from machine import*
from time import*

led1 = Pin(1,Pin.OUT)
led2 = Pin(3,Pin.OUT)
led3 = Pin(7,Pin.OUT)
led4 = Pin(10,Pin.OUT)

while True:
#blink led1
    led2.value(0)
    led3.value(0)
    led4.value(0)
    for i in range(2):
       led1.value(0)
       sleep(0.5)
       led1.value(1)
       sleep(0.5)
    sleep(2) 

 #blink led2
    led2.value(0)
    led3.value(0)
    led4.value(0)
    for i in range(2):
       led2.value(0)
       sleep(0.5)
       led2.value(1)
       sleep(0.5)
    sleep(2)     

#blink led3
    led2.value(0)
    led3.value(0)
    led4.value(0)
    for i in range(2):
       led3.value(0)
       sleep(0.5)
       led3.value(1)
       sleep(0.5)
    sleep(2) 

#blink led4
    led2.value(0)
    led3.value(0)
    led4.value(0)
    for i in range(2):
       led4.value(0)
       sleep(0.5)
       led4.value(1)
       sleep(0.5)
    sleep(2)