Patrick Duffy
  • Male
  • Manor, TX
  • United States
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Patrick Duffy's Discussions

Arduplane 3.9 flyaway with bad compass

Started this discussion. Last reply by Ronald Pandolfi Dec 5, 2019. 11 Replies

Has anybody had the experience with a fly-away on v3.9, when there is a compass problem?  I tried RTL and my plane flew in the wrong direction, even with a good GPS lock, and I was unable to recover…Continue

Tags: away, Fly

Arduplane RTL crash Skywalker X8 plane.

Started Dec 24, 2015 0 Replies

I had a crash flying a big wing (Skywalker x8), when I hit the RTL switch, the plane started to pitch/roll wildly and crashed. The plane was flying at 30 meters, and the RTL altitude was set to 100…Continue

Tags: crash, Arduplane

Arducopter 3.2.1 throttle failsafe always lands, no RTL or continue mission.

Started this discussion. Last reply by Patrick Duffy Sep 18, 2015. 2 Replies

Does anybody have this problem? Throttle failsafe always lands with Arducopter 3.2.1 no matter what the setting is, RTL or Continue Mission.  I have tested this several times by hovering and just…Continue

Illegal drone use could threaten hobby

Started Apr 22, 2015 0 Replies

I saw this on the DrudgeReport report today:…Continue

 

Patrick Duffy's Page

Latest Activity

Ronald Pandolfi replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"You could test your theory by temporarily shutting off GPS during flight. With the EKF in Arduplane, it is unlikely you will notice much change in course if flying straight, so long as your compass is working reasonably well. Same is true with…"
Dec 5, 2019
Patrick Duffy replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"I'm pretty sure it had GPS lock at arm, but who knows?  I'm having to wait to do the grid search until I have time.  It's more about solving the mystery at this point, rather than just recovering the model.  My other…"
Dec 5, 2019
Andreas Gazis replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"It sounds very odd that it would fly to a false home since home is set to the arming location by default unless you had done some fairly surreal changes to the params. The only other way I can think of that this might have happened is if you armed…"
Dec 5, 2019
Patrick Duffy replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"Hello Ronald,     I can't say it flew straight away, but it did switch to RTL, as I could see the flight mode change on the display.  Another possible theory is that the home position was incorrect and it flew to a false…"
Dec 4, 2019
Ronald Pandolfi replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"Hi Patrick, We have experienced (too many) GPS glitches and compass failures, and none have caused straight and level fly away. Only times we have experienced straight and level fly away was with RC failure. Depending on the type of RC transceiver…"
Dec 4, 2019
Patrick Duffy replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"Chris, FBWA worked perfectly.  I think the GPS glitched.  But I may never know."
Dec 3, 2019
Patrick Duffy replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"Hey Darrell,    Yes, I've used aerial photos before to recover a lost model.  Unfortunately, I don't know exactly which direction it was flying, I couldn't see the ground through the video, it was foggy and I lost…"
Dec 3, 2019
Patrick Duffy replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"Andreas, I left the defaults alone with the compass so I don't think compass-learn was enabled.  I'll certainly do so in the future.   I had one fly-away years ago, but that was when Arduplane was first released.   It's…"
Dec 3, 2019
Darrell Burkey replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"Sorry that this happened. I know what a sick feeling it is to watch all your hard work totally out of control. If you were flying with a ground station then there will be TLogs available that might help in finding out what went wrong and where…"
Dec 3, 2019
Andreas Gazis replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"Do you have a telemetry log? I agree with Chris, sounds rather odd. I routinely ignore compass whining in planes but have COMPASS_LEARN switched on. In many of my flights, the compass is pointing totally wrong when on the ground, then I take off,…"
Dec 3, 2019

3D Robotics
Chris Anderson replied to Patrick Duffy's discussion Arduplane 3.9 flyaway with bad compass
"Probably not the compass. Did you try any other auto mode before the RTL, such as fly by wire or stabilize? "
Nov 30, 2019
Patrick Duffy posted a discussion

Arduplane 3.9 flyaway with bad compass

Has anybody had the experience with a fly-away on v3.9, when there is a compass problem?  I tried RTL and my plane flew in the wrong direction, even with a good GPS lock, and I was unable to recover because it went out of range of my transmitter before I could switch to manual.   Plane GONE!  Have no idea where it went.   Shouldn't EKF realize the plane was going the wrong way and drop the compass?  I thought that was the entire point of EKF.   Bad inputs are ignored.   It should be pretty…See More
Nov 30, 2019

