from machine import Pin
from utime import sleep
led_1=Pin(3,Pin.OUT)
led_2=Pin(6,Pin.OUT)
led_3=Pin(12,Pin.OUT)
while True:
    led_1.on()
    sleep(1.5)
    led_1.off()
    sleep(0.1)
    led_3.on()
    sleep(1.5)
    led_3.off()
    sleep(0.1)
    led_2.on()
    sleep(1.5)
    led_2.off()