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ArduCopter User Group

Discussion group for ArduCopter users

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DUPLICATING output PWM on several PINs

Started by Roberto Apr 12. 0 Replies

Hello,I wonder if it is possible to adjust ardu-software parameters (I need it for a boat, but the same question applies to a plane or a mutlirotor), in order to DUPLICATE output PWM on several PINs,…Continue

Tags: Y, duplicate, multi-engine

building your own APM hardware with arduino mega2560

Started by shanthosh ravikumar. Last reply by Joe Bredestege Mar 22. 6 Replies

i am trying to build the hardware itself .... as of now i have a i2c based mpu9150 only... i'm planning on buying the other sensors soon and maybe make a sensor sheild !! i have tried uploading the…Continue

Handling servos in ArduCopter.cpp

Started by Bernabe Puente Moure Mar 4. 0 Replies

Hello everyone.I am a developer with many years of experience but a complete newbie in Ardupilot.I'm trying to modify the ArduCopte.cpp controller to add the servo handling functionality just as…Continue

quadcopter model dynamique identification

Started by telli khaled. Last reply by telli khaled Mar 2. 3 Replies

hello everybody I confused about quad-copter model identification , since the quad is unstable in open loop ,then how can I identify it since is unstable ??? but if I add a controllers in loop of…Continue

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Comment by Dennis Fuente on January 7, 2014 at 12:14pm

hey guys 

Is it possible to go backwards in version say from 3.1 back to 2.9 my apm worked in 2.9 but came up with a problem in 3.1.

Thanks

Dennis 

Comment by Essam on January 5, 2014 at 11:49pm

Thank you all; I have making some progress towards my project while reading your inputs

Comment by Drone-University.com on January 3, 2014 at 2:12pm

@essam

You may have a look at this French site : http://airinov.fr/concept#/concept/télédétection

They are using 4 different lenses of which 2 different IR, specifically to do exacftly what you are looking for.

You may use Google automatic translation if you cannot read French.

Cheers


Moderator
Comment by Michael Pursifull on January 3, 2014 at 11:47am

@Essam: ArduCopter has no trouble at all climbing to 2200 AGL; in fact, it can get there very quickly.... the limiting factors here is regulatory and one of resolution and of vibration. As you are in the US, you'll need to stay under 400ft AGL. Being closer helps in that each pixel of your camera will cover a smaller bit of your target, meaning that it is generally more useful. It also means that whatever blur effect you have from high frequency vibration is a bit less destructive to the data, as long as it is within acceptable limits.

What is the reason you need to capture the entire area in a single shot (vs taking multiple shots in rapid succession using a patterned flight and stitching them together?) There are a growing number of software packages that stitch the photos together for you....

Comment by Sean Headrick on January 3, 2014 at 10:25am

@Essam As you are new to this technology, you may be overlooking the possibility of photo-stitching. In general terms this would allow you to take lower altitude, higher resolution images that could then be stitched together into a single flat image or into an actual 3D orthomosaic based on common points among the images or GPS tagging. It is still a pretty large area, but a fixed wing outfitted properly should be able to satisfy your requirements

  

Comment by Charles lakins on January 3, 2014 at 10:20am

I wouldn't say altitude is your problem until it comes to the camera resolution and filtering capabilities any craft given the amount of flight time required will perform the needed altitude and allow you the decent time to land too

 

to achieve the filtering required are there limits to distance to be effective ?

my concern is the farther away the less likely to get results usefull

Comment by Alan Jump on January 3, 2014 at 10:16am

@Essam Your operating altitude is going to depend on the field of view of your selected lens. If you need the camera to capture a single image to cover 120 acres, and your lens has a 38 degree viewing angle, my maths say you'll need to fly at around 2200 feet AGL. A wider-angle lens will reduce that altitude, but may distort the image.

Comment by Essam on January 3, 2014 at 10:02am

Hi everyone; Happy new year. I am new to this field but I am interested in building my own uav using this site support. The reason I need a UAV is for my agricultural research. I need to be able to capture a 120-acre field in one single shot/photo using a near infrared capable camera. I need near infrared because it helps identifying stressed vegetation (I would need both the red and near infrared reading to do this). I am concerned that I may need to fly too high to be able to see a 120 acre field in one shot; in this case what uav design/model would allow me to accomplish this task? I am thinking of buying a small camera and modify it so that it can capture both the red and near infrared area of the spectrum. I am on a small budget so not looking to spend thousands; especially on my first uav.. Many thanks

Comment by ShadowAir Ltd. on December 24, 2013 at 5:47pm

Removed as advertising.

Comment by Sean Headrick on December 24, 2013 at 12:40pm

I am a bit perplexed. I was helping to diagnose a problem on a friend's copter (quad) and found I could get nowhere without connecting to the APM through MP. I feel like I have a lot of experience with the APM but have not seen this. The yellow LED blinks as normal, but I get neither of the red or blue indicator leds. when I try to connect to MP i get a "No Heartbeats received" error message. I tried to connect through the CLI with no success. Would the yellow LED flash if the fuse was blown. Any suggestions are much appreciated.

 

 
 
 

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