Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old May 07, 2012, 07:07 PM
XR-4Drone.com
Joined May 2011
325 Posts
I just want to thank everyone that helped me get this mod working.
I finally got it up and running. Now it's time to learn to fly
dante1 is offline Find More Posts by dante1
Reply With Quote
Sign up now
to remove ads between posts
Old May 07, 2012, 08:02 PM
XR-4Drone.com
Joined May 2011
325 Posts
Can some recommend a decent Remote(TX) that is not to expensive yet easy to setup?

Thanks,

Dante1
dante1 is offline Find More Posts by dante1
Reply With Quote
Old May 07, 2012, 08:03 PM
Emress
sirbow2's Avatar
United States, SD, Rapid City
Joined Nov 2011
1,934 Posts
turnigy 9x with a TX battery! or a DX6, i guess...
sirbow2 is offline Find More Posts by sirbow2
Reply With Quote
Old May 07, 2012, 08:33 PM
XR-4Drone.com
Joined May 2011
325 Posts
Quote:
Originally Posted by sirbow2 View Post
turnigy 9x with a TX battery! or a DX6, i guess...
DX6 is a little bit pricey. The Turnigy is always backordered.
dante1 is offline Find More Posts by dante1
Reply With Quote
Old May 08, 2012, 12:02 AM
Registered User
Joined Apr 2012
38 Posts
Quote:
Originally Posted by kgeange View Post
Spent the weekend doing some test flights and captured some video on a GoPro mounted on the AR.Drone. During the final flight it crashed into the lake - I believe it might have been an issue with the rear left motor... as it's been slow to spin up at times and I've had a few minor crashes previously where the AR.Drone as spun out of control in a counter-clockwise direction.

AR.Drone - Flights and Crash in Lake
http://www.youtube.com/watch?v=ZXD9ou42ntw

I put the drone on the furnace overnight to dry out and when I got up this morning I went downstairs to check it out. To my surprise it started up correctly and responded to a TRIM and RESET from the DX6i. However when I went to take off it flipped backward a few times and on it's side once.

I wonder if this could be because of the navboard being fried or one of the motors malfunctioning. I have a new spare motor here so I'll try that first.

AR.Drone - Initial starts after drying the AR.Drone.
http://www.youtube.com/watch?v=DRw6pyhLaS4
May I know what your ARdrone firmware version is?

I also have the slow spin up problem on the rear left motor, the chance is about 2 out of 10.
Sometimes it even triggers emergency cut off(one orange before 4 reds).
This problem only occurs with 1.10.10 and 1.10.12, not 1.7.11 nor the pervious version.
This may be related to different motor software.
Variance of motor may also be the reason, you can rotate the propeller to feel the resistance of the un-powered motor .

But your crash started from right banking, not left one, so the slow-spin-up motor may not be related.

The reasons of the crash may include

Too much payload
System is able to lift off and hover does not mean it have enough reserved power to yaw and bank.
The upthrust needed for a 45 degree tilted vehicle is twice of it is leveled. (extra 15% for 30 degree)

CG may not be centered
Your Gopro seemed to be right shifted, doesn't it ?(or only right turned ?)

Too fast yawing
For such payload, system does not have enough reserved power to do that.

The flow before the crash could be like these,
Left yawing command received
System started the yawing by reducing 2 motors' speed. In order to maintain height and leveling, system will try to increase the other 2 motors' speed
The targeted speed of the latter exceeded the limit of the power system( speed controller and motor)
The targeted speed(hence the upthrust) was not attained, right side start to lose height earlier than left(may be because of the CG positioning or an right banking command), resulting a right banking.
System tried to increase all motors' speed to maintain height,but the targeted speed exceeded the limit of the power system, vehicle started to lose height.
...................

You should test the payload limit by using dummy weight with banking and yawing.
Also, I suggest you should disassemble the ARdrone to visual check whether everything is dried before further powered test.
ccme is offline Find More Posts by ccme
Reply With Quote
Old May 08, 2012, 12:15 AM
Registered User
Joined Apr 2012
38 Posts
Mod rev. 017 works with 1.7.11 ?

Miru, I want to test 1.10.12 and 1.7.11 with single sketch 0.17.
But the arduino LED keep solid green and does not go to fast blinking for the combination of 0.17 with 1.7.11.
Is it a special case of me ?
ccme is offline Find More Posts by ccme
Reply With Quote
Old May 08, 2012, 07:45 AM
Registered User
Joined Apr 2012
13 Posts
Thanks for responding ccme...

