally.  That nozzle wastes a lot of…"
Sep 2, 2019
Ravi commented on Jack Crossfire's blog post What happened to open source tracking cameras?
"Pi based 'daisy' cam kit is available with open source raspbian code."
Jul 23, 2019
Jack Crossfire commented on Jonatan Domenech's blog post 50th man on the moon ANNIVERSARY
"There was a time when working on home made drones felt like the next moon program.  We were making the future.  400 ft up was halfway to anywhere.  Now, they're banned just about anywhere.  Real moon programs now are a lot…"
Jul 21, 2019
d j commented on Jack Crossfire's blog post What happened to open source tracking cameras?
"" but have never been used to produce any kind of content & never been replicated by any open source efforts. what about open-source SLAM class algorithms ?"
Jul 6, 2019
d j commented on Jack Crossfire's blog post What happened to open source tracking cameras?
"" follow me mode relied on following a GPS transponder worn by the subject.  Interested to implement follow me technology known from golf carts into motorized wheelchair. Any idea on how to start with ?"
Jul 6, 2019

3D Robotics
Chris Anderson commented on Jack Crossfire's blog post What happened to open source tracking cameras?
"Good point, Jack. Home security cameras do human track-and-zoom, but they too have low resolution sensors.  There's plenty of open source CV/AI code to detect and track humans (tensorflow, etc). How hard would it be to just drive a gimbal…"
Jul 6, 2019
Jack Crossfire posted a blog post

What happened to open source tracking cameras?

They began with the Skydio, a quad copter which could follow subjects through forests with only machine vision.  Today, subject tracking cameras based on machine vision have reached consumers in standalone packages, the facebook portal, the…See More
Jul 6, 2019

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

Cars vs robots

Posted on October 22, 2019 at 10:00pm 1 Comment

What happened to open source tracking cameras?

Posted on July 5, 2019 at 4:30pm 4 Comments

They began with the Skydio, a quad copter which could follow subjects through forests with only machine vision.  Today, subject tracking cameras based on machine vision have reached consumers in standalone packages, the facebook portal, the…


Impressive multicopter wing hybrid

Posted on January 7, 2019 at 2:20am 0 Comments

Finally, a novel wing rotor design which actually looks like it should fly.  It might only be the finished look instead of the usual carbon fiber rods & duct tape.  There's obviously still a torque problem on the wings, as it approaches higher speed.  It seems like a safer & more scaleable way of attaching many rotors than…


The 1st fatality caused by a self driving car

Posted on March 25, 2018 at 3:00pm 4 Comments

There has never been a fad held in as much secrecy as the self driving car craze. It's been 15 years of startups, yet no source code or algorithm has ever been released by anyone working on a full sized self driving car, while past generations were quick to release source…


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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