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

Jack Crossfire posted a blog post

The autonomous Mars copter

The speech: https://www.nasa.gov/press-release/mars-helicopter-to-fly-on-nasa-s-next-red-planet-rover-missionMore details on kiwipedia:https://en.wikipedia.org/wiki/NASA_Mars_Helicopter_ScoutAfter decades of rumors about such a thing, which no-one took seriously, it was finally included on the next Mars rover. The…See More
May 12
Jack Crossfire commented on Chris Anderson's blog post Using LoRa radios for long-range RC
"About time something happened in the radio space, but if you need to know the bandwidth, you can't use it.  The general idea is longer range = lower bandwidth.  Still interesting to have a standard which allows consumers to push the…"
May 7
wrostek commented on Jack Crossfire's blog post The 1st fatality caused by a self driving car
"Hi Jack, do you have a link to "..downscaled, compressed copy of a video."? A lot of discussion here in GE about video is manipulated."
Mar 29

Developer
John Arne Birkeland commented on Jack Crossfire's blog post The 1st fatality caused by a self driving car
"Looking at the crash video, something was obvious very wrong with the system. Lidar and radar should both have detected the person long before she got in front of the car regardless of lighting conditions, and finally the visual system should have…"
Mar 27
Michal Podhradsky commented on Jack Crossfire's blog post The 1st fatality caused by a self driving car
"Wired has a great article that is related to this topic (in short - humans are pretty bad drivers, and they are even worse at  supervising self driving cars): https://www.wired.com/story/uber-crash-arizona-human-train-self-driving-cars/"
Mar 26
Andrew Rabbitt commented on Jack Crossfire's blog post The 1st fatality caused by a self driving car
"Thing is, you can take your own measures to avoid tree shredders.  If you choose to jump into the feed hopper, you're not really acting rationally and neither was this cyclist-cum-pedestrian. If the car had been being driven by a…"
Mar 25
Jack Crossfire posted a blog post

The 1st fatality caused by a self driving car

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…See More
Mar 25
Jack Crossfire commented on hiroshi takey's blog post [COMMUNITY] - Today, Ardupilot banned to me from and my related Ardupilot project.
"It's nothing compared to the number of blog posts diydrones banned."
Mar 25
C Miller commented on Jack Crossfire's blog post Skydiddy startup
Mar 15
Jack Crossfire commented on Chris Anderson's blog post Indoor positioning with OpenMV cam
"Sort of funny to see an ESP8266 module with a bag of cables connected to it, just to say the autopilot is on the copter.  "
Mar 15
Jack Crossfire commented on Jack Crossfire's blog post Skydiddy startup
"Casey took a break from middle age to review it.  He obviously reads the Jack Crossfire blog."
Feb 27

Developer
Sandro Benigno commented on Jack Crossfire's blog post Skydiddy startup
"Absolutely amazing!!! :O"
Feb 26
Juan Carlos Hdez commented on Jack Crossfire's blog post Skydiddy startup
"Very impressive"
Feb 24
Andrew Rabbitt commented on Jack Crossfire's blog post Skydiddy startup
"seriously impressive!"
Feb 21
Jack Crossfire posted a blog post

Skydiddy startup

Really impressive demos from Skydio in Redwood City. Quad copter startups have been hit or miss & it looks like the same pile of plastic scrap that every startup besides Apple produces, but what they showed here was exactly what I wanted to do for years, with ground vehicles. It looks like it could really navigate most of the mobs I have had to navigate manually. They showed it briefly flying in front of the athlete, despite not having prior information about where the athlete was going.…See More
Feb 21
Jack Crossfire commented on Kristaps Brass's blog post Lego Sorter [Prototype] by SPH Engineering
"$375 would buy a vibratory bowel feeder or a new lego set.   But it does have the words "neural network" in it."
Jan 2
Jack Crossfire commented on Chris Anderson's blog post FCC fines FPV dronemaker for illegal radios
"Specifically, it was because of a complaint, not an FCC van driving around searching for illegal products.  The complainer could have been a government agency using another frequency or an internet commenter vigilante.   The specific…"
Dec 24, 2017
Jack Crossfire commented on Chris Anderson's blog post DIY Drones at 85,000 members -- a look back at an extraordinary decade
"Interesting for a graph to show a fall in addition to the rise.  With 3D TV, virtual reality goggles, self driving cars, 3D printers, they only showed rising graphs, then they disappeared."
Jul 15, 2017
Jack Crossfire commented on Chris Anderson's blog post Intel cancels Edison, Joule boards
"It's about time it died.  Sparkfun & diydrones really laid it on thick with that one.  The raspberry pi zero W, for those who are persistent enough to find one, is a better deal.  With enough work, the ARM can run x86…"
Jun 22, 2017
Jack Crossfire commented on Jack's blog post Turnigy graphene review: can it increase flight time?
"As far as I know, graphene has never been produced in commercial quantities except in the minds of startup founders of 4 years ago.  They made batteries cooler by making them heavier."
Jun 8, 2017

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 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…

Continue

Skydiddy startup

Posted on February 20, 2018 at 3:54pm 5 Comments

Really impressive demos from Skydio in Redwood City. Quad copter startups have been hit or miss & it looks like the same pile of plastic scrap that every startup besides Apple produces, but what they showed here was exactly what I wanted to do for years, with ground vehicles. It looks like it could really navigate…

Continue

Make a software programmable fuse out of a 3DR BEC

Posted on March 2, 2017 at 9:17pm 0 Comments

Most power supplies these days have overcurrent protection, but for those of us too poor for anything besides a Mastech & who were left with an ancient, unused 3DR BEC after the world…
Continue

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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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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