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John Arne Birkeland
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  • Norway
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John Arne Birkeland's Groups

John Arne Birkeland's Discussions

Problem maintaining pitch when accelerating / decelerating.

Started this discussion. Last reply by Michael Zaffuto Jul 2, 2010. 29 Replies

Servo problem with the new red (328) cards?

Started this discussion. Last reply by Chris Anderson May 3, 2009. 22 Replies

 

John Arne Birkeland's Page

Latest Activity


Developer
John Arne Birkeland commented on Sunil Shah's blog post Drones at UC Berkeley: Real-time Image Processing (Part 1 of 2)
"Very interesting article. Regarding the costly medium blur filter. If all you need is a low pass filter to remove sensor noise, there should be no need to perform a true median blur like medianBlur() in OpenCV. Use boxFilter() instead, or fake a…"
Friday

Developer
John Arne Birkeland commented on Gary Mortimer's blog post Congratulations Canberra UAV, stunning Outback Challenge win
"Any better then this, and you risk "killing" Joe by dropping the bottle on his head."
Friday

Developer
John Arne Birkeland commented on Rob_Lefebvre's blog post Arducopter Flies Gas Powered Helicopter
"When hot glue is not enough but I still want the possibility to remove it later. I use liquid tape. http://www.plastidip.com/home_solutions/Liquid_Tape For a permanent fix, nothing beats epoxy."
Wednesday

Developer
John Arne Birkeland commented on Chris Anderson's blog post How 3DR tests camera gimbals
"Electronic (digital) image stabilization only has some hard limits that you cannot get around, like motion blur caused by quick camera movements. The best approach is a hybrid system where you combine optical (mechanical) and electronic…"
Sep 19

Developer
John Arne Birkeland commented on Chris Anderson's blog post Pocketcopter project on Indiegogo
"There is actually two "height of overinflated expectations" hitting at the same time here I think. The obvious drone one, but also the one about crowd funding. "
Sep 17

Developer
John Arne Birkeland commented on Chris Anderson's blog post 3DR announces partnership with Intel on Edison for Linux-based companion for Pixhawk
"Overall the Edison looks like a nice deal. The x86 means easy development and it has lots of connectivity built in. But it is not a powerhouse. Having a under-clocked Atom, there clearly are more powerful solutions available if you are into heavy…"
Sep 12

Developer
John Arne Birkeland commented on Chris Anderson's blog post New Dyson robot vacuum has 360-degree SLAM camera tech
"The geek in me loves the 360 camera tech, but the pragmatic side just screams overkill. A vacuum robot only needs to know the room layout at it's own base height. I.e. it needs to know if it will fit under the couch of not, and if there are any…"
Sep 6

Developer
John Arne Birkeland commented on Chris Anderson's blog post New Dyson robot vacuum has 360-degree SLAM camera tech
""are becoming"? We are decades past when patents stopped being a incentive to protect inventors, and instead become a tool for big corporations to combat competition (aka innovation)."
Sep 5

Developer
John Arne Birkeland commented on Chris Anderson's blog post New Dyson robot vacuum has 360-degree SLAM camera tech
"I got the Neato XV running in my workshop and it does a great job. Neato was the first company to do active room scanning and path planning using a laser range finder, instead of the brute force pattern attack used by the more well known Roomba…"
Sep 5

Developer
John Arne Birkeland commented on Gary Mortimer's blog post LiDAR for $7999!
"It is worth nothing that the price reflects this being a true LiDAR sensor with a 360deg horizontal and 30deg vertical scan. Resulting in a true 3D point cloud of the surroundings (press release claims 300,000 points/sec). Most hobby range sensors…"
Sep 4

Developer
John Arne Birkeland commented on Austin H's blog post Micro Aerial Vehicle GPS denied navigation
"The Parallella has great potential (I have 2 of them from the kickstarter), and the multi core design is very well suited for visual computing. But the 16 core DSP is not generic. You would most likely have to redesign the SVO algorithm in question…"
Sep 3

Developer
John Arne Birkeland commented on Austin H's blog post Micro Aerial Vehicle GPS denied navigation
"They reference the ODroid-U2 at page 6 in the paper."
Sep 2

Developer
John Arne Birkeland commented on Austin H's blog post Micro Aerial Vehicle GPS denied navigation
"Nice variation on more traditional SLAM. Having just quickly browsed trough the presentation, it seems that have been able to greatly optimize the computations needed by assuming that the camera will always be looking downwards, which makes much…"
Sep 2

Developer
John Arne Birkeland commented on Tipu's blog post Hobbyking seems "Serious" now
"Prop data is only meant as a indication of expected performance. The moment you change propeller brand you get different behavior. Only way to be sure, is to do actual tests with the combination you plan to use. "
Aug 29

Developer
John Arne Birkeland commented on Harry Olar's blog post A new cheap obstacle detector for robotics
"The time it took from me reading this post to having backed the project, was a matter of seconds.. I would also gladly pay double for a 360 version. In fact I think a 2 piece Kickstarter option for combining two unit into a 360 scanner would be a…"
Aug 27

Developer
John Arne Birkeland commented on Tim Haynie's blog post Should We Let the Drone Hype Run Its Course?
"Considering the ramifications FFA actions can have on our R/C and UAV hobby in general, I think it is only natural that it get's a lot of attention. And don't think that just because you and me aren't located in the US, that it will…"
Aug 27

John Arne Birkeland's Blog

Another multicopter crash into a crowd..