Profile Information

About Me:
I am a Sr. Software engineer for ETS-Lindgren and work on antenna analysis software for the wireless industry.
Please tell us a bit about your UAV interest
I have a plane with ArduPilot, and am interested in development for this project.
Hometown:
Manor, TX

Patrick Duffy's Blog

Thermal Imaging for your Drone on a Budget

Posted on May 6, 2017 at 12:13am 69 Comments

This blog will describe how to add thermal imaging to your drone without breaking the bank! The above photo shows my drone with the thermal imaging camera, the FlirOne device, which is an inexpensive, lightweight thermal imaging camera designed for Android or IPhone devices.…

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Google Cardboard Head-Up Display for Android

Posted on July 12, 2016 at 2:26pm 17 Comments

Google Cardboard your Drone!

This is a new Android App for running a Heads Up Display on a SmartPhone using Google Cardboard glasses to hold the smart phone.

I have posted a free version on dropbox at …

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Chinese drone maker Ehang Inc. Unveiled World's first drone capable of carrying a human passenger.

Posted on January 6, 2016 at 4:26pm 43 Comments

LAS VEGAS (AP) — Chinese drone maker Ehang Inc. on Wednesday unveiled what it calls the world's first drone capable of carrying a human passenger.

The Guangzhou, China-based company pulled the cloth off the Ehang 184 at the Las Vegas Convention Center during the CES gadget show. In a company video showing it flying, it looks like a…

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Ford issues $100000 challenge for developers to create drone to vehicle communication system

Posted on January 5, 2016 at 8:00pm 27 Comments

Here's the :Link

The news release said, "CEO Mark Fields said a goal is to set up a system, for example, where a United Nations emergency worker could launch a drone from an F-150…

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Comment Wall (6 comments)

At 9:12am on January 28, 2015, Warren Fernandes said…

Hey Patrick,

The issues that we're facing are not really related to the video link, that's perfect. Our telemetry link that uses zigbee 900's for communication completely stops transmitting as soon as the plane takes off. The connection comes back as soon as the plane lands, also our plane is built out of carbon fiber which we assumed was blocking the signal from our top mounted antenna. However shifting the antenna to the bottom of the plane hasn't helped. We've range tested our zigbee's and they seem to have no problem communicating over long distances, which has left us quite puzzled. Do you have any idea why this might be happening? I'll sent you pictures of the plane tomorrow!   

At 10:34am on January 28, 2015, Patrick Duffy said…

Hello Warren.  I have a similar setup on one of my fly wings. 5.8ghz video / 900mhz telemetry with zigbee. It's an EPO foam plane, so I have no issues with the carbon fiber, however, you should not have an issue if the antenna is bottom mounted. I would be interested to see your setup. It does sound strange. Have you eliminated cabling problems or connector issues? From your description of the problem, it appears that the actual radiated power is very low and it works as soon as the receiver gets close to the transmitter on the ground. I would try just walking the plane away from the CGS to see when it drops. 

For my latest build, I have both video and telemetry going over 5ghz digital so I have eliminated the 900mhz and extra electronics/antennas.  Are you using analog video or HD? Maybe you should consider eliminating the 900mhz link altogether. 

At 12:50am on January 30, 2015, Warren Fernandes said…
We're using HD video and we're definitely considering using the wifi link to transmit telemetry. However, we wanted the two separate radio links as a failsafe. We've tested our 900MHz system at fairly large distances (~1km) and it works perfectly outside the aircraft. The problem only crops up when the electronics operate inside the airplane :P.
Thanks for the help, I'll send you pictures of our setup soon so that you get a better idea of what our setup looks like.
At 6:24am on June 4, 2015, Paul Meier said…

Hello Patrick, stumbled on this in the http://diydrones.com/forum/topics/3-km-hd-fpv-system-using-commodity-hardware tread:

http://www.msdist.co.uk/product_Ubiquiti-WispStation-M5.php

seems its the same specs as the bullet, no need to mod for the antenna

At 4:10pm on March 31, 2017, Ashley Webb said…

@Patrick, I have PI 3 but I can pick up a PI 2 if there are any issues with the image running on a 3. Thanks so much!!!

At 6:11am on February 7, 2018, Andreo Zak said…


Hello. Do you work with skywalker x8 model? I'm interested in wings or airframe. If they are available, I would have gladly purchased them. Also if you have accessories, I’m ready to discuss all the details.
Answer send me an email: rybak.uav1975@gmail.com

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