@ K K Iyer

No it is not showing Armed in LCD display

First are you getting SAFE display or not?

Below SAFE it should say Self Leveling...
After that it should say either OK, or ACC not calibrated (something like that)

What does it say?

@ KK Iyer

Yes I got SAFE screen with acc calibration and in receiver test menu, I checked the steps you mentioned for rudder. If I move the rudder bottom right then in kk 2.1 fligh controller LCD screen showing right direction. But no where armed message not comming.

One more behavior I found that when I try to calibrate all ESC by pressing 1 and 4 button in kk 2.1 flight controller. Suddenly all 4 motor started spinning at same time but once the throttle pass thru screen goes off, motor spinning stopped and it never ran even after full throttle.

Quote from: K K Iyer on February 26, 2015, 11:24:36 PM
Sorry for delay. Got a call from Sooraj. His quad fly away, but was later found!

Sorry Surojit sir - for disturbing Iyer sir from helping you !

keep throttle to bottom and rudder to right and hold 2 sec.

Sooraj is the expert. He is quietly watching and seeing whether i am guiding you correctly or not  

But please let us go step by step, ok?
I asked you what was on the SAFE screen after SELF LEVELLING...
Does it say OK?

@sooraj
That's fine. No problem.

@K K Iyer

Thank you very much for all you efforts. Please let me know any work around you found. Sleeping time now. I have to go to office tomorrow.  

@ K K Iyer

Yes the first step is fine. KK 2.1 is showing "SAFE  self leveling OFF". Then in Second line it is showing ACC not calibrated.

Quote from: akhilzid on February 27, 2015, 12:11:33 AM
keep throttle to bottom and rudder to right and hold 2 sec.

Some times more than 2 seconds - now i get to remember my first days with a KK2 - I just hold the left stick to bottom right for a moment and release it - nothing will happen, it took 2 days for me to figure out I have to hold it there few seconds to arm KK2 !!!

Tomorrow go to ACC calibration in the menu, press enter and follow instructions.
It will not arm till ACC calibrated!
But will arm without ESC calibration.

Thank God i'm retired. After 40 years!
Good night.

Quote from: surojit_salt on February 27, 2015, 12:16:17 AM

Then in Second line it is showing ACC not calibrated.

Place your quad in a level floor, and calibrate accelerometers, don't move the quad while calibrating .

you are right sooraj, but most of them are only try within a fraction of second and shout "Not arming". thats why i said.

follow the steps,( After all the motor directions, props etc are correct )

1) Place the quad in level surface, Means pitch and roll angle should be zero, If not calibrate Accelerometer, (placing stationary in level surface.)

2) enter the receiver test menu, Here you can see the Interpreted value from each receiver channels.

3) Hold the elevator stick to down, the value against elevator should be b/w -100 to -90, If it is higher (>-90) or Lower (-100) Then change your elevator channel lower end position (in Tx) to adjust this to the needed range. Also while you move the elevator stick to down, 'Back' should be displayed against this channel (in LCD), If it is displayed 'Front' Instead of Back, Just reverse your elevator channel.
Now Move elevator stick to High end, and change endpoints to adjust max. value in bet ween 90 - 100 range. (Also it should display Front against this value) .
Now the configuration for your elevator channel is completed

4) Follow the above step for Aileron(Roll) and Rudder (Yaw) channels , But in this case it will be displayed Left or Right according to stick movement instead of front or back as for the elevator channel. Also adjust the min, and max. stick values to fit in the same range as set in elevator. Reverse  the required channels.

5) Now for throttle channel the min. stick value should be higher than -90 and max. value less than +90 . On throttle max, it should display 'full'.

6) Now your accelerometer and receiver are calibrated and set up.

7) Apply 20 - 30 % throttle, quad should not lift from ground .

8 ) Move elevator stick a little forward, back motors should speed up, and hence quad starts tilting to f/w , on moving elevator b/w ,  the quad should tilt b/w .

9) Check aileron and rudder channels also in this way.

10) Now every thing is fine and LIFT OFF  to the skies,  try to hover at one place and apply necessary trims to make it stable.

    Take your time - follow every steps ,    If you don't understand any thing, Feel free to ask out before breaking any props

Happy landing

@ K K Iyer

You are indeed a EXPERT in QUADCOPTER..... Finally my flight controller is armed and on full throttle all four motors are spinning.... Your steps worked like a charm......

@Akhilzid and @sooraj , THANKS GUYS for helping me in this problem.......

Haha.
After one weekend of experimentation, i've only reached a stage where i know how to start a car, but not how to drive it on the streets!

But the story continues...
I'm sharing it here as it may help others having similar problems. Hope Surojit doesn't mind.

We have since exchanged these PMs:
I have able to arm kk 2.1 flight controller. But now I found two problem.
1. All my motors are spinning in same direction
2. 4th motors spins fine for few seconds. Then it gets stopped.

Hope you did ACC calibration with the quad absolutely level. Otherwise when you open throttle, it will think that it is not level, and start some motors before others.

Now calibrate the ESCs/throttle like this:
Switch off Tx and Rx.
Switch on Tx and move throttle to full.
Press and hold down button 1 and 4 on KK.
Connect Rx battery while holding down button 1 and 4. You'll need a helper for this.
KK will register full throttle position.
Move throttle to idle. KK will register this.
Release button 1 and 4.
After this all motors will start at same time.

Front left (1) and rear right (3) should run clockwise.
Front right (2) and rear left (4) anti clockwise.
REMOVE ALL PROPS FOR SAFETY
Whichever motor direction is wrong, interchange any two wires between ESC and motor.

Let me know when you reach this stage. Best of luck.

Check the jumper wires  from kk2 board to receive for continuety with digital multimeter for the end to end continuety. As some of the jumperwires may be open between 2 ends...