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The BIG Skywalker FPV UAV platform


Skywalker is now in a new version made of EPO foam. Much stronger foam.

Length: 1180mm
Wingspan: 1680mm
Wing Area¡G35.5dm2
Wing Loading¡G36.6

Recommendation
4 x 9g Servo
3S1P 11.1V 2200mAH-5000mAH
Motor: 2215-1200KV or 2815-900KV
Propeller: APC-9045E 9060E

I think this platform could be the replacement for the smaller Easystar if it's possible. What do you think?

Skywalker is now in stock! This is not the EPS foam, this is the new EPO version - much stronger foam.

wing.jpg

See more on this Skywalker FPV UAV platform.

skywalker.jpg

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3D Robotics

RC helicopters collecting whale snot

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We're always looking for practical applications of what we do. Here's one from from Makezine:

"As you folks know--all too well, I'm sure--it is extremely difficult to collect blood from a wild whale without injuring or killing it in the process. However, and as even a child can tell you, the next best thing to live whale blood is live whale snot. Turns out it spews from their blowholes when they exhale, so the process is really very simple:

  1. Find whale.
  2. Hold petri dish over blowhole to intercept spout.
  3. Return to lab, enjoy sample.

Step 2 is actually the hard part. And although your first instinct may be to just jump in your rowboat, paddle out to a whale pod, lean way out over the side with your sample container, and wait, that's actually not as safe as it might sound. Each year, untold millions of scientists die attempting this maneuver. Their sun-bleached bones litter beaches all along the Pacific coast.

Enter Dr. Karina Acevedo-Whitehouse, of the Zoological Society of London. Her recent paper in Animal Conservation(abstract), irresistibly entitled "A novel non-invasive tool for disease surveillance of free-ranging whales and its relevance to conservation programs," introduces the ground-breaking methodology of strapping a petri dish to a toy RC helicopter and flying it into the spout. This landmark work stands not only to revolutionize our understanding of whale disease, but to save countless lives, and establishes Dr. Acevedo-Whitehouse as a serious contender for this year's (Ig) Nobel "Prize."

[via The Thoughtful Animal]

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NOISE NOISE NOISE

Marcy 1's flight time is horrible with POV. It's declined from 10 to 6 minutes.

She's got radio lockups with the chip radios. That's coming down to a hardware state which can't be corrected by resetting the hardware. Connecting reset to Vdd reduces the lockups but adds a huge amount of noise to the thermopile readout. The logic pins on the MRF49XA put a huge amount of noise into your power supply.

The thermopile is down to power line noise. This isn't a problem when they're used in pairs because the noise cancels out on each thermopile. A single high gain therompile on Marcy 1 is like mounting a telescope on a piston engine.

Run it on its own battery & you get an extremely clean signal with body heat sensitivity. On the main battery, it's noise. The only filter that works is a huge capacitor, resistor & inductor. The Vdd wire has to be separated from the output wire. A capacitor or inductor alone doesn't work.







Got it really quiet, but when the motor came on it was noise again.



Next came a coin cell with a MOSFET to switch it off when the main battery was disconnected. That got super quiet without inductors, but as soon as the motor started it was all over.



Managed to get it a little quieter by separating it from the motor. The thermopile pulled the coin cell down to 2.8V. The MOSFET leaked too much current in the off state. The coin cell + holder was heavier than an inductor.

The next step is using the highpass filter with a pair, but since Marcy 1 has no symmetric mounting point, 1 pile would be a noise reference pointing at the ground or something.



Well, we did manage to get a hello out of Major Marcy in real life. Not much, but with so many men hounding Her there wasn't much dialog to be had. Was not comfortable mentioning our hobby around Her & Her lover said She worked WITH the Air Force. He may not have known Her as well as us or She may not have revealed Her warriorness.




