"Definitely a trend of Chinese brands being able to charge luxurious prices. HTC had 1 of the 1st $800 phones. The quantitative easing era may soon bring the 1st $1000 propeller from GWS."
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Jack Crossfire
- San Ramon, CA
- United States
- Blog Posts (152)
- Discussions (119)
- Groups (2)
- Photos (305)
- Photo Albums (1)
- Videos (22)
Jack Crossfire's Discussions
EasyStar as a pure GPS UAV
Started this discussion. Last reply by Reto Oct 29, 2009. 7 Replies 0 Likes
Jack Crossfire's Page
Latest Activity
Jack Crossfire commented on Adam AKAV8R's blog post DJI has officially released the H3-2D Gimbal for $699!Jack Crossfire commented on Joshua Ott's blog post Thirty Days (#30): Tour of 3DR North"You need a brushless gimbal. "30 days" was fun. It should be permanent."
Jack Crossfire commented on Chris Anderson's blog post Parrot releases GPS module for AR.Drone 2.0"Desperately trying to avoid export restrictions by calling it a flight recorder & return to home pilot. Even DJI avoids mentioning waypoints for the Phantom."
Jack Crossfire commented on jasonshort's blog post Getting ready for Arducopter 3.0"The most important preparation for a new Arduproduct is rebranding the whole thing as Hobbyking & selling it at 1/2 the price with some chinese spelling. Would be interesting to measure its accuracy at 3pm in the city, between some…"
Jack Crossfire commented on Acorn's blog post DIY Passive Gimbal"No. It needs damping. Brushless gimbals dampen in software. Steadicams use a magic lubricant."
Jack Crossfire commented on Jason Hilton's blog post StabilGo Camera Gimbal"Interesting use of a tripod head for a hand grip. "
Jack Crossfire commented on David Dewey's blog post Flying 3D Spline Curves between Waypoints with ArduCopter 3.0"That was real smooth. The devil is in making all the ground station programs display the true path & deciding you're absolutely not going to want user defined bezier curves in order to commit to fixed polynomial curve. Why does no-one…"
Jack Crossfire commented on Joshua Ott's blog post AVC media"That must have been a 1 in a million day with no wind in the great divide. Interesting the copters spent the time turning to face the direction of movement & went with such a high altitude. "
Jack Crossfire commented on Joshua Ott's blog post Thirty Days (#28): McMaster-116 lift"You need a bigger copter."
Jack Crossfire commented on Chris Anderson's blog post "Distributed Flight Array""It needs to form the shape of a ninja, black sheep, or scorpion."
Jack Crossfire commented on IKE's blog post A view behind the scenes at TED Global, quadrotor “athletes” demo"Gesture recognition is getting almost Jedi like."
Jack Crossfire commented on IKE's blog post A view behind the scenes at TED Global, quadrotor “athletes” demo"That guy looks pretty serious. Don't get between him & a TED speech."
Jack Crossfire commented on Monroe Lee King Jr.'s blog post Definition of a drone"It makes a lot more money if it's called a drone. Got some drone jellybeans if you want em."
Jack Crossfire commented on Falcon UAV's blog post Virtual Sparkfun AVC Fly Around"Photogrammetry may one day be good enough to replace practical photography with 3D models. No source code, but nobody cares if it's good enough."
Jack Crossfire commented on Gary Mortimer's blog post AVC 2013"This was the 1st event where the robot technology was good enough that the lack of recording technology became a real drag. Onboard cameras might have been enough, but reduced the scores & winning is 3DR's bottom line even if they…"
Jack Crossfire commented on Gary Mortimer's blog post AVC 2013"The coverage is getting better. They had some cameras actually manned, with someone switching. There's still no ability to upload a recording of a complete run. Maybe next year they'll provide the 1st video of an…"
Jack Crossfire commented on ronin57's blog post Ninjacopters - New frame design"So which is a better copter: a ninja, a black sheep, or a scorpion?"
Jack Crossfire commented on Joshua Ott's blog post Drone Con today"Can hear about half of the 90 minutes of recordings. So this happened on a work day & the only way to see it was live."
Jack Crossfire commented on Joshua Ott's blog post Thirty days (#24): More new product previews"Can't wait for the 3 axis version."
Jack Crossfire commented on Joshua Ott's blog post Thirty Days (#23): New Product Preview"An all in one 3D printer/plastic injection machine/FLIR cam/brushless gimbal/blimp inflator/gesture sensor/ADS-B receiver, using battery breakthrough technology which packs 5Ah into the uBlox 6 battery, enough to power the raspberry pi for 5 minutes."
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.
- Tell us a bit about your UAV interest
- x
- Hometown:
- Pleasanton, Calif*
Jack Crossfire's Photos
Jack Crossfire's Videos
Jack Crossfire's Blog
The mini AR Drone
Posted on April 1, 2013 at 11:44pm 9 Comments 11 Likes
The copter flies away & returns to the starting point at 2 different altitudes, using only optical flow odometry for position & sonar for altitude. The fact that it landed at nearly the takeoff position was probably coincidence,…
Infra X teardown
Posted on March 4, 2013 at 8:00pm 2 Comments 5 Likes
As expected for an undamped, strictly proportional feedback system, it bounces off walls faster & faster until it crashes. It can't hover stationary, from the reflected IR. Walls not completely reflective, not completely seemless, or not orthogonal to the sensors are less effective.
To engage the altitude hold, fly above 0.2m & get it…
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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