All Posts (14056)

Sort by

Something new is coming...



Do you want to find out what this is all about?
If you do, you should listen to the podcast this Sunday night for all the details.
For now, a few features of this mystery device pictured above;


  • Open Source Software & Hardware
  • STM32 Microcontroller (32bit, 72MHz, 90MIPS)
  • MicroSD Card for datalogging, setting and flight plan storage
  • USB 2.0 Full Speed support
  • Barometer intergrated on-board
  • 8 Servo Outputs
  • 8 RC Inputs
  • 3 Serial Ports
  • 6 ADC Analog to Digital Inputs
  • I2C, CAN and SPI Communication Interfaces
  • JTAG Debugging Interface connector

See you then!
Read more…
Moderator

It would seem silly to re invent it

telemeter-4(2).jpg


The Quanum telemetry system gives real-time, accurate voltage display and low voltage warnings via a robust 2.4Ghz DSSS connection.
The receiver pannel is a large 132x64 LCD and attaches directly to your existing radios antenna for convenient at-a-glance in-flight voltage checks.
The Quanum Telemetry system will also warn you when your battery pack is approaching 3v per cell with a variable audio tone. No more deadstick landings!
And because its 2.4Ghz DSSS it wont interfere with your existing system, no matter what channel youre on!
The Quanum Telemetry system transmits a narrow, lightweight signal 4 times a second and uses DSSS technology to ensure no conflicts with other systems close by. Included is an inbuilt 450mAh Li-ion power source and a convenient in-car and PC USB charge jack!
Specification;
Tx Weight: 16g
Tx Size: 50x17.5mm
Tx Output: 20dBm <100mW 2.4Ghz DSSS
FCC ID: XR9V003
Included;
Large high contrast 132x64 pixel LCD 2.4Ghz Receiver.
1km Range 1~6S Transmitter
Receiver mount (universal type)
Cigarette lighter 5v out USB charger
USB cable. (Charge in car or on a PC)
CE, FCC, RoHS

http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=10343&Product_Name=Quanum_2.4Ghz_voltage_telemetry_(1km_Range


I wonder if this could be hacked to tell us a little more on the ground, not in colour or hi-res obviously


Signs of things to come. Just thinking its probably useful in itself as a backup battery monitor on the ground.

Read more…

Hammering on the Marcy 1 radio problem

The radios have plenty of range in the apartment 12ft off the ground. Put the receiver on the ground & it dies. Put the receiver on a tripod & its range slightly improves. Hold the receiver in your hand & it dies. It's as if the antennas are
getting shunted to the ground. Xbees are shielded but Marcy 1's aren't. In any case, range is far less than 72Mhz. Frequency doesn't matter.

After trying many antennas, the receiver antenna doesn't matter. It works without an antenna. The transmitter antenna is required. The best one has been a loop with no balun. Dipoles are 2nd. Monopoles with the balun suck. Unless you've got an amplifier, skip the monopole.








Loop antennas got us a big improvement but still not the same range as the 1st 2 boards.

The double sided board for telemetry goesmuch farther than the single sided board for RC so maybe double sided boards were the key.










Fuggedaboutit. That actually degraded performance. Next tried isolating the transmitter from the remote control.



That didn't do any good either. It's coming down to silicon defects.

So when you get the radios optimized, what happens but CPU overloading when all systems are running. The problem is fixed packet sizes of 100 bytes take too many clockcycles on the ground station so you really need variable packet sizes as shown in the MRF49XA reference software.

In any case, just think how radios once required huge coils & half a circuit board like your 72Mhz remote control. Never thought we'd solder chip radios on our own boards.


1 day with better radio performance got us the 1st autonomous flight out of Marcy 1. Not much of an autonomous flight but no-one ever documented an autonomous monocopter before.

You really can't get much done when working 50 hours/week & sitting in traffic another 10. No surprise Parrot Cellular whipped out WiFiquad rotors with a full time staff while you were still warming yourboss's seat.



