from machine import Pin
from time import sleep_ms
led1 = Pin(2, Pin.OUT)
button = Pin(23, Pin.IN)
while True:
    sw = button.value()
    if sw == 1:
        led1.on()
        print('LED1 ON')
        sleep_ms(500)
    else:
        led1.off()
        print('LED1 OFF')
        sleep_ms(500)