from machine import Pin
from utime import sleep
sleep(0.1) # Wait for USB to become ready

led = Pin(15, Pin.OUT)
button = Pin(14, Pin.IN, pull=Pin.PULL_UP)
led.off()

def flash_led(not_used):
    print(button.value())
    for i in range(5):
        led.on()
        sleep(0.1)
        led.off()
        sleep(0.1)
        print('end')

button.irq(trigger=Pin.IRQ_FALLING, handler=flash_led)
k = 0
print('ready for test')
while True:
    sleep(0.25)
    print(k)
    k += 1