Read more…
Developer


New download firmware has just been added to the repository http://code.google.com/p/ardu-imu/downloads/list


The v1.5 firmware includes:

  • ADC oversampling which increases the effective resolution of the gyros and accelerometers
  • Drift correction gain de-weighting and speed filtering
  • Support for binary output messages as well as human readable
  • Support for both hardware types
  • Ground and Air start modes
  • Other improvements and bug fixes
I would like to give praise to Jose Julio for his excellent work on the first two items. I would also like to give Andrew Matthews an award! - "The Big Juicy Bug Squashing Award" for finding a very difficult to find bug in the gps parser. That crazy bug would cause ArduIMU to crash, but only after several hours. Not easy to find a bug when you have to watch all night to see it once.

The binary output messages and air start modes have been added to support use of Ardu_IMU with ArduPilot. Complementary ArduPilot firmware will be coming soon. Interested alpha testers can PM me.

The Labview viewer software is still messed up. If someone with Labview would like to fix it please let me know and I'll tell you what needs to be done.
Read more…

FC-420 2.5gr Submicro for Ultralight UAV's

Hi Everyone,

I just released my new FC-420 camera.
This camera working with 3.6-5.5V and supporting 1 cell LithiumPolymer batteries as my FTX-10 video Transmitter

54-194-thickbox.jpg




Specifications




Resolution

510×492(NTSC)

Horizontal Resolution

420 TV Lines


View angle

60 degree

Minimum illumination

0.05lux.

Operating voltage

DC: 3.6-5.5V


Operating current

50MA

Video input voltage:75R

1.0Vp-p

Dimensions( L X W X H)

17mm X17mm X 10.5mm

Weight


2.45g


Connections :


PIN 1


Vcc(DC3.6-5.5V)

PIN 2

Ground

PIN 3

Video


Product details here: http://www.flytron.com/54-fc-420-25gr-submicro-fpv-camera.html


Read more…
T3

AXN Floater Buildup

I'm slowly getting some web pages put up to document the PICPilot development. Since I had just built up another AXN Floater Easy Star clone I thought I would start with that for those considering it as a possible UAV platform. Take a look here if your interested:

http://www.desert-wolfe.com/PICPilot/AXN_Floater_Prt1.html

I'll be adding more content as time allows.

Brian
Read more…
Moderator

Liverpool police make first UK UAS arrest


merseyside-police-drone-300-688949247.jpg


MERSEYSIDE police made the first ever arrest in the UK using a flying drone to catch a suspected car thief in thick fog.

It swooped into action in Litherland to find a suspect who was hiding at night in poor visibility.

The unmanned aerial vehicle (UAV) acts as a flying CCTV and thermal imaging camera.

It was deployed on January 26 when it was reported that two men had stolen a Renault Clio in Bootle.

After a police car chase the suspects bailed out of the Clio.

Officers were able to detain one of the suspects, but struggled to find the second man in the dark.

But using the UAV's onboard thermal imaging technology, its operator was able to use live images of the suspect’s body-heat to direct patrols to the spot by the canal where he was lying.

The force became the first in the UK to trial the drones in 2007, and since then has used them to assist in search and rescue operations, search warrants and to crack down on anti-social behaviour.

They are operated by the force’s anti-social behaviour task force and directed from the ground by remote control, providing the force with a cheaper alternative to the police helicopter when aerial surveillance is needed.

http://www.liverpoolecho.co.uk/liverpool-news/local-news/2010/02/11/merseyside-police-make-uk-s-first-ever-flying-drone-arrest-in-litherland-100252-25810555/


Read more…
Admin
Hi all,
I have been looking for potential high wing nitro/gas powered pusher model for using as test UAV.

5_skyarrow3.jpg


The basic criteria are
1. Pusher preferably powered by .46 - 0.91 nitro or 15 -20 cc gas powered
2. Enough payload space and possible nose space for cam mount that could be retracted.
3. small enough to be portable in a small car
4 , 2 pc wing
5. Single tail boom
6. Fiber glass fus if possible
7. Cheap of course
etc etc
Here is a model I found called Sky arrow , feel free to comment and point to any other similar model. I am also looking for source of this model called Super Drifter posted by Member ( Rana) supposedly made in Germany but I found it also being used in Japan by aerial photography company with some HD camera. I would appreciate if some one can point me to link for source of this Super Drifter/teddy bear plane ( video here ) model aeroplane

Sky Arrow specs
Wing span: 1600 mm / 63 in
Fuselage length: 1300 mm / 51 in
Flying weight: 2300 g / 5 lbs
Wing area : 566 sq in / 36.5 sq.dm

Additional Requirements:
Engine Required: 2c 0.46 cu in
Radio Required: 4channels ; 6 Servos

Top quality wood construction with fiberglass fuselage
Comes with all hardware and accessories

5_skyarrow3.jpg


4_1230267232.jpg



Read more…

9.2 inches tip to tip. Will it fly??!!





