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Doug Weibel
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  • Longmont, CO
  • United States
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Doug Weibel's Discussions

Lots of boards for sale

Started this discussion. Last reply by Doug Weibel Nov 19, 2012. 2 Replies

APMega - 1.0.1 alpha now in the repository

Started this discussion. Last reply by Uwe Gartmann Aug 16, 2010. 19 Replies

 

Doug Weibel's Page

Latest Activity

Max van Daalen commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Thanks Doug! I've wrestled with Allan variance in the past when deciphering gyro data sheets, hopefully it won't come to that again. Assuming I can get all of this working, I'll try it with both parts. I'd like to use the -P…"
Aug 19

Developer
Doug Weibel commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"It could affect the pseudo range, Doppler and carrier phase measurements , but the extent to which it would I don't know.  Velocity measurement assumes there is a drift rate in the RX clock.  If the regular XO clock drift is nicely…"
Aug 18

Developer
Doug Weibel commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"It could affect the pseudo range, Doppler and carrier phase measurements , but the extent to which it would I don't know.  Velocity measurement assumes there is a drift rate in the RX clock.  If the regular XO clock drift is nicely…"
Aug 18
Max van Daalen commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Hi Doug, I just realized that the NEO-7P doesn't have the more stable TCXO oscillator as found in the -T parts. Do you have any idea if this will affect the measurement of the carrier phase? As my order hasn't shipped I'm…"
Aug 18
Max van Daalen commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Many thanks Doug! That makes sense and doesn't sound so bad. The acceleration aspect you mentioned is interesting, hopefully for my application it's not going to be a problem as I'm just intending to use the approach to maintain…"
Aug 17

Developer
Doug Weibel commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Hello Max, At each measurement epoch the receiver clock error is modeled as a fixed drift rate (s/s).  This is all that is possible/needed as the velocity solution is a least squares calculation using data from a single measurement…"
Aug 17
Max van Daalen commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Doug, do you have any further details that you can share on how you modeled the receiver clock errors in your calculation? I ask as I'm just about to have a go at recreating your experiment. I'm doing this for mostly for fun but…"
Aug 15

Developer
Doug Weibel commented on Roger Sollenberger's blog post Dronecon 2014 Call for Submissions!
"Serious?  DroneCon is not before/after AVC???"
May 13

Developer
Doug Weibel commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"I have configured the SP0 pin per the data sheet for the next-to-LSb to be zero and have tried 0xB0 and 0xB1 in accordance with the data sheet which may of course be wrong.  I can set up to just bang all the addresses and look for a response…"
Mar 18

Developer
Doug Weibel commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"Hi Nick, The files you uploaded are for the 21000 series devices, which are 2 axis devices, versus the 21100 series devices which are 6+3 axis devices.  Although there are some similarities there are very significant differences.  Is…"
Mar 18

Developer
Doug Weibel commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"Does anybody have any actual experience with the Maxim21100?  I have a couple sample parts but thus far have not been able to get anything out of them.  Of course the data sheet doesn't help - it is missing all the register bitfield…"
Mar 18

Developer
Doug Weibel commented on Paul's blog post Soon we can mint our own carbon prop ? frame ?
"Hi Robert, Seems like that is just a programming issue to me.  Why can't it lay one layer down pulling the fiber left/right and the next layer pulling the fiber front/back?  I think weave is mostly just a convenience as you can handle…"
Jan 29

Developer
Doug Weibel commented on Thomas J Coyle III's blog post The Sparkfun 2014 AVC has been announced!
"OK Robert, I'll be twisting Peter's arm to come up with something for the plane course that will take at least an hour, maybe 2 hours - 30 or 40 laps of the reservoir perhaps? :)  Then we will see…  I'll start…"
Nov 20, 2013
Dan Doberstein commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"from above , Dougs comment "- conceptually Doppler measurements and carrier phase change measurements are the same, but the way they are made in a gps receiver is very different." I am not an expert in the measurement of doppler in GPS…"
Oct 3, 2013