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New on DIY Drones

Hi,
Congratulations for your community!
I am new here. Let me introduce myself. I am from Brazil, i live in Rio de Janeiro and I study Computer Engineering.
I am interested in IMU, sensors, GPS and all about UAV.
I am studying Premerlani UAV Dev. Board, all the material and the DCM Theory. I expect that soon I will be able to contruibute to the development of this great project!




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Developer


No ground crew today. Down view camera was installed.
Front camera view of todays flight testing of PID settings for throttle cruise 80 & throttle max 120, pitch compensation .30 Test battery a 2250mAh 3s lipo had 1 cell going bad,

I replaced battery and retested, but crashed flat and hard when I panicked and set Mode to FBW instead of Manual..
Systems damage report:
Power train,
APC 7x4 EP prop broken off both sides, replace with APC Gas 7x3 $1.95
Motor mount ripped off, $2 flexable superglue and carbon fiber, New mount for contest $5
2250 mAh test battery has one bad cell now, $60 new 4s 2650mAh 40c for contest

Structural,
starboard side,
Tears in foam on both sides of vertical fin up to spars, $1 Liquid Nails or lo temp hot glue.
New foam body $21 for contest.
Control horn ripped off, but still on wire z bend, $0.50 superglue and add some carbon fiber.
Stripped servo plastic gears, replace set $2.49
All other electronics are fine.

Made several test flights, my observations:
1. Don't flight test with a weak or old battery
2. make smaller PID p changes, over correcting in pitch and over powered throttle in FBW mode
3. Start FWB mode at about 150' when testing throttle or pitch PID changes, 50' higher than normal
4. Train left hand Learn to use Mode switch when panic ensues, place in Manual vs FBW and relax
5. Don't ground test with a weak or old battery
6. Flying in snow is fun!
7. Don't panic!
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Moderator

Boeing launches 3D camera

From a Boeing press release http://boeing.mediaroom.com/index.php?s=43&item=1107

photon_3D_camera_th.jpg


ALBUQUERQUE, N.M., March 8, 2010 -- The Boeing Company [NYSE: BA] today announced it has begun offering a new, compact, energy-efficient camera that provides three-dimensional images for military and commercial applications.

Boeing Directed Energy Systems and wholly owned Boeing subsidiary Spectrolab have jointly developed the camera using their own research and development funding, and successfully tested it over the past two years by attaching it to mobile ground platforms and a Boeing AH-6 Little Bird helicopter. Equipped with advanced sensors that were developed by the Massachusetts Institute of Technology's Lincoln Laboratory and transferred to Boeing under a teaming arrangement, the cube-shaped camera is one-third the size and uses one-tenth the power of most comparable 3-D imaging cameras.

"Our three-dimensional camera fits a lot of capability into a small package," said Nasser Karam, vice president of Advanced Technology Products at Spectrolab. "Its compact design and modest power needs will allow it to be deployed on a wide range of platforms, including unmanned aerial and ground vehicles that don't have much room or power to spare."

The camera, which Boeing can customize for each customer, has many potential uses, including mapping terrain, tracking targets and seeing through foliage. To create a 3-D image, the camera fires a short pulse of laser light, then measures the pulse's flight time to determine how far away each part of the camera's field of view is.

"The camera combines cutting-edge sensor technology with Boeing's advanced pointing and tracking solutions and real-time processing to provide our customers with highly integrated 3-D imaging payloads for ground, airborne or space-based applications," said Joseph Paranto, Growth lead for Directed Energy Systems in Albuquerque.

Boeing is currently integrating the camera into compact 3-D imaging payloads on unmanned aerial vehicles and will be testing that capability this spring. The team will also add 3-D video capability to the camera soon to complement its existing still-image capability.

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3D Robotics

Famous ABE lost at sea

A sad day for our underwater cousins:


"The ABE (Autonomous Benthic Explorer) has used its on-board acoustic transponders and five thrusters to scan the seafloor for over 15 years - locating, mapping, and photographing hydrothermal vents, volcanoes, and other features of the great deep. Marked with "NCC1701" due to its resemblance to Captain Kirk's ship, ABE has performed more than 200 missions collecting valuable data for researchers worldwide. But something went wrong last Friday on an expedition off the coast of Chile and ABE just stopped - nothing was ever heard again. No word yet on whether ABE can be located or recovered."
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T3

Testing the new ArduIMU Viewer with FLEXIPILOT from Krzysztof Bosak on Vimeo.

