from machine import Pin
import time 
led1 = Pin(2, Pin.OUT)
led2 = Pin(4, Pin.OUT)
while True:
    led1.on()
    print('LED1 ON')
    time.sleep_ms(500)
    led1.off()
    print('LED1 OFF')
    time.sleep_ms(500)
    led2.on()
    print('LED2 ON')
    time.sleep_ms(500)
    led1.off()
    print('LED2 OFF')
    time.sleep_ms(500)
    led1.on()
    led2.on()
    print('LED1 ON/LED2 ON')
    time.sleep_ms(1000)
    led1.off()
    led2.off()
    print('LED1 OFF/LED2 OFF')
    time.sleep_ms(500)