from machine import Pin
import time

power = 0
led = Pin(19, Pin.OUT)
button = Pin(12, Pin.IN, Pin.PULL_UP)
checking = True
start = None
elapsed_t = None

while True:
    button_v = button.value()
    print(button_v)
    time.sleep(0.5)
    if checking:
        if button.value() == 0:
            power += 1
            print(power)
            start = time.time()
        if start:    
            elapsed_t = time.time() - start
        if elapsed_t == 2:
            checking = False
    
    elif not checking:
        led.value(1)
        time.sleep(0.5*power)
        led.value(0)
        break