Moderator
John Church commented on Doug Weibel's blog post Lemon-RX UART and PPM output
"I'm looking for an 8+ ch DSM Rx with PPM output. However, if APM/Pixhawk will support UART control, the model listed above is an option. Any word on whether such a decoder will be present in a future firmware release? Being that Pixhawk…"
Sep 4, 2013
Sam Corpe commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Hi Doug, I'm building my own DGPS system for use within my Masters project and was wondering if you would be able to help me by taking a look at what I've done so far. Im wanting to get sub meter accuracy and using the U-blox NEO-6P chip…"
Aug 20, 2013

Profile Information

About Me:
Full scale plane and sailplane pilot
RC heli pilot
Ex-engineer, tinkerer

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Doug Weibel's Blog

Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.

Posted on December 2, 2012 at 5:30pm 31 Comments

 

When the ublox 6 series modules were released, I noted that the 6T and 6P modules provided access to the raw carrier phase measurements, and I started thinking about how to use this capability.  My connections through my university research appointment weren't strong enough to get ublox to sample a dev kit to me (they generally don't sample them at all).  Jordi and Chris from 3DRobotics.com were kind enough to use…

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Annual Public Service Announcement

Posted on October 19, 2012 at 4:28pm 1 Comment

It is that time of the year when for many of us the furnaces have been turned on for the coming winter and the indoor air is getting dry, so it must be time for my annual ESD Public Service Announcement.

 

What is ESD?  Electrostatic Discharge!  That little spark you sometimes get when you touch a…

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Lemon-RX UART and PPM output

Posted on October 19, 2012 at 4:17pm 5 Comments

I have had a Lemon-RX (previously known as Orange-RX) DSM2 6-Channel Receiver (PPM + UART)

sitting around for a bit, and finally got around to hooking it up to my logic analyzer and checking it out today.  I was interested in this RX as an inexpensive option if you need PPM output and run Spektrum/JR gear.  I knew from the spec sheet that the channel resolution on…

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Best Quads doing stuff video

Posted on March 21, 2012 at 10:00am 2 Comments

In response to Chris' post of the best AP video ever, I have this offering

Difficulty with using Ultrasonic Ranging (Sonar) for landing flare control.

Posted on January 29, 2012 at 1:30pm 51 Comments

A feature frequently requested is to add support to ArduPlane for using sonar to control the landing flare.The answer, unfortunately, is probably no.  Take a look at this graph I obtained yesterday...

This has been on my to-do list for ages as I have never gotten around to getting some real world…

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Comment Wall (14 comments)

At 8:57am on October 22, 2009, Greg Gibbons said…
Doug, please send your debugged IMU code, and let me know what to fix in Labview, I have 8.6 Pro Dev Suite. I noticed your in Longmont, I live in Windsor CO. We should get together and fly, I have been developing an autopilot and Ground control station for about 5 years.

Thanks
greggibbons@comcast.net
Greg Gibbons
At 4:08pm on October 22, 2009, automatik said…
Hi Doug,
I would like a copy of revised ArduIMU code. I'll add you as a friend here in order to send you my emaill addy....As for LabVIEW code, i think there was a mixup between Z and indicators (if memory serves me right) and I remember seeing one more thing...
At 8:13pm on October 22, 2009, Dan Wilson said…
Doug,

I would like to have a look at your IMU code.

Do your subtle changes greatly affect performance?

I have recently been flight testing the algorithm in my own application. With Jordis gains I noticed pitch estimate problems at full throttle due to what I assume was engine vibration affecting the accelerometers. I turned down the gains to about 30% what they were and it seems to have remedied the problem.

Dan
dan.wilson00@gmail.com
At 3:25pm on December 4, 2009,
T3
William Premerlani
said…
Hi Doug,

You asked:

"Hi Bill,

We (some of us in the ArduIMU community) are having a friendly disagreement over what positive acceleration means relative to a reference frame. I'm afraid none of us may know the correct convention. If you have an IMU sitting on your desk and you begin to move it in the positive X coordinate direction, while you are accelerating it is that a positive or negative acceleration from the IMU’s perspective?"

