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Hi,i'm building my first quadcopter with arduino UNO, GY521 and a 9x8cv2 receiver like in this picture http://www.mediafire.com/view/2ff69s7des7d6vs/spiegazione_quadricottero.png But after connecting all it don't work! Motors do 3 beep and then 1 beep every second but they don't work. I think...