• Advertisement

Am I on the Right Track?

Discussions about anything arduino related.

Am I on the Right Track?

Postby delabu » Thu Aug 30, 2012 1:52 pm

I am building a drone for aerial photography and want it to be able to fly a pre-planned grid to take the photos and then come back where I will land it (aircraft, not multi rotor).

If possible, I want to use the IMU data later to add as much spatial position data to each photo as possible.

A nice to have is telemetry so I can track the plane and change the flight path.

Here is the AP and telemetry side kit that I have come up - my question is, is this all that I will need? Any better suggestions? Is the frequencies chosen ok for ZA?

ArduPilot 2.5 fully assembled : https://store.diydrones.com/APM_2_5_Kit ... ega-05.htm
433MHz Telemtry kit : https://store.diydrones.com/3DR_RadioTe ... 3dr433.htm
Barometrica Alt : https://store.diydrones.com/product_p/br-0011-01.htm
Arispeed sensor : https://store.diydrones.com/Kit_MPXV700 ... 2dp-01.htm

Anything important I'm missing?
delabu
 
Posts: 8
Joined: Thu Aug 30, 2012 11:55 am

Re: Am I on the Right Track?

Postby JohanMoelich » Thu Aug 30, 2012 4:30 pm

Hi, I can't be of much help as I don't know much about autopilots, but if you're looking for an IMU later on, my ArduIMU v3 is still for sale in the classifieds section.
User avatar
JohanMoelich
 
Posts: 234
Joined: Sat Aug 11, 2012 11:20 pm
Location: Durban

Re: Am I on the Right Track?

Postby PaulB » Thu Aug 30, 2012 5:47 pm

Hi have a look at mygeekshow.com last 5 episodes should help...
User avatar
PaulB
 
Posts: 50
Joined: Tue Jun 05, 2012 12:03 pm

Re: Am I on the Right Track?

Postby GarethRens » Thu Aug 30, 2012 7:37 pm

Hi Delabu

My practical knowledge of fixed wing flight is slightly limited. However, im fairly conversant with the ardupilot for multi-rotors.

Theres not "much" difference between using it for rotor craft or fixed wing. Different fw, different setup, same software etc.

Iv got a plane sitting in my bedroom that i going to be converting to autonomous flight with an APM1.
My biggest thing is i cant fly fixed wings yet, and havent had the time to do learn or perhaps just lazy.
I dont like crashing things, in all my flying of multi-rotors, iv had 1 semi-bad accident in over 150 flights.

To setup a fixed wing uav using any of the APMs, you need to start by getting all your gear working.

1. While flying, check that stabilize mode works and doesnt crash the plane. Adjust pids until it works. All features including auto work off the planes ability to stabilise itself.
If it dont fly in stabilize mode, it wont fly in circle, auto, rtl etc.

2. Check that loiter or circle mode works as defined. You need two people for this, one to watch the plane and catch it if anything goes awry. The other to man the ground station.
Also check logs to make sure ALT_Hold works within a few feet. Adjust pids until flight profile is acceptable. Important if you are going to be doing any kind of photographic gis, mapping or photogrammetry stuff.

3. Do a simple 3 waypoint mission. Adjust pids until you are happy with the navigation characteristics.

4. Add a camera and start shooting.

I digress, to answer your original question, your gear selection is fine for what you want to do :)
Obviously you still need a plane, esc and motor, start with a foamy with the motor at the back. Something easy to fix in case you prang it.
Also a dedicated BEC for the APM is essential! It must be a 5v bec.
All the IMU data is available in the mission logs after each misson as well as telem data available on the fly.
Telemetry is essential! You need to be able to see the plane on google earth while its flying to determine whether your pid adjustments are making things better or worse.
Doing it after landing is a shlep.

As far as i know you don't really need the "Barometrica Alt" as the apm has an extremely accurate barometer on it. Unless you want to log temperature as well.
The airspeed sensor is a good idea for accurate throttle control and auto navigation.


G:)
http://www.stuffinc.co.za
We sell all kinds of stuff, including multi-rotor UAV/Drones :ugeek:
User avatar
GarethRens
Site Admin
 
Posts: 478
Joined: Mon Jul 04, 2011 7:47 pm
Location: Vereeniging

Re: Am I on the Right Track?

Postby delabu » Sat Sep 01, 2012 3:12 pm

Thanks for all the informative replies everyone!

It seems the gear is good for what I want to do, with the exception that I don't need the baro sensor.

I'll be ordering my gear now and hope to put them on my plane soon(ish)!
delabu
 
Posts: 8
Joined: Thu Aug 30, 2012 11:55 am

Re: Am I on the Right Track?

Postby delabu » Thu Oct 11, 2012 6:31 pm

I built the drone, it flies autonomously and have now successfully captured it's first ortho-photo.

Thanks again for the feedback everyone.

For those that are interested in the results, read my blog post for more info (and a zoom-able and pan-able map of the photo) at http://africaskyeye.wordpress.com/2012/10/10/aerial-photography-part-ii/
delabu
 
Posts: 8
Joined: Thu Aug 30, 2012 11:55 am

Re: Am I on the Right Track?

Postby JohanMoelich » Fri Oct 12, 2012 10:17 am

Hi Etienne, once again well done! That composite photo looks great. If you were down here in Durban, I think your help would have been appreciated by the guys mapping the rivers for canoe marathons.
I wonder if anyone else spotted the girl in the bikini tanning in your photo? You need to zoom close to see it. :woot:
User avatar
JohanMoelich
 
Posts: 234
Joined: Sat Aug 11, 2012 11:20 pm
Location: Durban


Return to Arduino

Who is online

Users browsing this forum: No registered users and 1 guest

  • Advertisement

x