I am running 1.10.10, mirumod v17

Your reasoning sounds right on the mark. Drained battery might have been the crux of the issue as I was at the end of about 12 minutes of flight and had both a GoPro and 2250 mAH battery which is considerably heavier than the stock battery. The drone flew fine most of the time but a few times just previous to the crash the drone slowly descended and bounced off the ground before taking off again with the trottle pinned at the top. And right at the time of the crash I had the throttle pinned up but the drone kept descending...

The GoPro was pretty much centered but was angled diagonally which is why the video is taken a little off to the starboard side. As mentioned, during the flight the drone bounced a few times so that could have pushed the camera off center position a little I guess.

Regarding the flow you described it sounds dead on. I was starting to bank to get closer to the tree line (and away from the lake) and the drone seemed to initially yaw right and then spin left towards the lake.

So, that probably explains why the crash occurred. I tried the drone this morning and the first couple of attempts (with iPhone) caused a flip. However on the third attempt the drone flew fine again! I might have a failing motor(s) issue. I'll hook up the mirumod again and test with that later this afternoon when I have more time. Is there some way I can telnet in and view the motor logs to see if there are any issues reported. I seem to recall something about telnetting in and restarting the program.elf process or something like that.

Yesterday I ordered a 1.3 GHz 800 mW FPV Video TX/RX but based on these findings I'm not sure the AR.Drone can carry all this weight. Might have to ditch the GoPro for a smaller camera.

[Edit: The drone flys fine with the mirumod again after drying out. Must have been some moisture or debris somewhere or I have a bad motor. Very happy to have a working Drone after crashing in the lake.]

Thanks again...
kgeange is offline Find More Posts by kgeange
Last edited by kgeange; May 08, 2012 at 12:43 PM.
Reply With Quote
Old May 08, 2012, 08:10 AM
Registered User
Joined Feb 2012
83 Posts
Thanks Miru..
kman76 is offline Find More Posts by kman76
Reply With Quote
Old May 08, 2012, 08:56 AM
Registered User
Vista, CA
Joined Feb 2008
1,213 Posts
Quote:
Originally Posted by ccme View Post
Miru, I want to test 1.10.12 and 1.7.11 with single sketch 0.17.
But the arduino LED keep solid green and does not go to fast blinking for the combination of 0.17 with 1.7.11.
Is it a special case of me ?
0.17 works here with 1.7.11 . I did not try 1.10.12 .
miru is offline Find More Posts by miru
Reply With Quote
Old May 08, 2012, 11:17 AM
Registered User
Joined Feb 2012
83 Posts
Quote:
Originally Posted by miru View Post
Those 2 are female, you need a 2mm 2x5 male connector for Drone 2. I used mouser A3C-10P-2DSA .
Thanks..
kman76 is offline Find More Posts by kman76
Reply With Quote
Old May 08, 2012, 02:54 PM
Registered User
Joined May 2012
1 Posts
Quote:
Originally Posted by miru View Post
0.17 works here with 1.7.11 . I did not try 1.10.12 .
Hi miru, and thanks a lot for your very great mod.
i can say, it work very fine in 1.10.12

Mac
mac.intosh is offline Find More Posts by mac.intosh
Reply With Quote
Old May 08, 2012, 03:28 PM
Registered User
Vista, CA
Joined Feb 2008
1,213 Posts
Quote:
Originally Posted by mac.intosh View Post
Hi miru, and thanks a lot for your very great mod.
i can say, it work very fine in 1.10.12

Mac
Thanks, Mac.
miru is offline Find More Posts by miru
Reply With Quote
Old May 09, 2012, 04:35 AM
Registered User
Joined Apr 2012
38 Posts
Quote:
Originally Posted by miru View Post
0.17 works here with 1.7.11 . I did not try 1.10.12 .
There are 2 outcomes appear in random.
1. 4 pods LED turns red, Arduino LED blinks slowly in 1 flash.
2. Arduino LED and the 4 pods LED keep solid green .

I also tried to delay the downloading manually by wrong gear position(take off), wait for a period of time and switch back to landing. Tried 10, 20, 30......60 and 70 sec after the 4 green lights, sometimes 30 sec and 60 sec work, but the results seem to be random.

I tried change the NS_boot value to 34. It had worked for about 8 flights before in 100% success.
After I updated it to 1.10.12 and downgraded it to 1.7.11 again, 34 did not work anymore.


I use Drone Control and I have to do it twice every time for a successfully downgrading.
At every 1 st time I will get a log file with the following content

Usage /bin/checkplf <plf_filename>
<version_to_check>

At the 2nd time the content of the log file will change to

<version OK>

Something wrong with the downgrade process ?

