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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 F. C. Bearsch "Tearig"'s blog post Rethinking the RC "Controller TX" - SuperMan FM Continued-
"Been there, tried that. If you are able to find an old used Spaceball 4000 with rs232 interface, the protocols are documented and it is almost plug and play to integrate into a microcontroller. But while the 3D mouse is great for CAD, doing…"
yesterday

Developer
John Arne Birkeland commented on Dez Socks's blog post WARNING :FTDI Drivers Are Killing Fake Chips(windows update)
"Robert & Richard, I completely agree with all you say about clone manufacturers and support. But that is not what append here. For some reason FTDI decided to target the end user who is an innocent in all this. The user has no way of knowing if…"
Sunday

Developer
John Arne Birkeland commented on Dez Socks's blog post WARNING :FTDI Drivers Are Killing Fake Chips(windows update)
"I see that FTDI has recalled the driver, but the damage is done. This has to be the most gobsmackingly stupid move ever created by a company. Attacking innocent users with no association to clone manufactures and destroying private property. How…"
Friday

Developer
John Arne Birkeland commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"That is true, but then again in a fixed pitch system the propeller hover RPM will usually not be the same as optimal motor RPM/load. Brushless motors usually have a narrow window where they reach maximum efficiency."
Oct 20

Developer
John Arne Birkeland commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"@Huges, a brushless motor system will at the very best have up to 90% efficiency. And there is lots of loss in the propeller also, especially during static hover. So adding more motors and propellers only adds up and increases the efficiency loss.…"
Oct 20

Developer
John Arne Birkeland commented on AKRCGUY's blog post How To Choose Your First Quadcopter
"Great video, but if you have no RC experience at all and this is to be your very first copter. Then the choice is even simpler. I see way to many people jumping in at the deep end and spending serious $$$ in crashes just to learn the basics. Learn…"
Oct 16

Developer
John Arne Birkeland commented on Quadzimodo's blog post Plexidrone - Latest Crowdfunded Drone
"There is no free lunch. Or perhaps more accurately, all lunches are free.. If they have based their system on APM, they have to share any derived work. This is the fundamental principle of open source and the GPL license. At the moment the silence…"
Oct 9

Developer
John Arne Birkeland commented on Patrick Duffy's blog post Part 2: How to build a High-Definition FPV UAV using a Rasperry PI with HD camera, using a high speed WiFi link
"I looked into this and the camera does 720p60 (1280x720). But I have been unable to find any reference to the h.264 hardware encoder supporting 720p60."
Oct 3

Developer
John Arne Birkeland commented on Patrick Duffy's blog post Part 2: How to build a High-Definition FPV UAV using a Rasperry PI with HD camera, using a high speed WiFi link
"If you can afford the bandwidth requirements, switching to 60fps video should help reduce latency. It would also be worth looking into how the rpi h264 encoder buffers data. It's common practice to use relatively large buffer queues to increase…"
Oct 2

Developer
John Arne Birkeland commented on Patrick Duffy's blog post Part 2: How to build a High-Definition FPV UAV using a Rasperry PI with HD camera, using a high speed WiFi link
"Correction. I forgot to convert from bit to byte when calculating the buffer-size. The 60K buffer-size should be 7-8K instead."
Oct 1

Developer
John Arne Birkeland commented on Patrick Duffy's blog post Part 2: How to build a High-Definition FPV UAV using a Rasperry PI with HD camera, using a high speed WiFi link
"Here are some suggestions that might improve GStreamer latency and robustness in your receiver pipeline. I have also included some Windows specific improvements, since I see that is the platform you are using. Original: udpsrc port=9000 !…"
Oct 1

Developer
John Arne Birkeland commented on Chris Anderson's blog post Commercial Drone Regulations: Canada vs the US
"Like some have mentioned, this is more a case of Canada being in line with the rest of the world.. In fact my country Norway just recently eased up on the requirements and defined commercial UAS operational limitations for different classes of UAS…"
Oct 1

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…"
Sep 26

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."
Sep 26

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."
Sep 24

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

John Arne Birkeland's Blog

Another multicopter crash into a crowd..

Posted on September 17, 2013 at 3:45pm 41 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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