Randy's Friends

  • igor 82
  • Thanh Pham
  • MinHyeok, Choi
  • Raibrinder Gohalwar
  • David E. Weekly
  • Nitzan Bar
  • Adolfo Rodrigues
  • James Mark Borgaily
  • Ygnts
  • john small
  • Tomoaki Torigata
  • Benoit Pereira da Silva
  • Kei Takahashi
  • Karim Ahmed
  • Michael Tsang

Randy's Groups

Randy's Discussions

ArduCopter-3.2 beta testing

Started this discussion. Last reply by Micha 5 hours ago. 819 Replies

ArduCopter-3.1 released!

Started this discussion. Last reply by Emin Bu on Friday. 1508 Replies

Running SITL on Windows

Started this discussion. Last reply by Steven McAdam on Tuesday. 48 Replies


Welcome, Randy!

Latest Activity

Micha replied to Randy's discussion ArduCopter-3.2 beta testing
"Good to hear you resolved it. :) Do you like the way it flies? I do ;)for my part i got in touch with Roberto,sent him the logs and he is looking into it."
5 hours ago
Fabio replied to Randy's discussion ArduCopter-3.2 beta testing
"Hello Micha, I solved I changed the ESC and everything is ok, for the calibration I made one at a time with the receiver. regards Fabio"
6 hours ago
Paul La Fors replied to Randy's discussion ArduCopter-3.2 beta testing
"sorry Rainer, but that's the batt part. I was talking about the throttle failsafe. As i did practice (without any luck) on :-(( "
6 hours ago
Roque CANALES replied to Randy's discussion ArduCopter-3.2 beta testing
"I confirm that rally point no work on PIXHAWK AC3.2.RC3, also when rtl is invoke by failsafe (battery) or manualy, drone start to climb....I switch to manual mode to stop climb.... RTL Alt is set at 15m and  I set rally point to 30m......"
7 hours ago

Randy commented on Alex Zarenin's blog post Yet another Flight Control Board
"Alex, One thing we've found with the Pixhawk is that it's good to actually use completely different accelerometers to reduce susceptibility to aliasing do to vibrations.  So if one runs at 800hz and the other at 1000hz it's less…"
14 hours ago

Randy commented on Chris Anderson's blog post Kickstarter project for quadcopter-based hoverbike
"If people actually start riding on their ArduCopter/Pixhawk copters it's really going to add to my stress level."
14 hours ago
Micha replied to Randy's discussion ArduCopter-3.2 beta testing
"Right, i did not change the firmware on the VRbrain. They came with 3.2 RC2. D'ont tell me there is a separate firmware version for SBUS and PPM? That could explain a lot.. About the esc's, have you tried playing around with the endpoints…"
15 hours ago
Fabio replied to Randy's discussion ArduCopter-3.2 beta testing
"Hello Micha, Yes, I also tried individually directly with the receiver, but the strange thing is that at the start and after the initialization of the flight controllers ESC start doing Beep, Beep as if there is no signal from the FC. Emile told me…"
15 hours ago
Roque CANALES replied to Randy's discussion ArduCopter-3.2 beta testing
"also I noticed that when switch back to auto mission mode after having paused, all the functions such as do_set  or condition_ commands are not reactivated, it would be possible to ensure that all (or the last ones) of the do_set_  and…"
16 hours ago
Roque CANALES replied to Randy's discussion ArduCopter-3.2 beta testing
"Hello Randy, below there's little issues that I'v seen testing AC3.2 on hexacopter. Condition YAW absolute ok but relative no work.(if I set 90° copter only achieve 30-45°) Does its normal that rally point no work when invoke from…"
16 hours ago
Micha replied to Randy's discussion ArduCopter-3.2 beta testing
"I always calibrate my ESC's manually. One by one. Just connect the esc to the throttle channel of your receiver. Power up the esc with your throttle stick up and when it beeps, move the sticks all the way down and you are done. I then check if…"
18 hours ago

Randy replied to Randy's discussion ArduCopter-3.2 beta testing
"Ah, except there's no way to connect it!  :-)  .. at least not on the PX4 or Pixhawk.  It may be possible on the VRBrain (i've heard Roberto say it is).  On the PX4/Pixhawk, we only support I2C based compasses and we…"
19 hours ago
Ravi replied to Randy's discussion ArduCopter-3.2 beta testing
"@chiristian, i think the rc3 supports third compass. the param list says third compass."
19 hours ago
Fabio replied to Randy's discussion ArduCopter-3.2 beta testing
"Hello Micha, I also have a micro vbrain 5 with the firmware ArduCopter-vrubrain-v51-PPM, the board of the second generation is fantastic circuit small and very well done, very light, great for a MicroQuad 250/300 mm. My problem is that I can not…"
20 hours ago
Tearig replied to Randy's discussion ArduCopter-3.2 beta testing
"Pm me"
Micha replied to Randy's discussion ArduCopter-3.2 beta testing
"I ordered one during the Maifair promotion. It's size and weight are great. When i got mine it was still in development. There where some small issues to take care off. Eventually i got another revision to try out. So now i have 2 of them. Next…"

Profile Information

About Me:
Lead developer of ArduCopter. I coordinate releases, provide support for users having trouble with their copters, add new features (most often based on ideas and suggestions from the community). I also help others get their code integrated into ArduCopter.

