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Old Oct 03, 2012, 05:02 AM
That tree again!!!!
thanhTran's Avatar
Germantown, MD, US
Joined Sep 2004
6,642 Posts
Quote:
Originally Posted by Shehwar View Post
Hey guys,
My friend wants to build a micro quadcopter for indoor flights.
I wanna ask if these motors will do the job.

http://www.hobbyking.com/hobbyking/s...idProduct=9663
Quote:
Originally Posted by sirbow2 View Post
yep, those will work. some 3x2 props, 4in+ frame, a 3.5A single cell ESC
I'm thinking about trying those motors out too. Have not had a chance to get to order them yet though. the 2g motors are too fragile to survive crashes
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Old Oct 09, 2012, 07:07 AM
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Joined Oct 2012
1 Posts
Hi!
I'm building a flight controller based on stm32 and MPU6000. I faced very similar problem to your2. Sometimes, the voltage at CPOUT stays low, then it may recover suddenly on the next power up. I also had some funny initialisation problem.
I'm using SPI.
I'm wondering if you had solved your problem and hoping that you can share you experience with me.
Thanks
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Old Oct 18, 2012, 05:42 AM
That tree again!!!!
thanhTran's Avatar
Germantown, MD, US
Joined Sep 2004
6,642 Posts
Hi Bengkiat
Yeah, I had some problems like that. I don't remember exactly how I fixed it. I think I had to add some long delay between the first initial reset and the regular init sequence. Also, disabling I2C in this regular init as well.
-Thanh
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Old Dec 10, 2012, 04:40 AM
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Joined Dec 2012
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Hi thanhTran,

I want to ask what is the total current draw by 4 motors when the quad is flying (approximate value is fine too). I have exactly same 10g motor, props and 6A plush ESC. My problem is total current draw by 4 motor is around1.2A and the total current cant not pass this value limit even I try to increase the throttle to highest. I had checked servo pulse and they are correct as I increase the throttle. Please help me out.

Regards,
Thar Thar
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Old Dec 10, 2012, 11:44 PM
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Joined Dec 2012
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Hi thanhTran,

Sorry to bother you. It is solved. Just cable issue.
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Old Dec 12, 2012, 02:23 AM
That tree again!!!!
thanhTran's Avatar
Germantown, MD, US
Joined Sep 2004
6,642 Posts
Hi TharThar,
Sorry for my late response. I'm glad you solved the problem.
Thanks
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Old Jan 01, 2013, 11:47 PM
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Joined Dec 2012
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Hi thanhTran,

I have been trying to understand your code. but not so sure yet.

I use gyro and accelerometer (both are analog) with complimentary filter.
PlaneAngleX = (0.95*(GyroRateY+PlaneAngleX))+ (0.05*DegreeXFromAccelerometer);

The result is stable and correct when motor are running at low speed (plane still at ground level). but when the speed is built up (plane still at ground level), the sensor reading is not stable anymore. I believe it is due to vibration. I even put foam. Result is a little stable and but still within +10 to -10 degree.

What kind of filter or algorithm you had implemented in your copter? kindly answer. Thank you.
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Old Jan 02, 2013, 01:09 AM
That tree again!!!!
thanhTran's Avatar
Germantown, MD, US
Joined Sep 2004
6,642 Posts
Hi Tharthar,
I've not had tried flying with any complementary filter or any kind of filter just yet. I've tried complementary filter on a bench but without motors. So I don't really know how it performs with vibration. Currently I'm also experimenting DCM, and I'm going really slow with it.
What gyro are you using? Maybe adding some low pass filter into the gyro readings before feeding them into the filter?
Thanks
-Thanh
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Old Jan 02, 2013, 10:13 PM
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Joined Dec 2012
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Hi thanhTran,

I am using UDB4 - PIC UAV Development Board (MMA7361 three axis accelerometer, IDG500 dual axis gyro and ISZ500 single axis gyro). All the motors and ESC are same.

I am building it from scratch. But not much know about algorithm or filter. I believe you only use gyro. I saw your flying which is very stable. I might need to look into hardware that are causing vibration and some low pass filter.
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Old Jan 03, 2013, 01:45 AM
That tree again!!!!
thanhTran's Avatar
Germantown, MD, US
Joined Sep 2004
6,642 Posts
Hi Tharthar

The code in my google code does not use any filtering. It just uses the gyro rate to stabilize the copter. It works well for sport flying or some hands off hovering, but it still drifts after some time and it doesn't correct the drifting on its own.
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Old Jan 16, 2013, 12:08 PM
Uix
ulix
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Joined May 2006
60 Posts
Hello
Here you have a version 8 gr RTF 6 axes. Based on the www.MultiWii.com


Video here
Test du pocket vol un peut plus rapide. (0 min 45 sec)


Thank
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Old Mar 28, 2013, 09:32 AM
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United States, FL, Melbourne
Joined Mar 2012
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Nice

Quote:
Originally Posted by Uix View Post
Hello
Here you have a version 8 gr RTF 6 axes. Based on the www.MultiWii.com


Video here https://vimeo.com/57046902

Thank
That's pretty impressive. Brushed motors? More details?
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Old Mar 28, 2013, 09:41 AM
Flight cadet
The Netherlands, OV, Enschede
Joined Jul 2012
275 Posts
where can I buy one?
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Old Mar 28, 2013, 08:49 PM
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Pennsylvania
Joined Nov 2008
219 Posts
More details please on the 8g quad in the video. Looks fantastic and tiny. :
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Old Mar 29, 2013, 09:08 AM
Uix
ulix
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Joined May 2006
60 Posts
Hello

Thank you for your interest in this Pocket Quad.
You can see all the information in French on the following website:

http://www.mk-fr.info/forum/index.php?topic=9982.0


Thank you ..
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