:o I built a quadcopter and need to know about ESCsThe esc I have are DC5.5v to 12.6 and BEC 5V at do I need to clip the red wire on 3 esc and only one to feed the voltage to the controller?? thanks

You connect ground and signal from the 3-wire lead to the Arduino and use the Servo library.

You can power the Arduino 5V from the BEC if you want, but I personally wouldn't (I've seen ESCs explode!)

In a typical craft you'd use the receiver battery pack to power the electronics, as this has modest load and won't droop on power surges. Save the big battery for ESCs only.