Unfortunately ArduIMU Viewer is not accepting the protocol that ArduStation likes.The demonstration shows the look of both viewers,where to click on order to configure COM port and alsohow to setup the protocol with FLEXIPILOT.Observe a bug in the viewer making possible multiple creation of 3D cube.
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I am designing (and may soon produce) a 4 channel electronic speed controller (ESC) for brushless RC motors.

The Problem
It seems as though everybody who builds a quadcopter uses 4 individual PWM ESC's (that are often zip-tied to the rotor arms).
http://ng.uavp.ch/moin/UserCopters
http://quadcopter.wordpress.com/
http://scsuquadcopter2010.blogspot.com/
http://t413.com/news/category/quadcopter
http://vrhome.net/vassilis/2009/01/q...bly-completed/
etc...

Overall it's a bit messy and there are wires and small PCB's everywhere. Some people also convert their ESC's to receive I2C commands instead of PWM since it's faster and easier to pair with their flight controller.

The Solution
This is a 4 channel motor controller based on Atmel AVR's that can be controlled using serial, I2C, or even a standard PWM input. This is a single circuit board with 4 sets of 3-phase motor outputs. Each of the four segments on the board can power up to a 30A motor (so 120A max for the entire board). Each of the four segments is controlled INDIVIDUALLY (required for quadcopters).

In addition, the board can act as a master power management board for any other boards you hook into it. Your battery will plug into this controller (think Dean's connectors), and there will be regulated 3.3v and 5v outputs that can be used to power your flight controller or other circuit boards on your aircraft.

Possible Uses
Quadcopters! That's what this is designed for. That being said, this would work on practically any model that uses more than one brushless motor (4 motor electric planes maybe?).

Form Factor (roughly 4" square)
The board is designed to be a part of a low-height modular stacking system that I'm using for my quadcopter. I'm also developing an AVR-based flight controller (with full IMU) that can stack on top of this, as well as other add-on boards. There is a common communication bus between all boards stacked together. I can share more about this if anyone is interested (in either the modular form factor or the AVR-based flight controller board). The size of the board was made to fit the custom centerplates I'm having cut for my quadcopter.

Features
- 4 individual brushless motor controller channels on a single circuit board.
- Very fast update rate (using 20Mhz AVRs so there's a lot of room to spare!)
- Up to 30A per motor.
- Uses Atmel AVR's, so you can reprogram it as much as you like.
- Current limiting/feedback per motor (automatically reduces throttle if a particular motor exceeds the maximum current you've set - doesn't just shut the motor off like other ESC's).
- All surface mount components.
- Open source!
- Low-profile board (most likely less than 7mm thick).
- Serial/I2C digital communication/control.

Availability
I am only gauging interest at this point in order to determine if I should make extra boards to sell. If there is interest, I'll have extra PCB's made and assembled for anybody that wants one. I'm expecting to be able to sell them for around $120.00.

Are any of you interested?
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Hi Everyone,

I just released new Open Source software for CompuFly USBtoPPM Interface,

compufly_software_1_0_s.png
This Software supporting all flight joysticks like Saitek ST290,

Software includes:
  • 7 channel control by joystick
  • Camera Pan/Tilt with HAD stricks and auto centering with one button press
  • Rudder control from joystick
  • Trottle control from joystick
  • Landing gear or any remote switch On/Off with buttonsixes
  • Trim/Reverse and EPA mixes from software
  • 1024 step servo position for each channels
  • Positive and Negative PPM selection
  • Channel output selection 1 to 10 channels
  • Futaba Square/Round, Hitec Round, ESky, 3.5mm Jack type Plugs Available


Software under GNU license, all developers welcome.


