from machine import Pin
from utime import sleep
led1 =Pin(5, Pin.OUT)
led2 =Pin(4, Pin.OUT)
led3 =Pin(3, Pin.Out)


while True:
    led1.on()
    led2.off()
    led3.off()
    sleep(2)

    led1.off()
    led2.on()
    led3.off()
    sleep(2)

    led1.off()
    led2.off()
    led3.on()
    sleep(2)