Just so you're aware I have had my FC working correctly (https://www.hobbyking.com/hobbyking/sto ... odule.html), before I crashed it!
Since then I have re-built my quad and now on testing it flips when I try and take off, this becomes very annoying as I'm damaging my new frame (spending more money=unhappy wife!)
The only changes I've made are as follows;
- 2.3 NAV firmware (updated from 2.3)
- The Mag was always off by 90 degrees (even with the board facing the correct way and properly calibrated and with the correct mag dec), therefore I have had to swap the mag orientation to resolve this
- the pitch and were also swapped, so I have had to modify this as well
now according to the Windows & Android GUI, it pitches and roll correctly, with the mag pointing the right way
All the ESC are correctly plugged in (must have checked this 100 times!)
The fault;
this is fairly simple, every time I try to take off, once it gets to the point where there's about to be some lift, it will suddenly flips (normally left!) violently, it will do this with or without angle mode on.
any suggestions would be greatly appreciated!!
Flipping on Take off (NOT ESC wrongly wired)
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- Posts: 51
- Joined: Thu Jul 10, 2014 2:13 pm
Re: Flipping on Take off (NOT ESC wrongly wired)
do you have any filtering on?
Re: Flipping on Take off (NOT ESC wrongly wired)
not currently, should I put the 42Hz on?
Re: Flipping on Take off (NOT ESC wrongly wired)
It sounds like a school example of a rotated controller board or swapped pins on Esc's
Hold the copter in a firm grip and rice throttle just a little.
Move the roll and Nick sticks on the TX and feel if it reacts correct.
If you tilt the copter in any direction it should resist any movements.
Another way to check motor outputs is to use #define DYNBALANCE
Run motors one by one from the gui.
Hold the copter in a firm grip and rice throttle just a little.
Move the roll and Nick sticks on the TX and feel if it reacts correct.
If you tilt the copter in any direction it should resist any movements.
Another way to check motor outputs is to use #define DYNBALANCE
Run motors one by one from the gui.
Re: Flipping on Take off (NOT ESC wrongly wired)
another strange thing, according to MultiWii Wki, the acc, gyro and Mag should do the following;
however no matter what I do, I cannot get;
MAG Z always goes up and the orientation is still out by 180 degrees, if I get the compass to head the right way, it's completely different to what it should be!
Also with the reading acting as they should, the roll is reversed, again, I can resolve this, but it then does not match the Wiki instructions!
I was wondering if this could be part of the problem?
How should be the sensor axis directions
TILT the MULTI to the RIGHT (left side up):
- MAG_ROLL, ACC_ROLL and GYRO_ROLL goes up
- MAG_Z and ACC_Z goes down
TILT the MULTI forward (tail up):
- MAG_PITCH, ACC_PITCH and GYRO_PITCH goes up
- MAG_Z and ACC_Z goes down
Rotating the copter clockwise (YAW):
- GYRO_YAW goes up
The copter stays level:
- MAG_Z is positive ; ACC_Z is positive
Magnetic sensors orientation
- X MAG: ROLL RIGHT = positive
-ROLL LEFT = negative
- Y MAG -PITCH FORWARD = positive
-PITCH backward = negative
- Z MAG -should be positive
-not move a lot if the multi remains flat.
however no matter what I do, I cannot get;
TILT the MULTI forward (tail up):
- MAG_PITCH, ACC_PITCH and GYRO_PITCH goes up
- MAG_Z and ACC_Z goes down
MAG Z always goes up and the orientation is still out by 180 degrees, if I get the compass to head the right way, it's completely different to what it should be!
Also with the reading acting as they should, the roll is reversed, again, I can resolve this, but it then does not match the Wiki instructions!
I was wondering if this could be part of the problem?
Re: Flipping on Take off (NOT ESC wrongly wired)
Thanks for the response PatrikE, I'm very sure my ESC are in the correct locations, but I will use the #define DYNBALANCE to test them.
My quads a little too big to hold while testing, without 2 hands and a helmet!
My quads a little too big to hold while testing, without 2 hands and a helmet!
Re: Flipping on Take off (NOT ESC wrongly wired)
This should be done without props!..
You can weight it down or tie it so it can't take off.
Are you sure of where north is?
It can be confusing if you sit towards south then the copter shows backwards in the gui if nose points forward.
Up on the screen is north.
You can weight it down or tie it so it can't take off.
Are you sure of where north is?
It can be confusing if you sit towards south then the copter shows backwards in the gui if nose points forward.
Up on the screen is north.
Re: Flipping on Take off (NOT ESC wrongly wired)
I'm happy where north is, my house is exactly south facing, so that's all fine
assuming the motor positions in the WinGUI (M3,M1,M2,M0) are position graphically where they should be, then, i'm happy the motors are plugged in correctly and rotating in the right direction.
I'll look at tying it down and testing it further!
assuming the motor positions in the WinGUI (M3,M1,M2,M0) are position graphically where they should be, then, i'm happy the motors are plugged in correctly and rotating in the right direction.
I'll look at tying it down and testing it further!
Re: Flipping on Take off (NOT ESC wrongly wired)
just confirm, that I resolved the problem, the X,Y,Z axis were off on the Accelerometer.
it was quite an arduous procedure of looking at the graphs and changing the X,Y,Z round and adding a - if they're going in the wrong direction, testing and repeat... although that's quads in all cases.
on an aside, I'm not entirely sure that for some reason it just decided to work and everything I was doing was for nothing, as I had installed a version of software that I knew worked on my quad before I changed my frame and that was flipping like crazy too... so unsurprisingly MultiWii has confused me again!
it was quite an arduous procedure of looking at the graphs and changing the X,Y,Z round and adding a - if they're going in the wrong direction, testing and repeat... although that's quads in all cases.
on an aside, I'm not entirely sure that for some reason it just decided to work and everything I was doing was for nothing, as I had installed a version of software that I knew worked on my quad before I changed my frame and that was flipping like crazy too... so unsurprisingly MultiWii has confused me again!