from machine import Pin
from time import sleep

led = Pin(15, Pin.OUT)

btn_increase = Pin(16, Pin.IN, Pin.PULL_DOWN)
btn_decrease = Pin(17, Pin.IN, Pin.PULL_DOWN)

delay = 0.5

min_delay = 0.1
max_delay = 2.0

while True:
    led.toggle()
    sleep(delay)

    if btn_increase.value() == 1:
        delay = max(min_delay, delay - 0.1)
        print("Increased frequency. Delay:", delay)
        sleep(0.1)

    if btn_decrease.value() == 1:
        delay = min(max_delay, delay + 0.1)
        print("Decreased frequency. Delay:", delay)
        sleep(0.1)