i have crius aiop v2 board*(multiwii code) .. i had arming problem for it.. i tried everything but could not arm it..
later i found out that i can set it up to get armed from channel 5... so i configured it and armed it with channel 5..
it is arming with channel 5 and when i give slight throttle up only 2 motors spin, even at different speed and the motors are not spinning continuously but instead they are spinning in PWM fashion ... and when i go on increase throttle the rest of motors start to spin... but they are all spinning at different speeds... because of this the quad is not able to lift and fly..
i have done following things..in multiwii
1.esc calibration..
2.radio calib
3.accel calib
4.magnetometer calibration

please help me

Nitin, I'm too building with Multiwii megapirate AIO board and was hit with same issue, I was able to arm the motor with Yaw, I use multiwii code and arming is set to " #define ALLOW_ARM_DISARM_VIA_TX_YAW".

For all the motors to spin in same speed you need to adjust the trim in Tx, set the trim for YAW,ROLL and PITCH equal to 1500 (may be +1) check with value with Multiwiiconf GUI, with this set when you increase the throttle all the motors will spin equally

please see this for esc calibration
https://code.google.com/p/multiwii/wiki/ESCsCalibration

Quote from: Purush on September 29, 2015, 12:44:08 PM
Nitin, I'm too building with Multiwii megapirate AIO board and was hit with same issue, I was able to arm the motor with Yaw, I use multiwii code and arming is set to " #define ALLOW_ARM_DISARM_VIA_TX_YAW".

For all the motors to spin in same speed you need to adjust the trim in Tx, set the trim for YAW,ROLL and PITCH equal to 1500 (may be +1) check with value with Multiwiiconf GUI, with this set when you increase the throttle all the motors will spin equally

i calibrate rc exactly as you said but still problem exists

Quote from: Darshan for multirotors on September 29, 2015, 02:43:13 PM
please see this for esc calibration
https://code.google.com/p/multiwii/wiki/ESCsCalibration

bro i have calibrated esc manually 

As you say that even after you have done it manually(do you mean individually ) the motors aren't starting at the same time.. that means you need to a calibrate  your escs through the fc..
That's why I gave you that link.. After you are done with that procedure, your motors will start at the same time...

Quote from: Darshan for multirotors on September 29, 2015, 09:23:44 PM
As you say that even after you have done it manually(do you mean individually ) the motors aren't starting at the same time.. that means you need to a calibrate  your escs through the fc..
That's why I gave you that link.. After you are done with that procedure, your motors will start at the same time...

ya bro you were right i calibrated the esc from board as you said now all the motors are spinning ... but its trying to flip as it gets up.. i think i need to carefully trim transmitter for that one...
one more question i had ..
when i push the throttle up,rudder right, roll right, pitch up.. all those values should increase and values should decrease for opposite direction am i right??

thank you very much for your help

Can you take a screen shot of your GUI  and post it here..
Btw did I you set your tx end points?