Please help.
ccme is offline Find More Posts by ccme
Reply With Quote
Old May 09, 2012, 04:36 AM
Registered User
Joined Apr 2012
38 Posts
Quote:
Originally Posted by kgeange View Post
Thanks for responding ccme...

I am running 1.10.10, mirumod v17

Your reasoning sounds right on the mark. Drained battery might have been the crux of the issue as I was at the end of about 12 minutes of flight and had both a GoPro and 2250 mAH battery which is considerably heavier than the stock battery. The drone flew fine most of the time but a few times just previous to the crash the drone slowly descended and bounced off the ground before taking off again with the trottle pinned at the top. And right at the time of the crash I had the throttle pinned up but the drone kept descending...

The GoPro was pretty much centered but was angled diagonally which is why the video is taken a little off to the starboard side. As mentioned, during the flight the drone bounced a few times so that could have pushed the camera off center position a little I guess.

Regarding the flow you described it sounds dead on. I was starting to bank to get closer to the tree line (and away from the lake) and the drone seemed to initially yaw right and then spin left towards the lake.

So, that probably explains why the crash occurred. I tried the drone this morning and the first couple of attempts (with iPhone) caused a flip. However on the third attempt the drone flew fine again! I might have a failing motor(s) issue. I'll hook up the mirumod again and test with that later this afternoon when I have more time. Is there some way I can telnet in and view the motor logs to see if there are any issues reported. I seem to recall something about telnetting in and restarting the program.elf process or something like that.

Yesterday I ordered a 1.3 GHz 800 mW FPV Video TX/RX but based on these findings I'm not sure the AR.Drone can carry all this weight. Might have to ditch the GoPro for a smaller camera.

[Edit: The drone flys fine with the mirumod again after drying out. Must have been some moisture or debris somewhere or I have a bad motor. Very happy to have a working Drone after crashing in the lake.]

Thanks again...
Good to hear that your AR.Drone works again.
You changed one or two motors ?

With 2250mAh & a Gopro ? That surprised me.
What are the weights ?
12 mins + of flight time is also impressive.

Did you compare 1.7.11 with 1.10.10 ?
The throttle of 1.7.11 seems to be more powerful than 1.10.10. They are of different motor software.
Feel like the difference between 1st gear & 3rd gear.
For heavy loaded AR.Drone, may be 1.7.11 serve the purpose better than 1.10.10.

I am interested in FPV, I have not ordered the equipment yet, since my AR.Drone have midair motor cut off issue.

Before your equipment arrives, you may test more with different loads.
Keep updating your status.
ccme is offline Find More Posts by ccme
Last edited by ccme; May 10, 2012 at 04:36 AM.
Reply With Quote
Old May 09, 2012, 08:14 AM
Registered User
Joined Apr 2012
13 Posts
Didn't need to change either motor. Yesterday morning, the first two attempts to takeoff resulted in pretty aggressive flips and on the third attempt the drone hovered fine when I pressed the take off button!!! Not sure if I dislodged some debris in one of flips, if I cleared some moisture or if a component was seated better. However I'm relieved.

Was out flying yesterday afternoon for 15-20 minutes and during one flight I did notice that near the end of the flight the drone flipped (clockwise roll) 360 degrees and luckily since I was only .5 meters off the ground it landed in the grass right side up. Not sure if this was caused by a motor cutoff.

Naked GoPro is 96g
2250mAh battery (got it on eBay) is substantially heavier than stock battery (can't find exact specs but similar batteries are 140g)

My plan is to not use the GoPro for FPV but a small CCD Sony camera. The drone was really struggling to get off the ground with the GoPro and larger battery.

Ken
kgeange is offline Find More Posts by kgeange
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Mini-HowTo RC Controlled AR.Drone w/o WiFi! nosaari Multirotor Talk 116 Mar 14, 2014 02:23 PM
For Sale Parrot AR Drone w/TX/RX mod *Flies Nice* Z06 Tony Aircraft - Electric - Helis (FS/W) 4 Apr 16, 2011 09:42 PM
Discussion Wifi Boosted AR.Drone Fallengod Multirotor Talk 7 Feb 12, 2011 10:52 AM
Discussion And yet another AR drone Arial Video project taudronis Multirotor Talk 17 Dec 07, 2010 11:04 AM
Sold Parrot AR.Drone Four rotor platform control with your iPodTouch/iPhone/iPad Hoverup Aircraft - Electric - Helis (FS/W) 0 Oct 12, 2010 03:54 PM