Product Link: http://www.flytron.com/56-compufly-u...converter.html
Download link: http://www.flytron.com/pdf/CompuFly.zip
USB Driver Link: http://www.flytron.com/pdf/CP210x_VC...K3_Vista_7.zip

56-205-large.jpg


Thanks for reading
Melih Karakelle
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The AeroQuad


I know this is not strictly a UAV but because this is centre of the universe for things Arduino flight related and there have been some very cool posts about Quads lately (it is also one of my passions), I thought I would post about an Open Source Arduino based Quad platform in case people are not aware of it.

I have heard of the project in the past but never really spent any decent time looking at it until today, it certainly looks very good and appears to fly very well. The website is http://aeroquad.info and it uses either the Arduino Duemilanove w/ Atmega 328 or the Arduino Mega.

One of the other reasons for posting this is I wonder how easy it would be to get the code to run on the upcoming ArduPilot Mega and utilising the ArduIMU?

The parts list, source code and loads of good information are on the site. Looks to be a very well run project.

UPDATE: Sorry, this has been posted before, however, I am very interested in the question of running this code on the upcoming ArduPilot Mega and using the ArduIMU as sensor inputs.

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Developer

ArduPilot_251 flight test with AP Throttle control from Mark Colwell on Vimeo.


ArduPilot 251, ArduIMUv1, Shieldv1, uBlox, Elevon mixing on a Stryker II with onboard video and HD ground video, sorry no telemetry. Winds 10-15 with some gusts to 20mph. Tip stall due to low throttle center speed setting and maneuvering in Fly-By-Wire mode. Next flight I climbed to safe altitude then landed in Stabilize mode with throttle cut off. Landing was smooth in gusty conditions! Next time testing with latest rev and more power for a longer flight, maybe fly to to some waypoints too...

ArduPilot 251 test flight with AP Throttle control HD ground video from Mark Colwell on Vimeo.



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3D Robotics

Spam fighting on DIY Drones

If we do our job right, most members here will have no idea how much spam we fight here every day. Normally it's not too much, just a dozen members who have spam links in their profile. But over the last week, DIY Drones, like most of the other networks hosted on the Ning platform, has been hit by the biggest botnet attack we've ever seen, with hundreds of fake member accounts being created every day to post Canadian pharmaceutical ads. The graph above, from this article, shows the rise of these botnet attacks in recent weeks.

The reason members shouldn't know anything about this is because of the heroic work of your 30 administrators and moderators, who have been manually banning these accounts and deleting the posts before they're published (that's why we moderate all posts). The posts can come at the rate of dozens per hour, so this is a big job; I just wanted to publicly thank the moderators, especially Morli and Thomas Coyle for their tireless work in fending off these bots.

Just to give you and idea of what they're dealing with, here is about 30 minute's worth of banned members from today (don't worry; I'm not invading anyone's privacy--those are all bots):



The good news is that Ning is putting in place measures to stop this. Every time we ban a member for spam, that information is propagated throughout the Ning system (they have more than a million network like DIY Drones) and if an account is banned on one network, it will be banned on all of them. But we're up against a botnet of millions of zombie PCs, so sometimes the bad guys get ahead.

Ning just posted the new tactics it will be putting in place to turn the tide: "We have the initial captcha for first time posters now and will be adding a temporary suspension too." Hopefully, this will start to take effect soon and our moderators can take a break. Until then, a huge thanks!
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T3

Testing FLEXIPILOT single gyro and ArduIMU V2 viewer from Krzysztof Bosak on Vimeo.


The biggest problem: yaw angle is displayed incorrectly:
either emitting 0...360 deg or -180...180 deg got strange jump.

Accel Yaw: there could be only AccelZ,

calculating any kind of yaw

with accelerometers makes no sense.
may I suggest also renaming AccelPitch to AccelY
and AccelRoll to AccelX.

The units of Acceleration display are strange,
normally the Gs are +/-10 max.

10 points for very high update rate :-)


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