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Calling All Custom Multi-Copter Pilots!

Started by Forrest Frantz. Last reply by Forrest Frantz yesterday. 10 Replies

I plan to do what is called a "pull" to made changes to the custom code regarding custom shaped copters.  This change in code would only impacts irregular shaped quads, hexas, and octas when the…Continue

solar panel with lipo battery pack

Started by yuvraj. Last reply by james sowell on Tuesday. 9 Replies

I have the solar panel plate the description follow belowMaximum power (PMAX)- 5WVoltage at maximum power (VMP) - 17VCurent at maximum power (IMP) - 0.8 AMPShort circuit current (ISC) - 1.3 AMPOpen…Continue

Tags: lipo, panel, solar

Basic Python Scripting through Mission Planner

Started by Jaytanya Rajachandrasekar on Monday. 0 Replies

Hi Everyone,I am a beginner in UAV. I am trying to do a very basic navigation of a quadcopter like takeoff, hover and land, through Mission Planner using Python.I am having some difficulties on the…Continue

Building Copters with Round Tubes - Stronger, Lighter, Easier to Mount Motors than Square Tubes

Started by Forrest Frantz. Last reply by Jon Dec 13. 237 Replies

Round tubes offer the following pros:handle twist better than square tubes.  Thus for the strength, are far lighter.are more readily available (pipes, tubes, arrows, kite frames, golf clubs and…Continue

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JDrones
Comment by Jani Hirvinen on December 17, 2012 at 7:00pm

Andrew. Looks like you have a big problem. I am not sure if 3DR frames are designed for big motors and big propellers but way how they are in your hexa is bad and you cannot use it like that. all jDrones frames are fully tested with 12" propellers. I would suggest to use only 10" props on that your current hexa.

Comment by Andrew McKinstry on December 17, 2012 at 10:10am

Hello.. Shiny new hexa with all the toys about to leave bench (I hope).. however prop clearance issue! Or am I missing something.. 880 motors 11x4.7 props

thanks

Comment by avionics on December 9, 2012 at 9:45am

2012-12-09%2020-01-10.tlog

 

Hi Guys

I was in the middle of tuning for my Loiter and suddenly the quad started coming down out of control and crashed. Luckily no damage but it went out of control. this is the log i appreciate if any one can help and see what went wrong. thanks

 

2012-12-09%2020-01-10.tlog

 

Comment by avionics on December 7, 2012 at 8:16am

OK I got the Loiter going almost good. I had problem with my CH_6 knob on TX. fed the info directly from the ground station. all good for now. Thanks.

 

Comment by avionics on December 6, 2012 at 10:26pm

@Randy

Randy thank you for the response. Frankly I dont really know what to look for in the log. any idea what i should expect in the log? sorry I have never done this before.

Comment by Randy Brazeau on December 6, 2012 at 11:38am

@Avionics

Have you reviewed the logs? That would be a good starting point to see what is happening.

Randy

Comment by avionics on December 6, 2012 at 11:04am
I have a H.A.L quad by hobby king with 1200kv motors and freshly assembled. It flies beautiful in stablise and alt Hold and when i try to loiter it doesnt hold its position. The GPS both LEDs are locked and steady before i start. It drifts and loses altitute very slowly. Tried playing with PIDs but no luck. I ran out of ideas appreciate if anyone can throw some light. Does the WP loiter config PIDs have any effect whilst on loiter or it is only for when on Auto mode? Thanks for the help in advance.
Comment by Chris Gough on November 29, 2012 at 1:36am

@Shayam, if you want to experiment with quaternions, DCM, euler angles, etc. you might want to check out the various pluggable AHRS subsystems in paparazzi.

http://paparazzi.enac.fr/wiki/Subsystem/ahrs

Comment by Shyam Balasubramanian on November 29, 2012 at 1:24am

@Randy, Thanks for that nice explanation on accelerometer with quads! Now, my understanding gets better.

I would want to try out Quaternions once myself, it seems different people are having different opinion. My friend, who works purely on Quad uses quaternion. He mentioned to be that it was 'much' faster than DCM. But, since truth is one but scenarios differ, I will ask him if he can lend me some benchmarking ;)


Developer
Comment by Randy on November 29, 2012 at 1:15am

@Shyam re Quaternions,

     There's a thread by Bill Premerlani re DCM vs Quaternions.  My understanding is that they're equivalent.  II think perhaps DCM is faster but maybe not, i'm not sure.  I don't think it's as simple as one has 4 elements so it's faster than the other that has 9.

     When the copter/plane accelerates in any direction, the accelerometers sees this.  The problem is that we generally use the accelerometers to tell us which way is down.  So any acceleration of the copter/plane has the potential to throw off our attitude estimate.  Normally the accelerations are short-lived so they don't cause much problem but if they're long lived (for example you're constantly travelling in a circle) it can be a real problem.

-Randy

 
 
 

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