from machine import Pin, WDT
import time

wdt = WDT(timeout=2000)
led = Pin(16,Pin.OUT)
btn = Pin(15, Pin.IN, Pin.PULL_UP)

while True:
    wdt.feed()
    led.on()
    time.sleep(1)
    led.off()
    time.sleep(1)
#    if btn.value() is 0:
#        x=15/0