from machine import Pin , PWM
from time import ticks_ms, sleep_ms
buzzer = PWM(Pin(13))
btn = Pin(12,Pin.IN) 
while True:
    if btn.value()== 1:
        start_time = ticks_ms()
        while btn.value() == 1:
            elapsed = ticks_ms() - start_time
            sleep_ms(100)
        final = ticks_ms() - start_time
        if 880<=final<=1020:
            buzzer.freq(261)
            buzzer.duty_u16(32768)
            sleep_ms(500)
            buzzer.duty_u16(0)
        elif 1880<=final=<2020:
            buzzer.freq(329)
            buzzer.duty_u16(32768)
            sleep_ms(500)
            buzzer.duty_u16(0)
        else:
            buzzer.duty_u16(0)
            sleep_ms(1000)