import machine
import time

led1 = machine.Pin(23, machine.Pin.OUT)
led2 = machine.Pin(22, machine.Pin.OUT)
led3 = machine.Pin(21, machine.Pin.OUT)
led4 = machine.Pin(19, machine.Pin.OUT)
led5 = machine.Pin(18, machine.Pin.OUT)

while True:
    led1.value(1)
    led2.value(1)
    led3.value(1)
    led4.value(1)
    led5.value(1)
    time.sleep(0.5)
    led1.value(0)
    led2.value(0)
    led3.value(0)
    led4.value(0)
    led5.value(0)
    time.sleep(0.5)