All motors are not in sync after flashing pixhawk and using it with raspberry pi

ArduCopter Copter 3.5
1

I have install pixhawk and tried to takeoff with raspberry pi 3 but all motors are not rotating . Kindly help me , my project submission date is near… I have same setup as yours plzzz help me out. Is it related to wrong configuration or any parameter?? plzz explain me step by step what to do with this setup

2

This could be due to many factors, wiring, esc calibration, radio, etc …
Your best bet is to exactly follow the wiki and guidance, starting here: http://ardupilot.org/copter/docs/initial-setup.html

3

I am using simonK esc, they dont need calibration?

4

They do. In fact as far as I know all ESCs (flashed with simonk, blheli, hobbywing proprietary, etc …) do, except for DJI escs.

5

Now they are spinning at same time but at different speed, what to do now??

6

This could be perfectly normal if you quad is not level, or imu is not calibrated. Even if quad is level or accel is calibrated, a slight difference is not unusual.

That said I’d redo/verify esc calibration just to be sure. Also calibrate imu and radio, check wiki.