from machine import Pin
import time

led_pin = Pin(1, Pin.OUT)  # Replace 25 with the correct GPIO pin

while True:
    led_pin.value(1)  # Turn LED on
    time.sleep(0.5)   # Wait for 0.5 seconds
    led_pin.value(0)  # Turn LED off
    time.sleep(0.5)   # Wait for 0.5 seconds