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Randy's Groups

Randy's Discussions

AC 2.9.1 vs 2.8.1 GPS accuracy

Started this discussion. Last reply by Craig Elder 23 hours ago. 291 Replies

ArduCopter 2.9 / 2.9.1 released

Started this discussion. Last reply by Mike R. on Wednesday. 3579 Replies

ArduCopter 2.8 / 2.8.1 released

Started this discussion. Last reply by Виталик Apr 13. 1355 Replies

 

Welcome, Randy!

Latest Activity


Developer
Randy commented on Scott Berfield's blog post Google Investing in Drone Tech
"Oh, I met these guys from Unmanned innovation at AUVSI last year.  They seemed like a happy and smart bunch of people mostly within a couple of years of graduating from college.  They were very open to discussing the details of copter…"
9 hours ago

Developer
Randy replied to Oliver G.'s discussion Is there a limit for DO_DIGICAM_CONTROL commands?
"I see.  But if the shutter servo timed to fire at regular intervals (say every 5 seconds) and the APM stored the lat+lon+alt into the dataflash as the shutter servo was triggered that would give you what you need right?  Of course…"
10 hours ago

Developer
Randy replied to Sergio Beltran's discussion pitch and roll small variation when gps is 3D Fix
"Here's a description of this on the Trouble shooting page here including a video.  We use the gps for centrifugal force compensation.  From AC 3.0 we will disable this while the copter is disarmed so you won't notice it anymore."
11 hours ago

Developer
Randy commented on Chris Anderson's group ArduCopter User Group
"Re, "where are we with ArduCopter 3.0", we're at release candidate #2 now which you can find here.  There was a temporary problem with the downloads area so initially I could only put rc2 into the old downloads area. …"
11 hours ago

Developer
Randy replied to Craig Elder's discussion APM Copter 2.9.1.b has been released
"Criro1999,      Ok, good stuff that it's working well for you.  I haven't tested the mediatek yet so it's especially good to hear about those results actually.      from 2.9.1b onwards the…"
11 hours ago

3D Robotics
Craig Elder replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"It's 5 Hz."
23 hours ago
Bill Bonney replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"I found this information interesting enough to go do some research. >Who puts an EEPROM on a device that doesn’t even use it? see Hardware Integration Doc  The design is an improvement on the GPS before, and I see…"
yesterday
Crashpilot1000 replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"From what i read the HK ublox is preset to NMEA but has an eeprom on board, so you can upload the 3DR-Ublox.txt with an ftdi and the ublox center. The only real catch is the cable wiring, like on some fpv ccd cameras they mix up the colors so the…"
yesterday
Harley Engholm replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"That is am impressive price for a ublox-is the installed firmware compatible with the apm?"
yesterday

Developer
R_Lefebvre replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"Now, hold on a second.... I don't know the timing of exactly who did what and when, but, the MB1200 *was* the recommended sensor for quite some time, as was the MB1260.  I bought two MB1260's and an MB1200 with my own money. They…"
yesterday
criro1999 replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"Thanks both of you for your answer."
yesterday

Developer
R_Lefebvre replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"Haha, somebody had to say it! :) Seriously though, people must remember that quads can be used for more than just hovering.  And I don't even hold the speed record.  I think it's DaveC.  He had one doing some ungodly speed…"
yesterday
Harley Engholm replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"If you are unhappy with the drifting around with the mediatek as I was, get the ublox and you will not be disappointed. My quad now drifts less than a meter and I no longer am struggling and spending time and effort trying to make the mediatek…"
yesterday
Crashpilot1000 replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"Because Ublox are dirt cheap and way better than mtk. http://www.hobbyking.com/hobbyking/store/__31135__NEO_6M_GPS_Module.html. Even with usb and TTL serial for the FC it is cheaper than you think: http://www.ebay.de/itm/271176495992 ...... end…"
yesterday
Radovan Breuss replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
"Thanks for clarification, Garrick. I have piece of copper board in my drawer, so Im going to tryout your shield. Another question is - If I set some parameters in GPS uBlox unit via U-center (for example pedestrian mode), is there any way how to…"
yesterday
criro1999 replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy
""GPS is always optional and NEVER a thing to desperately rely on... it's nice to have a working GPS but if not, who cares, just fly like always" Now my question is: is any reason to buy >2 times more expensive GPS (uBlox), instead…"
yesterday

Profile Information

About Me:
I have many years of programming experience in a variety of languages (C, C++, Java, Basic) but in the last year or so I've got hooked on programming an Atmel 128 and really enjoy the hardware side as well. Since mid to late '08 I've been slowly working away on a UAV helicopter with many ideas borrowed from vicacopter
Tell us a bit about your UAV interest
Interested in quads and helis mostly
Hometown:
Tokyo, Japan

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Randy's Blog

UAVs for measuring radiation levels in Japan

Posted on April 11, 2013 at 6:38pm 9 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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Dropping a Rover from a HexaCopter

Posted on February 11, 2013 at 8:48am 14 Comments

For those interested in using their multicopters to carry heavy objects you might be interested in the test that I performed today with Assistant Professor Nagatani-san of Tohoku university in Japan and Izu-san of…

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Hokuyo Laser Range Finder needs a home

Posted on December 25, 2012 at 9:32pm 18 Comments

I received a 2D laser range finder from the good people at Hokuyo more than 1 year ago.  My plan was to try to use it to improve ArduCopter's…

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Steps toward ESC feedback using SimonK

Posted on September 26, 2012 at 9:43pm 22 Comments

Most of the pro multicopter set-ups have feedback from the ESCs so the controller knows the status of the motors.  This is useful for all kinds of reason including:

    1. debugging the causes of crashes - the controller could log when a motor has stopped running.

    2. allows faster and better reaction to a motor failure perhaps saving you from a crash at least for…

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Comment Wall (15 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, 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, 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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Season Two of the Trust Time Trial (T3) Contest has now begun. The fourth round is an accuracy round for multicopters, which requires contestants to fly a cube. The deadline is April 14th.

A list of all T3 contests is here

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