Sonsivri
 
*
Welcome, Guest. Please login or register.
Did you miss your activation email?
December 09, 2016, 12:29:27 12:29


Login with username, password and session length


Pages: [1]
Print
Author Topic: quad rotor helicopter  (Read 3874 times)
0 Members and 1 Guest are viewing this topic.
xloving
Guest
« on: February 14, 2010, 02:56:44 14:56 »

some one working with quadrotor helicopter ??
we are planning to build the same using a dspic 30f series. but really speaking i am new to this programming and control.. if someone can help me it would be a real help..
i need the help even for the algorithm development..

we have bought a 6 degrees of freedom inertial measurement system from sparkfun which has 3 axis accelerometer and 3 axis groscope..
but dont know how to use it for the stabilization..

our first phase is to make the helicopter stable in air.. the movement and control for motion will come in second phase only..
if someone can help i would be really thankfull..

thank you
xloving 
Logged
frasenci
Translator
Active Member
***
Offline Offline

Posts: 162

Thank You
-Given: 119
-Receive: 84


« Reply #1 on: February 14, 2010, 03:55:08 15:55 »

Hi, you do not mention the scale ( size ) of your proyect.
I did something like this with 3 axis acel onboard an RC Helicopter. ( Radio Controlled )
Used 2 parallel 16F877A on board. Of course now we have better CPUs....

Please explain about scale and purpose of your proyect and I will be glad to share my expreriences

Greetings
Francisco
Logged
xloving
Guest
« Reply #2 on: February 14, 2010, 04:14:36 16:14 »

size of the project in the sense??
 money or physical size..Huh

the hardware is already there..
we just have to deal with the control system.. the pcb design,etc
Logged
sputnik
Junior Member
**
Offline Offline

Posts: 40

Thank You
-Given: 9
-Receive: 39


« Reply #3 on: February 14, 2010, 06:44:50 18:44 »

Please note that there are plenty of these projects already online with plenty of information available.

I would not recommend starting from scratch since you noted you are new to programming/control. The PID algorithms for stabilization are no piece of cake.

What airframe do you have?  The X-Ufo?

There are DIY and ready made boards out there that you could use, look at the X3D board or the UAVP board. Or look on RC Groups, there is plenty of info on converting existing brushless controllers for I2C control as well as some main board info.

I have had an Xufo that I modified, as well as a Y-Ufo (3 rotor). I have some drawings of an airframe I was designing that I never completed.
Logged
th_sak
Active Member
***
Offline Offline

Posts: 141

Thank You
-Given: 149
-Receive: 149



« Reply #4 on: February 14, 2010, 08:31:44 20:31 »

A good project for UAVs http://www.mikrokopter.com/ucwiki/en/MikroKopter/

Google is your friend...
Logged
sputnik
Junior Member
**
Offline Offline

Posts: 40

Thank You
-Given: 9
-Receive: 39


« Reply #5 on: February 15, 2010, 01:36:15 01:36 »

A good project for UAVs http://www.mikrokopter.com/ucwiki/en/MikroKopter/

Google is your friend...

Forgot to mention the Mikrocopter!!!   It is one of the best and what I based my Xufo mods on!!!

Logged
xloving
Guest
« Reply #6 on: February 22, 2010, 12:51:49 12:51 »

but i got a simple doubt..
just to keep the helicopter stable in air i should use accelerometers or gyrocopes??
if accelerometer.. then what about the effects from the external forces like the disturbances we give etc..

if gyro then it gives angle turned in seconds..
should i convert it to angle using real time numerical integration or some other ways to deal with the angle tilt measurement??
Logged
sputnik
Junior Member
**
Offline Offline

Posts: 40

Thank You
-Given: 9
-Receive: 39


« Reply #7 on: February 22, 2010, 11:12:33 23:12 »

but i got a simple doubt..
just to keep the helicopter stable in air i should use accelerometers or gyrocopes??
if accelerometer.. then what about the effects from the external forces like the disturbances we give etc..

if gyro then it gives angle turned in seconds..
should i convert it to angle using real time numerical integration or some other ways to deal with the angle tilt measurement??


To do it properly you would actually use both, a fully complemented IMU (Inertial Measurement Unit). However, 3 gyros, one for each axis will get you pretty darn stable.

With either you will need some sort of feedback loop and digital filtering, PID for instance.

No reason to doubt any of this, and no reason to try to re-invent what is already been done very well.

Just look at the Mikrocopter. It uses 3 gyros for, roll, pitch, yaw, and a pressure sensor for altitude, and it is extremely stable.

Just look at the 6 rotor version of the Mikrocopter here  http://vimeo.com/6194911


Logged
Pages: [1]
Print
Jump to:  


DISCLAIMER
WE DONT HOST ANY ILLEGAL FILES ON THE SERVER
USE CONTACT US TO REPORT ILLEGAL FILES
ADMINISTRATORS CANNOT BE HELD RESPONSIBLE FOR USERS POSTS AND LINKS

... Copyright 2003-2999 Sonsivri.to ...
Powered by SMF 1.1.18 | SMF © 2006-2009, Simple Machines LLC | HarzeM Dilber MC