from machine import Pin
import utime

LED1 = Pin(0, Pin.OUT)
LED2 = Pin(1, Pin.OUT)
LED3 = Pin(2, Pin.OUT)
LED4 = Pin(3, Pin.OUT)
    
while True:
    LED1.value(1)
    LED2.value(0)
    LED3.value(0)
    LED4.value(0)
    utime.sleep(1)
    LED1.value(0)
    LED2.value(1)
    LED3.value(0)
    LED4.value(0)
    utime.sleep(1)
    LED1.value(0)
    LED2.value(0)
    LED3.value(1)
    LED4.value(0)
    utime.sleep(1)
    LED1.value(0)
    LED2.value(0)
    LED3.value(0)
    LED4.value(1)
    utime.sleep(1)
    LED1.value(0)
    LED2.value(0)
    LED3.value(0)
    LED4.value(1)
    utime.sleep(1)
    LED1.value(0)
    LED2.value(0)
    LED3.value(1)
    LED4.value(0)
    utime.sleep(1)
    LED1.value(0)
    LED2.value(1)
    LED3.value(0)
    LED4.value(0)
    utime.sleep(1)
    LED1.value(1)
    LED2.value(0)
    LED3.value(0)
    LED4.value(0)
    utime.sleep(1)