from pyfirmata import Arduino, util
board = Arduino('/dev/ttyACM0')
import time

r, g, b = 0, 1, 1
pin3 = board.get_pin("d:3:p")
pin5 = board.get_pin("d:5:p")
pin6 = board.get_pin("d:6:p")
for i in range(10):
    pin3.write(r)
    pin5.write(g)
    pin6.write(b)
    r, g, b = g, b, r
    time.sleep(1)