Hi guys I hope some one can help. I am building a big quad copter, I have 400amp esc 20hp motors. I am using a kk2 board for now, after setting every thing up
only one motor works the other three esc act like they are not communicating with the receiver. They make the beeping noise like you didn't turn on your radio.
any one have an idea what is going on?

What are the esc. they may need to be calibrated.