You can find numerous video tutorials from me here:
Please tell us a bit about your UAV interest
Interested in quads and helis mostly. I got my start in this field by reading the electronics tutorials from Sparkfun and from watching the success of Jack Crossfire's vicacopter. I've learned an enormous amount from the combined wisdom of the people on the DIYDrones forums and members of the core dev team including Jason Short, Tridge, Doug Weibel, Leonard and many more.
Karuizawa, Japan

Randy's Photos

  • Add Photos
  • View All

Randy's Blog

Red Balloon Finder

Posted on June 17, 2014 at 5:04am 30 Comments

As many probably know, this year's Sparkfun Autonomous Vehicle Competition (AVC) is similar to last year's except that a new challenge has…


GPS Glitch detection in AC3.1

Posted on December 14, 2013 at 6:42am 32 Comments

AC3.1 is going out very soon and includes a new safety feature called GPS glitch detection.  There's a wiki page about it but I'd like to highlight how it works because it's near the top of the list of safety issues.  The method…


Dropping a Rover from Hexacopter - Part III

Posted on August 22, 2013 at 7:40pm 30 Comments

As a follow-up to the rover drops #1 and #2 I spent a day with Assistant Professor Nagatani-san of…


UAVs for measuring radiation levels in Japan

Posted on April 11, 2013 at 6:38pm 11 Comments

Two years after the March 11th tsunami in Japan that triggered the Nuclear disaster at the Fukushima power plant, there are still just over 300 thousand people who have not been able to return to their homes due to…


Dropping a Rover from Hexacopter - Part II

Posted on March 15, 2013 at 12:32am 14 Comments

As a follow up to an indoor test we did a about a month ago (blog post here), Assistant Professor Nagatani-san of Tohoku University, Izu-san of…


Comment Wall (23 comments)

At 8:44am on January 5, 2011, Jack said…


I have been working on my own Quad with the NG code and have setup the Sonar and have it working very well . I have an indoor version with sonar and IR sensors and would like to know were the IR sensors are conected, what pins. I see you were working on implementing this so If you could help with basic setup I can try my hand at testing. Thanks for your work on the Sonar and good luck on the obstical avoidence.


At 5:47am on January 30, 2011, Kári Davíðsson said…

Thanks Randy. 

I do not have write access to the svn repository.

So I will send you the changed AP_ADC lib probably later today.

I am not sure if a circular buffer is needed. The beauty of a 1st order IIR filter is that we only need one "old" sample and if a second order is needed only two old samples. But I will look a little better into the filter selection before committing anything to you.

At 5:45am on August 24, 2011, Jiro Hattori said…

Hi Randy

 One of the way to introduce technology of arduino as IMU is that something like what you have done. Most of the Japanese model flyer love to fly traditional helicopter. 

 Another approach may be exhibit something very unique at MAKE fair at Tokyo Institute of Technology.  There will be many open source hardware and software freaks as well.

At 9:10pm on March 7, 2012, Ravi said…

hi randy, i had been following your forum for align450. i just got my APM2 purple. i loaded the ardu heli firmware. everythings looks to be ok on mission planner. but there is no PWM on servo out pins. i armed the APM2 and does gets armed. the radio callibration bars move proportionately. evrything seems to be OK. but in 'status' there is no PWM on channel out pins. it shows '0' PWM on all out channels. can uou please suggets what might be the reason. the APM2 works fine with arduplane and arduquad firmware. ravi

At 5:53am on March 16, 2012,


I had a different problem with my APM2 that I was able to solve by following the procedure found in the wiki with a search for APM board problems.  My board would not connect to the planner and it works now.

Good luck


At 2:18pm on May 15, 2012, wilson javier madrid sossa said…

hello hello hug.
I can help with anything, I did several plannings flight with tri and firmware 2.0.49 and flew very well.
I did a quad and install 2.5.4 program a waypoint flight and the team took off like crazy.WP PIDs are by default and does not really move as you do. can you give me some information.

I appreciate your help

At 4:41pm on May 16, 2012, wilson javier madrid sossa said…

Please can you help me. I was flying my quadcopter and hold position when you turn the team went to ground. these are the last two log. I appreciateprompt help.


At 3:54pm on September 29, 2012, Marooned said…

Hi Randy

After your changes to Optical Flow I'm having troubles with compiling the sources:

ArduCopter.cpp: In function 'void init_ardupilot()':
ArduCopter.pde:-1: error: 'SPI3' was not declared in this scope
ArduCopter.pde:-1: error: 'SPI3_SPEED_2MHZ' was not declared in this scope

I have spi3.h file include in ArduCopter.pde but somehow it's not working that way. I did fetch&rebase with original repo.

At 3:12pm on September 30, 2012, Marooned said…

Sorry for troubles. It's working now. Looks like Arduino IDE had some hiccup.

I should probably move to some better IDE as I'm using Arduino only for compiling/uploading and all files are edited in my fav editor and I have to restart Arduino every time I change something as it doesn't follow outside files changes.

Anyway, sorry for bothering you.

At 6:30pm on December 1, 2012,
William Premerlani

Hi Randy,

Regarding a question that Shyam asked about gimbal lock when he was trying to use APM to stabilize a camera, he and I finally solved the issue. Here is a link.

No one on diydrones was able to help Shyam, he finally contacted me directly.

Best regards,

Bill Premerlani

You need to be a member of DIY Drones to add comments!

Join DIY Drones


© 2014   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service