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Hi all,

in the subject of mapping from the air, it is important to know how many pixels fall per cm on the ground.

Following

http://en.wikipedia.org/wiki/Angle_of_view

425px-Angle_of_view.svg.png

we got the following angles of view from equivalent focal length and we can compute aspect ratio from them:

 

Focal Length (mm)24283543.350
Vertical (°)53.146.437.83127
Horizontal (°)73.765.554.445.139.6

1.387947271.411637931.439153441.454838711.46666667

 

On the other hand you have sensor resolution:

Canon S90 is  3648 x 2736 = 9980928 roughly 10MPIX

this is aspect ratio 3648/2736=1.333...

It is said to be equivalent to focal length 28...105mm.

 

On the other hand all aspect ratios calculated above are well above 1.33.

 

Conclusion: even standard lens are generating wider view than the sensor is,

resulting in less horisontal than vertical resolution.

True or false?

 

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Copter-GCS: Android ground station for ArduCopter

GPSSample.png?width=420Hello all,

After some field testing, i'm finally ready to release a copy of the Android based, bluetooth GCS for ArduCopter into the wild.

For all the details go to the site.

Its available in 3 ways:

  • Install from Android Market ($5, largely to offset publishing costs/support development) Copter-GCS
  • Install the APK from the download section (Free)
  • Build from source, following these instuctions.

The reason for the market version is for those who would like to just install in the easiest way possible / receive automatic updates or would like to support development costs (thanks you) such as the fee required to publish on the market.

connected.png?width=200gpsModeStatus.png?width=200offsets.png?width=200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Current features:

  • GPS plotting of phone and GPS, quad path rendering and logging of the track to the SD card.
  • Sensor graphing
  • Status display, such as current mode and GPS state
  • Setup
    • PID Tuning
    • Accelerometer Offsets, both traditional and using the drift direction
    • Transmitter Calibration

Let me know how it works for those that try :)

Bart.

 

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On Screen Display with GPS

HKGOSD.jpgThis new OSD was listed on the Hobbyking website today. The HobbyKing G-OSD unit is a quick and easy way to add GPS on screen information to your FPV system. With GPS Coordinates, airspeed, voltmeter and many more display functions this OSD unit will make a great addition to any FPV setup at a fraction of the cost of other GPS OSD systems currently available.

Features:
GPS coordinate display, time display, airspeed display
voltmeter and stopwatch
RSSI receiver signal strength detection
Programmable display content
Supports NTSC and PAL TV signal
Supports anti-glare shade control signal
Supports manual calibration

Specifications:
Weight: main board 4.6g / GPS module 22g
Size: main board 34mmx20mmx4mm / GPS Module 35mmx35mmx5mm
Working Voltage: G-OSD 7.4V-12V / GPS Module 5V

 

Price is US$ 37.51 (depending on you Hobbyking membership level, it can be lower). More information on the product page

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AC2 First Real Test Flight & Crash

 

After being stuck dead in the water for 6 wks waiting for a new Tx.... Today was the day to do some real testing.  The weather was almost perfect, little gusty but not to bad.  I did some rough PID tuning in the garage late last night, and soldered the 3 Gyro pads.  It still wants to drift and the YAW might just need some PID-Tuning to get it acting right.  The front Left motor with all the vibration must be replaced.  I can really tell in the video that the copter is fighting with it as well as the gustyness and the YAW + Drift.  Right before the Crash I had almost full forward stick but nothing was happening.  Then soon as I let off the stick it freaked out.  The Quad frame worked out as intended. Protected the electronics from hard landing / crash.  I would rather destroy the chassi than the electronic's.  So now time for new motors, and a stronger frame. 

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How to Chat on DIY_Drones

How to Chat on DIY-Drones.

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1.)  Click on " My Page"

2.)  look @ Bottom right corner of the screen.  Kinda works like FaceBook Chat.

 

Every day I find fellow DIY-Droners that have no clue that there is live " Chat "  they can use to help others or get help from others.

 

Happy Chatting

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Developer

New! APM Planner 1.0

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Over the past couple of weeks I have been busy reworking my original APM Mission Planner. Together with my partner/designer Samantha Nelson we have focused on improving the APM Planner’s interface, ideally resulting in a more intuitive user experience.   

Below are a couple screenshots of the new APM Planner!

 

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APM Planner Version 1.0.0 can be downloaded here -


https://code.google.com/p/ardupilot-mega/downloads/list

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Fun with an helicopter autopilot.

 

I've setup my helicopter (Trex 600 with self written autopilot ) so I could position it via RC then tell it to freeze in place.

Today I had fun with that out at the Friends of Amateur rocketry site.

 

Its been a long 20 hour day and I'm tired. I have to catch a plane in the morning so I won't get a chance to do this later.

I'm uploading the view from the helicopter.It should be on my youtube channel in about an hour.

Please note in the video the windsock in the background and the stability of the helicopter .

 

 

 

 

 

 

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VTOL unmaned mobile battery swapper

A DIY DRONES inspired project
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           The project officialy start after my first 8 months with DIY DRONES.         