Posted on September 17, 2013 at 3:45pm 42 Comments

So it happened again, and it will continue to happen until people realize this technology is far from mature enough to be used for such tasks.

Aside from endangering peoples lives, the public opinion created from such incidents will be very damaging and contribute to overly restrictive UAV laws in…

Continue

Two-Stage Copter

Posted on December 28, 2012 at 7:00pm 10 Comments

This video was just posted by EndOfDays, a well known figure in the photo/video multicopter scene.

And for the record, let me just say that some people have WAY to much free time. :)

ZeroUAV YS-X4 teardown

Posted on December 25, 2012 at 4:30pm 9 Comments

So no completely trusting that Santa had gotten the message, I made sure that there at least was one present under the tree that I would like.

The YS-X4 is the latest multi-rotor autopilot from ZeroUAV, and their entry into the…

Continue

Teensy 3.0

Posted on October 11, 2012 at 2:17am 15 Comments

Just a heads-up that Teensy my favorite small form factor Arduino compatible board, just got a solid upgrade with the…

Continue

Parallella: A Supercomputer For Everyone (Kickstarter)

Posted on September 29, 2012 at 10:50am 11 Comments

I just want to give a shout about a Kickstarter project that I think deserve some…

Continue

Comment Wall (7 comments)

At 3:30am on April 17, 2011, thomas marschall said…
Hei

Fant deg her på diydrones og tipper du har arducopter? Jeg prøver å kartlegge antall piloter i Norge for
å skrive en artikkel om dette.

Også skal vi i løpet av året organisere en arducopter / uav dag og du er kanskje interessert?
--

Vennlig hilsen / with regards

Thomas Bjørn Marschall

At 3:31am on April 17, 2011, thomas marschall said…
Hei

Fant deg her på diydrones og ser du kanskje har arducopter? Jeg prøver å kartlegge antall piloter i Norge for
å skrive en artikkel om dette.

Også skal vi i løpet av året organisere en arducopter / uav dag og du er kanskje interessert?
--

Vennlig hilsen / with regards

Thomas Bjørn Marschall
At 6:31pm on April 17, 2011,
Developer
John Arne Birkeland
said…
Heisann. Har vel strengt tatt ikke et arducopter da jeg liker å bygge mest mulig selv, men flyr quad mm. ja. :) Noe samling høres moro ut.
At 9:30pm on September 1, 2011, Ravi said…

Hi john, i am able to get PPM output from a PIN of Thomas Scherrer 12 channel receiver. is the PPM sum signal compatible with the ATmega2560 PPM decoder or i have to decode it through a interface. actually i am more of an aircraft engineer and less of a electronic engineer. the signal is coming from a Futaba 7C Tx onto a 12 channel thomas Sherrer Rx on 12 channel pin. can i give it directly to PIN 1 of APM after shortening PIN 2 &3 or i have to use an interface using PPMencoder. please help. i am currently using APM2.23. thanx, ravi

At 3:43am on September 2, 2011, Ravi said…

Hi john, i tried giving PPM to channel 1 PIN of APM and shortend PIN 2 & 3. did not work. I am not getting PWM out to servoes. Thomas Scherrer Rx takes PPM pulse from Futaba 7C Radio. It has a UHF RF Module which has been connected to the PPM out of Futaba 7C, this drives a 12 channel Rx also designed by Thomas Scharrer. I think the PPM pulse form futaba 7C should pass on as it is to the Thomas Scharre Rx which has a PIN for direct PPM out? what should i do next.

At 7:33am on August 18, 2012, Adam Scriven said…

Hey John!

Do you have any updates on Crawler1? What do you think of the Redcat Rockslide 1/8th? How does it hold up to your use/abuse? One of the things about the RS is that the only place making after-market parts for it seems to be RedCat itself, not many 3rd party manufacturers. Has that been a problem?

Thanks for any updates you can provide! ;)

At 8:33am on April 15, 2013, baufay patrick said…

Mister.
I seek information for zero ys-x4 wiffi
you to be able to help me if me question poses has you
I thank you for answer
I am of Belgium
patrick.baufay@skynet.be

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