I recently got the flight controller and unable to get a stable flight. the quadcopter is just moving randomly even though i m only giving just enough throttle to lift off. I stay in bangalore. Can any one help me out?

did you try self level on ?

ya i tried. Still no improvements.

can you please post some vids and pics of PID settings..


also did you calibrate the accelerometer/gyro ?

Here are the steps I think you should follow.

1. Upgrade to the latest firmware. You need a USBASP tool for these with a 10-6 pin adapter or jumper cables. You can get the latest firmwares here:
    KK2.1++ AiO R4 (My preference) or Steveis 1.19S1

2. Check that the CG of your quad is roughly balanced. The flight controller can compensate for imbalance, but try to keep it centred as far as possible.

3. Calibrate the accelerometer. Use a clinometer app on your phone to make sure that the quad is completely level. This is VERY important.

4. ESC throttle range calibration. TAKE THE PROPS OFF for this step. Check the firmware docs for the procedure, there is quite a difference between Steveis and RC911 firmware

5. Go to the receiver test menu and make sure that the values are zero for aileron, elevator and rudder (roll, pitch and yaw respectively). If they are not, use your radio trims and/or subtrims to make sure they are zero. Additionally, the AIO firmware will show the text "centre" when they are centred. When you move the sticks to the extremes, the values should be between -90/-100 and +90/+100. Set the endpoints/limits on your radio to ensure this.

6. The default PI values should be OK to start you can tune from there. Take the quad outside, arm it and take off. Try to fly around chest height to minimise the 'ground effect' which makes the quad unstable. If you notice a consistent drift in any direction when you leave the sticks, you can use a couple of clicks of trim to counter it.

7.  PI Tuning Follow this procedure for the roll/pitch/yaw as well as self level gains. Try flying in acro mode first and use self level after tuning in acro.

@kaushik kops,
The post by sk1701 gives the logical sequence of what you should try.
Please try one step at a time.
Often the problem is due to not going sequentially.

But really, you should mention details of which quad/motors/ESCs/flight controller/props/battery/all up weight when posting a query. This is the best way to get a specific reply.

You may like to see this thread:
http://www.rcindia.org/kites-trains-free-flight-and-all-others/hobby-king-kk-2-1-flight-controller-is-not-getting-armed-with-fsct6b-transmitter/msg217532/#msg217532

@sk1701 sir,
A few weeks back i had tried the steps in the PI Tuning link you mentioned.
Before i did, i wrote down the settings i'd found by trial and error.
That was a lucky precaution, enabling me to return to my own settings that appear to suit me/ my quad better (QK ST360/kk2.1/steveis 1.19s1). 
Not mentioning details as they will vary from quad to quad and person to person.
Regards.

Iyer Sir, this PI tuning link worked for me but it doesn't mean it will work for everyone. As you said, it is different for every quad. It is a good thing you mentioned to kaushik, that the details of the setup are very important and so is taking it step by step. And Sir, I am 16 so please do not call me 'Sir'

Not sure how many will get this reference but...

"I am no ser!"

Sorry OP, i couldn't resist

I'm no hound and i've throne no games.
I am 60, going on 70, i know that i'm naive...

@koushik kops
Won't hijack your thread any more. Sk1701 can pm me for clue if required...

here are the details of my quadcopter:

1. kk2.0 flight controller (not kk2.1)
2. EMAX MT2213-935KV Multicopter Motor with 10x4.5 propeller
3. Hobbywing Skywalker Quattro 25Ax4 UBEC Brushless ESC
4. Wolf pack 2200mah 25C 3s LIPO battery
5. Turnigy 9x transmitter and receiver
6. hiller Q450 quad frame.

 

@SK1701

my flight controller is KK2.0 i think i cant update my firmware to the ones you have suggested.

Right now it has only stock firmware. I dint update to any other firmware.

@madaquif
i calibrated my acc and gyro.

Which is your current firmware version on kk2.0 ?
I see your I gains are set to 0 you have to adjust that.

good info. you are right, stevesis firmware is not supported by kk2.0. update to v1.6 which is one of the stable build till now.

I realised that the firmware that i had on the board was 1.2. Today i updated the firmware to 1.6 using an arduino itself. The quadcopter does not wobble so much now and is quite stable. But i noticed that there was a little yaw and pitch. It got late so i couldnt do much adjustments today. So i ll continue my work tomorrow. It would be helpful if you guys could tell me how to adjust and calibrate P and I values.

in one of the tutorial that i went through they kept the I Gain as 0 so i copied that.