            The chalenge is to design a integrated mechanic, electronic and communication system

           The project development axes are:

                                    1- VTOL on board Battery Swapper System

                                                    

                        2- Landing Deck  Battery Swapper system

 

                        3- UGV deck mobility system Rover/Crawler


                                    I will soon start publishing pictures of the work done at this point of time

                                                                                                                         ____________________

                                                                                                                                Bernard Michaud

                                                                                      

 

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3D Robotics

DIY Drones visit to Scaled Composites

3689411256?profile=originalThis week, some of the 3D Robotics engineers and I visited Scaled Composites in Mojave, about an hour and half east of Los Angeles, to demo ArduCopter, get a tour of the facilities and talk about the DIY Drones community-driven innovation model with the Scaled engineers. Scaled is famous for being founded by the legendary Burt Rutan (who retired this year), winning the X-Prize for the first civilian mission to space, and for designing SpaceShip Two and its launch aircraft WhiteKnight Two (both shown above), which will be the aircraft used by Virgin Galactic to start the first regularly scheduled space tourism business in a few years.  It is total geek nirvana and the closest thing to the Right Stuff still in operation.

 

We weren't allowed to take pictures for most of our tour and meetings (we got to see EVERYTHING, including watching the Virgin Galactic pilots train on the awesome room-sized Spaceship Two simulator and poking our heads into Spaceship Two and Whiteknight Two), but here are a few shots we could take:

 

3689411156?profile=originalWhen you approach the Scaled facilities, the first thing you see is the Rotary Rocket, which it made about a decade ago and flew once before funding issues killed the project.

3689411227?profile=originalHere it is up close. Hard to imagine that two pilots sat in that cockpit while it flew. Brave...

 

3689411177?profile=originalGigio Romero (UDrones), Sam Kelly and Jeff Taylor from the 3D Robotics team.

 

3689411302?profile=originalBack in the 1990s, Scaled designed one of their first UAVs, the Raptor. They're mostly a manned aircraft company, so they made it "manned optional".  That meant having the pilot sit outside! Below is a photo of that seat in storage today. Note the stirrups--they had to tie the pilot's feet to the fuselage so the wind didn't blow them out of the straps!

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This was a crazy design by one engineer back in the day trying to prove that you didn't need high aspect-ratio wings (long thin ones, like a glider) for efficient flight. He survived, but his theory didn't.

 

3689411312?profile=originalThis is a personal project underway by one of the engineers. It's an electric airplane that is designed to set distance and endurance records for manned electric flight. It uses a brushed electric motor (we weren't allowed to photograph it, but it was no larger than a dinner plate) that only generates 20 horsepower. But this design is so efficient, that's enough. BTW, they use a brushed rather than brushless motor because its failure mode is more gentle. As we all know, if something goes wrong with one of the brushless motor wires or the ESC, it's game over--it can destroy itself in seconds. There are fewer things that can wrong with a brushed motor.

 

3689411354?profile=originalI gave a speech about DIY Drones and open innovation models to some of the engineers. Then Gigio did an indoor demo of ArduCopter.

 

3689411428?profile=originalNot a lot of room to fly in there...don't hit the cruise missile!

 

3689411328?profile=originalThen it was time for an outdoors demo. The wind was blowing at 28 knots (32 miles per hour)!!! Here, Jeff is setting up the ground station.

 

3689411368?profile=originalArduCopter handled the wind pretty well! But eventually when we put it Loiter mode at higher altitude a crazy gust blew it out of the flight area and Gigio had to take over manual control. Unfortunately it was too far away to see the orientation (sadly he wasn't flying in Simple Mode, which would have made that unnecessary), so he had to put it down in a neighboring field. Copter retrieved, safe and sound!

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Moderator

This video is the result of my last test :

In the test i'm using :

n my development i'm using :

Multipliot 32 : http://www.virtualrobotix.com/page/multipilot32-1

VRIMU : http://www.virtualrobotix.com/page/vr-imu-10

VRI2C ESC: http://www.virtualrobotix.com/page/vr-bl-controller-10

 

The firmware is ArdupiratesNG 32 that i had implemented with some new libs and functionality :

The video is in italian but is simple to understand my test :

So i going in position manually , setup gps hold .

Take the quad and going far in other position ... then see the quad came back to original position.

After same test a leave the radio far from me :)

What do you think of my result. My impression is that the code is very good .

I'm using i2c esc and i see the fly is smooth and correction ,too respect of standard esc.

original post : http://www.virtualrobotix.com/profiles/blogs/multipilot-32-great-news

Best

Roberto

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Following Chris' post about the dronecell, here is a first use i've made with it.

 

 

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I combined a GPS, which is being read by a PIC controller, every X seconds, then every 5 readouts it will send the last 5 readings over SMS text message to my cellphone.

 

The idea is to create a small and compact device, with autonomous battery (that can be optionally charged off the main vehicle's battery) that will help you find your drone in case it gets lost or crashes.

 

i've not yet tested the battery life, but it should be holding for a good few hours.

i call it the Black box, though it's not the same as the traditional one...