Rotors pitched to induce nose-up pitch and counter-clockwise yaw


I am beginning to think that this is do-able. it looks very heavy, and i need to do the math to figure out how much thrust I can get out of my brushed motors. I reduced rotor diameter, added a horizontal stab, and added a canopy so it looks more fly-able.


The fun part is almost over, as I need to start diving into the math to make sure this will fly.

Read more…
3D Robotics

National Robotics Week

3689340073?profile=original

From RobotLiving:

"Coming April 10 – 18 is the first National Robotics Week in the US. It is being launched by an alliance various academic and non profit organizations.

Look for events in your area. Shown below are only some the exciting events coming in April.

Boston, Mass.

  • New England Botball Regional Tournament and New England Botfest, University of Massachusetts Lowell, April 10
  • Robot Block Party, Museum of Science, April 17

Pittsburgh, Pa.

  • Carnegie Mellon University Robotics Institute 30th Anniversary Open House
  • Announcement of the Class of 2010 Robotics Hall of Fame Inductees
  • Carnegie Science Center Café Scientifique Event

San Francisco, Calif.

  • Young Innovators Day, The Tech Museum in Silicon Valley, April 11"
  • Robot Block Party, Stanford University, April 14
  • Robots in Action, Adept Technology, April 16
Read more…

Transverse Rotor UAV: Articulating Arm CONCEPT


This is a lunchtime sketch: will make this quick.

Two independent brushed (thinking weight and cost here) motors directly drive counter-rotating rotors.

I used 4x Blue Arrow S0251 micro servos as a template only, for this concept, to drive the articulating rotors for pitch and yaw control.

Cons to this idea? Row will be controlled by variable motor speed control--I wonder if spinning up one motor to roll the craft will cause undesired gyroscopic affects (hence my first concept using bell-hiller). Two motors also will double probability of motor failure mid-flight. I need to use beefier servos for this design, which will add weight and draw more amps.

Pros: less moving parts, simpler and possibly stronger design.

hmm. This concept is 11" wide rotor tip to rotor tip.


Read more…
Developer

Position & Wind Extended Kalman

Wrote up a wind estimator today. It is based off of a simple model which requires very little inputs from sensors.

psi - true heading (not course over ground)

theta - pitch

airspeed

GPS lat and long

It is a simple model. The wind model has no dynamics which helps simplify the solution. This asusmption is mostly true beings the wind direction and velocity doesn't change all that much for a given flight. The filter starts off by assuming the soltion is a zero wind scenario and then moves towards reality. It takes about 2-3 seconds to converge.

The non-linear state update equations are as follows:

Pn_dot = Vair*cos(psi)*cos(theta) - Wn

Pe_dot = Vair*sin(psi)*cos(theta) - We

Wn_dot = 0

We_dot = 0

Notice the filter resolves on a wind velocity of 15 ft/s and 090 deg heading.

Pretty slick how quickly it finds a solution.

Read more…

Burglars use toy chopper to steal

From News24:

Burglars use toy chopper to steal

2010-02-07 19:33

Taipei - Taiwan police have arrested two men accused of using a toy helicopter to search homes before burgling them, a newspaper reported on Sunday.

Taipei police arrested Chang Chen-cheng and seized the model aircraft, plus stolen goods, at his home, and are searching for his partner in crime Ah Hsiang.

The pair have allegedly committed a dozen burglaries using the toy helicopter, the Apple Daily said.

According to police, Chang and Ah Hsiang would ride motorbikes in North Taiwan to search for suitable victims, then release the toy radio-controlled helicopter.

The helicopter would fly to the window of an apartment, take photos of the inside of the apartment, and send the images to a computer inside the car.

If the photos revealed there was no one in the apartment, Chang and Ah Hsiang would allegedly break in and carry out the burglary, the Apple Daily said.

The helicopter was powered by a battery and measured 21cm and could remain airborne for 12 minutes - with little noise.

- SAPA

Read more…