Developer

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Randy's Groups

Randy's Discussions

figuring out the Antenna Tracker

Started this discussion. Last reply by Michael Oborne yesterday. 5 Replies

ArduCopter-3.2 beta testing

Started this discussion. Last reply by Randy 5 hours ago. 858 Replies

ArduCopter-3.1 released!

Started this discussion. Last reply by Emin Bu Jul 18. 1508 Replies

 

Welcome, Randy!

Latest Activity


Developer
Randy replied to Henri's discussion Skycat parachute launcher for Drones
"Darrell,      Yes, that's a good point.  In fact, it is these missing self-checks that have likely led Fence to be as much a danger as it is a safety feature."
4 hours ago

Developer
Randy replied to Henri's discussion Skycat parachute launcher for Drones
"From my experiences with the fence I agree that sometimes safety features cause as many problems as they solve.  I've had lots of logs of people having crashes caused by false positives on the fence but actually many fewer reports of…"
5 hours ago

Developer
Randy replied to Henri's discussion Skycat parachute launcher for Drones
"As part of this parachute support I've added a "CMD_DO_PARACHUTE" command to MAVLink which could be sent to the smartboard from the flight controller if the flight controller wants to trigger the parachute release or if the pilot…"
5 hours ago

Developer
Randy replied to Henri's discussion Skycat parachute launcher for Drones
"The parachute deployment checks are here.  The chute will deploy if all the following are true: chute is enabled and motors are armed flight mode is not ACRO or FLIP vehicle is not landed (we are landed if motors are at minimum and we're…"
5 hours ago

Developer
Randy replied to Randy's discussion ArduCopter-3.2 beta testing
"Michael,      Txs for the report.  Leonard and I went through the defaults and maximums just after the -rc3 release and adjusted them and should have resolved this issue so you should see it fixed for -rc4.  Txs!"
5 hours ago

Developer
Randy replied to Henri's discussion Skycat parachute launcher for Drones
"If we're going for a smart parachute release board, I'd recommend a board that can understand MAVLink messages sent by the autopilot.  I know that makes it more difficult but there's a huge amount of useful information in there…"
6 hours ago
Michael replied to Randy's discussion ArduCopter-3.2 beta testing
"Just noticed this (AC 3.2-rc3) - ACCEL_RP_MAX is by default set above Maximum (126000 vs. 100000max). Is this correct or should it be set at/below 100000? "
9 hours ago
Roque CANALES replied to Randy's discussion ArduCopter-3.2 beta testing
"Randy, Have you checked my ac3.2 rc3 test results? from page 68 of this thread? "
13 hours ago
Artem replied to Randy's discussion ArduCopter-3.2 beta testing
"Randy, could you explain the algorithm how the alt hold works?"
yesterday
Hubertus Paetow replied to Randy's discussion ArduCopter-3.2 beta testing
"Randy, For the calculation: Because we are talking about a "Parallelogramm of forces" (dont know translaton) you should better use something like: ThrForAlthold(leanAngle) = ThrForALthold(level) / cos(leanAngle) Hubertus"
yesterday
Lior Zahavi replied to Randy's discussion ArduCopter-3.2 beta testing
"Thanks Edgar, i added you as a friend - can you share your findings on the thread i started? http://diydrones.com/forum/topics/stabilization-problem-with-disco-v-quad"
yesterday

Developer
Randy replied to Randy's discussion ArduCopter-3.2 beta testing
"Steve, Ok, well, if it's stabilize mode then it's quite a different issue.  This would be related to "angle boost".  Angle boost simply corrects using the lean angle.  So if the vehicle is leaned over at 45deg then…"
yesterday

Developer
Michael Oborne replied to Randy's discussion figuring out the Antenna Tracker
"no..... the hardware version."
yesterday
Steve Cain replied to Randy's discussion ArduCopter-3.2 beta testing
"Randy, For clarity, it appears to me that this is not necessarily only seen in baro dependent modes but that is where its most evident... I don't expect Stabilize to hold altitude, but If I fly around in stabilize, I usually have to end up…"
yesterday
Leonid Cherednichenko replied to Randy's discussion ArduCopter-3.2 beta testing
"Sorry, but I will can attach log only in a 2 weeks. I am not using autotune but my PID setup works fine at AC3.1.5 and AC3.2rc3 at all condition except breaking. Breaking looks like some overshoot while leveling horizont. Overshoot is soft at low…"
yesterday
Edgar Scott replied to Randy's discussion ArduCopter-3.2 beta testing
"Lior, Add me as friend and I can send you my PID info...also my dampener colors.  Note I also added the optional TBS stabilizer arm for the gimbal.  Or we can start a TBS thread so we can share with others. Here is how good I got it with…"
yesterday

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: http://www.youtube.com/channel/UCm393BzMOyRPUo8MtKp5alg
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.
Hometown:
Karuizawa, Japan

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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…

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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…

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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…

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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…

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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…

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Comment Wall (23 comments)

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

Randy

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.

Jack 

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,
T3
Aerhead
said…

Randy

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

Larry

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.

2012-05-16%2018-12-25.tlog

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,
T3
William Premerlani
said…

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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