#4.2.1.1. 예제

from microbit import *

while True:

    pin0.write_digital(1) #초록색 

    sleep(2000)

    pin0.write_digital(0)   

    sleep(1000)

    pin1.write_digital(1) #파란색   

    sleep(2000)

    pin1.write_digital(0)   

    sleep(1000)

    pin2.write_digital(1) #빨간색  

    sleep(2000)

    pin2.write_digital(0)  

    sleep(1000)