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Randy's Groups

Randy's Discussions

PixRacer with Ardupilot

Started this discussion. Last reply by Marcell Kovacs 5 hours ago. 986 Replies

Ardupilot on QC Snapdragon

Started this discussion. Last reply by SANGYUN HWANG Jun 2. 6 Replies

Pixhawk 1MB flash limit

Started this discussion. Last reply by Mark Brummett May 11. 85 Replies


Welcome, Randy!

Latest Activity

Marcell Kovacs replied to Randy's discussion PixRacer with Ardupilot
"Hi again. Somehow 3 4rc1 does not work for me. 3.3.x stable does, but im missing the wifi option a bit. I can only connect to it only right aftter boot. Boot log tells no px4io board found. Do u maybe have a wrong firmware downloaded by mission…"
5 hours ago

Hugues replied to Randy's discussion PixRacer with Ardupilot
"Strange question. Pixracer runs ardupilot fine as this thread shows it."
6 hours ago
Marc Dornan replied to Randy's discussion PixRacer with Ardupilot
"Is onshit125 a step up from oneshot125?   In all seriousness though you are suggesting that even for bigger machines (non racers) we should be going this direction. Do you think Spyder 40A Optos are worth acquiring as I need to 40A ESCs…"
9 hours ago
Allen Merrell replied to Randy's discussion PixRacer with Ardupilot
"I too at first thought it was esc sales hype and kept on flying with old junk until I got to feel the difference with a friend's FPV. Now I am a believer . The demands that have been put on esc's and motors by these guys has pushed the…"
11 hours ago
Artem replied to Randy's discussion PixRacer with Ardupilot
"Hm, its DEFINITELY not hype, I've enabled onshot125 and all I can say is WOW! Throttle control in Stab is night and day.... it was the first time in 3years I fly AC That I am able to hover at the same altitude for more than 15-20sec on the same…"
15 hours ago
Otto Küng replied to Randy's discussion PixRacer with Ardupilot
"Hi Cala, The same with my Frame F550, Mots 2212/920 (original DJI) 1.8 kg Hoover with 45% Has nothing to do with oneshot or hight kv motors. I will post it on the recommended link. Otto "
17 hours ago
Artem replied to Randy's discussion PixRacer with Ardupilot
"well, if you take time to read the results page of the MQTB its in line with what I've posted based on my experience.   the mentioned ESC is rather cheap $13, so should be relatively painless to check it out. just let me tell you, before I…"
Allen Merrell replied to Randy's discussion PixRacer with Ardupilot
"You might be better off checking the real time facts and proof posted here. This info comes from people who stretch esc's, motors and props to their absolute limits FPV racing. Their was never any real proof posted on…"
Artem replied to Randy's discussion PixRacer with Ardupilot
"Huge, don't bother since than a lot has changed, the best ESCs right now are the ones which are able to run BLHeli_S (Small_Throttle_Steps) with both sides having fast n-gates, they have the motor PWM synchronized with MCU master clock, so…"

Hugues replied to Randy's discussion PixRacer with Ardupilot
"Here on diydrones, this post is very interesting: "
fred flintstone replied to Randy's discussion figuring out the Antenna Tracker
"are you under tin roof ?"

Craig Elder replied to Randy's discussion figuring out the Antenna Tracker
"I have reproduced this issue and have some tlogs showing the error occurring. Now we need to figure out why. "
Allen Merrell replied to Randy's discussion PixRacer with Ardupilot
"Yes, I would like to see this test paper, It is very funny why you can see and feel the difference when it is in the air. Their is some very good information posted by QuadMcfly where he did test on most all esc's and motors too and posted…"
Luis Vale Gonçalves replied to Randy's discussion PixRacer with Ardupilot
"Great!!We'll be happy to see those Pull requests"
Kitsen13 replied to Randy's discussion PixRacer with Ardupilot
"To be sure that refresh rate is 400hz (gyro, pid, pwm output chained), some tests are needed. I have take a look in the code but thinks are not that much readable. Multi loops with multi call... A little study has to be done before tests. i'm…"
Otto Küng replied to Randy's discussion PixRacer with Ardupilot
"@Hugues, ....Ardupilot has not been designed with FPV racing..... Do you mean, in this case Ardupilot ist not usefull for the PixRacer? "

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

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Randy's Blog

Copter-3.4 beta testing starts

Posted on May 30, 2016 at 10:30pm 19 Comments

Copter-3.4-rc1 has been released for beta testing and can be downloaded using the Mission Planner's Install Firmware screen's beta firmware link.  Some of the changes since Copter-3.3.3 are listed below.

1) EKF2 allows "boat mode" (attitude initialisation without gyro calibration)

2) …


Terrain Following Missions using Lidar

Posted on May 13, 2016 at 11:30pm 24 Comments

The upcoming Copter-3.4 release will include terrain following support for mission commands using either Google earth altitude data or a Laser Range Finder.  This is a demonstration video shot at a ski hill near my home in Karuizawa Japan of this new feature.

For this test I used a venerable 3DR IRIS with a …


Copter-3.3 released!

Posted on October 8, 2015 at 9:58pm 84 Comments

After months of testing by the beta-testing team and no significant issue during the soft release, Copter-3.3 has been released.  You can load this version onto your vehicle using the…


Copter-3.3 ready for wider use

Posted on September 28, 2015 at 7:18pm 82 Comments

After months of testing by the beta-testing team, Copter-3.3 is ready for wider use.  Similar to the Copter-3.2 release this is a "soft launch" meaning that for the next couple of weeks, we are asking users to load the new version using the Mission Planner's "Beta firmwares" link…


NAVIO+ Linux board with APM:Copter 3.3

Posted on June 3, 2015 at 12:00am 23 Comments

Click here to skip the commentary and just see the vehicle flying.

The video above shows my first attempt (which was successful) to fly APM:Copter using a Linux board (…


Comment Wall (32 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

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