import time
from machine import Pin

led = Pin(4, Pin.OUT)
button = Pin(0, Pin.IN, Pin.PULL_UP)  

delay = 1.0  

while True:
    if button.value() == 0:
        delay -= 0.25 
        if delay < 0.25:
            delay = 1.0 
        time.sleep(0.2)  

    led.value(1)
    time.sleep(delay)
    led.value(0)
    time.sleep(delay)