 

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super thin design - only 16mm

 

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I've took apart the stock connector and antenna, both SMA connectors are very heavy !

here they are connected together and heatshrinked:

 

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for a total of 63 grams !

 

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I will be really liking this one, next time it will find my copter when getting lost,

after i lost a full quad arducopter in a forest, couldn't find it till today....

 

What i like about it, that it has the autonomous battery, and the quite-infinite range of a cellular network.

it will tell me where it is even when it crashes and the big battery get disconnected and thrown away,

even when it is out of range of my radio, my telemetry etc...

and even if, let's say, it gets stolen !

 

I just get an SMS on my cellphone with the 5 last points, including exact time longitude and latitude of each point.

 

 

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3D Robotics

User groups added to DIY Drones

3689411100?profile=originalNing (the social networking platform we're built on) has added a useful Groups function, so we've used that to start user groups.

 

If you have an ArduCopter or are using APM for a fixed wing aircraft, please join the relevant user group, which you can find in the column on the right of this page. Anyone can join these groups. (There is also a group for the site moderators, which you must apply or be invited to join).

 

User groups allow you to have more focused discussion on the specifics of one product or use. You can send messages to all the other group members, without the risk of spamming the entire site. And there is a Comment Wall for ad-hoc conversations that you may not want to bother the entire DIY Drones community with.

 

If there are other products you'd like us to create a user group for?

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3D Robotics

 

3689410675?profile=originalHere's a new board for people who want longer range than Xbee can provide. You just treat it as a regular serial port, just like an Xbee, and with the right code it can communicate with anything from a website to a phone. There's no APM code for it yet, but sample code is provided so you can find your own uses. Note that mobile wireless coverage can vary a lot from place to place, and some regions use cell towers that do not propagate to altitudes far above ground level. So your performance will depend a lot on the local networks. But in the right places, this could be really powerful.

 

"The DroneCell is a cell phone for your robotics/ electronics/ minicomputer/ anything project. Its an all-in-one communication device: communicate via texts, phone calls, or even over the internet. Any device with a TTL UART can communicate with the DroneCell. C libraries are available for download.

 
* Send and Receive Phone Calls
* Send Text Messages 
* Communicate over the Internet 
* Send and Receive Multimedia Messages ( pictures , text files )


Specifications:

  • LED indication for both network status and power
  • Small footprint (5cm x 4.5cm)
  • Breadboard compatible for easy prototyping
  • 4.5VDC-16VDC power supply input
  • 3.3V or 5V UART Interface (voltage-shifting is done on board)
  • High serial data rate (up to 115200 baud)
  • GPRS communication rate (86.5 kbps downlink) - cellular to server communication
  • CSD (up to 14.4 kbps) - cellular to cellular communication
  • Software configurable baud rate
  • Works with any SIM card
  • Quad band cellular connectivity
  • Internal switch to detect SIM card presence
  • Dial and receive phone calls (however, no microphone or speaker interface setup)
  • Send and receive text messages
  • Send and receive Multimedia Messages
  • Send and receive data to any Internet connected computer
  • Send and receive data over TCP or UDP sockets
  • Super long range (anywhere there is cell reception)
  • High altitude (at least 10,000 feet, up to 30,000 depending on Cell tower)
  • Phonebook entries and storage
  • Software libraries for AVR
  • Real time clock, synced to cellular tower time
  • User set alarms

In stock now for $120.

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Polarity Protection for Turnigy 9x Tx

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http://www.sparkfun.com/datasheets/Components/General/FQP27P06.pdf

 

 

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I'm currently waiting for my new Tx in the mail and will be doing a video. 

 

 You can use either a "P" or "N" channel Mosfet will work.  This curcuit works better than the Crowbar curcuit because it doesn't need a fuse, and with  less of a voltage drop.  "N" channel Mosfets are more common to find and be to used.   I have decieded to just make a reverse polarity connector instead of Modding the radio for a now.  I removed the charge port connector from the radio to use as passage way for my wiring.

 

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I used a balance connector to connect to the 11.1v Lipo.

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I removed the Tx charge connector and enlarged a whole for the wiring to pass through.

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Finished it up with some Velcro to hold the battery.  I have already noticed with a 1600mAh 11.1 LiPo my battery life has increased by 2 to 3 or more hrs.  SWEET!

 

Even better protection using both a mosfet and a charge pump IC.

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You can find the Charge Pump IC's online.

   Here:    Charge Pump IC

 

 

 

 

 

 

 

 

 

 

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3D Robotics


Sparkfun's new product showcase today has some cool gear that's useful for UAVs, In the video above, they demonstrate how to use the AttoPilot current sensors to measure voltage and current consumption in a quadcopter. APM supports this current sensor board, too, and now Sparkfun has several different versions for different currents:

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The AttoPilot boards provide a simple solution for reading voltage and current into your microcontroller. Now in addition to the 90A version, we also have 45A and 180A versions as  well. Voltage and current values are easily read into your favorite microcontroller and we've included example code for Arduino on the product pages.

Sparkfun has also updated its "9DoF" IMU board (below) to use the new Invensense 3000-series gyro, which combines XY and Z into one chip to make for a smaller board.

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