The short answer is that many accelerometers, such as the MMA7260 that I use in the UAV DevBoard, actually measure gravity MINUS acceleration. So, in the case that you cite, the acceleration is positive, so the accelerometer will give you a negative output.

Best regards,
Bill
At 4:18pm on December 7, 2009, Danilo Marques Figueiredo said…
Hi Doug,

Did your arduIMU works fine with your ardupilot?!
My project is walking and I'm thinking to replace the thermopiles with arduIMU, Is it complicated to do it?!

Regards,

Danilo.
At 10:52pm on December 7, 2009,
Admin
Gary Mortimer
said…
Hey Doug messaging is down so I shall have to try here, unfortunately there's lots of rip off's of the original Vtail, if its from the USA that's what it will be. There are flat spars in the original about 6mm wide that are placed in the slot that runs on the underside of the wing for that purpose, also the from of the fins also receive the same treatment thats to stop them flexing. For hinging simply use some UHUpor and run two beads of it on each surface wait for it to dry and then bring together. Works really well. Please don't hesitate to ask any more questions, although as I say most being sold in the USA are not from the designer sadly!! Hooray for China, actually another country in this case, but the less said!
At 7:56am on December 17, 2009, john bero said…
Yes, it has four flights on it. It was a challenge to keep it under 6#. Came in @ 6.01#.
The first flight was good, had issues with take-off due to the high location of the motor and poor angle of attack with the wing. Even with this it performed quite well. Have a video of first flight. It is a heavy plane for its size; however it is very stable after the two issues were taken on with a small amt. of tinkering. I think I want to build a larger one, but foam wing is the way to go, coroplast is just too heavy for anything larger than this.
At 8:24am on December 17, 2009, john bero said…
Wild-thing specs.
48” wing span
11” cord
1” ailerons
48” length overall
36” X .75” alum. Channel
5 servo’s (slave for steering)
Basswood saddle for servos
.125 OD music wire (landing gear)
2.25” wheels
Landing gear offset 1.5” for camera clearance
Monsterpower 32 out-runner kv 770
11 X 7 prop
14.8 lipo four cell
80 amp esc
6 channel receiver
2” gutter pipe
Walmart paint ball magazine (motor housing)
Soda straws
.5” poly urethane firewall (Wal-Mart cutting board)
Yellow monocoat.
Misc. nylon screws, nylon spacers, glue, Velcro, etc
At 6:29pm on March 11, 2010,
T3
William Premerlani
said…
Doug,
I am responding to your comment about putting a plane through a windshield. Its a bit off topic, so I am putting it here.
The guy who runs the local hobby shop in my town, Daryl, sold a plane to someone. Daryl drove out to the field on the day the customer took the plane up for its first flight.
Shortly after Daryl got there, the plane went out of control, busted through Daryl's windshield, and landed in the front seat of Daryl's car. Guess he lost money on that sale.
There is a picture of the plane, taken looking through the hole in the windshield, that is up in Daryl's shop, with the caption, "shit happens".
Daryl says there is no way to know for sure what happened, but his guess is that the crystal shook loose from the receiver.
Bill
At 8:26am on June 29, 2010, Dave Whittington said…
Doug,
A couple of things
1. I should be able to understand the code as necessary
2. I don't have ailerons - only rudder - but it turns very well as is
3. I only have a DX6i transmitter, so I will only be able to test MANUAL/other mode - one at a time.
4. I do have a gumstick video camera to record the flight along with the flash log
5. I will take my laptop along as necessary to download various versions - but I can't run the ground station as I didn't get telemetry hardware.
6. I will probably fly out slightly over the ocean - see http://vimeo.com/10569804 - but how close can my waypoints be for a figure eight ( I want to keep it in tight and over the beach).
Dave Whittington

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