import machine
import time

led_pin = 18
button_pin = 15

led = machine.Pin(led_pin, machine.Pin.OUT)
button = machine.Pin(button_pin, machine.Pin.IN, machine.Pin.PULL_UP)

led_state = False

def toggle_led(pin):
    global led_state
    led_state = not led_state
    led.value(led_state)
button.irq(trigger=machine.Pin.IRQ_FALLING, handler=toggle_led)

try:
    while True:
        time.sleep(0.1)
except KeyboardInterrupt:
    print("Program interrupted")