from machine import Pin, PWM
from time import ticks_ms, sleep_ms

# Setup buzzer on GP13
buzzer = PWM(Pin(13))

start_time = ticks_ms()

while True:
  elapsed = ticks_ms() - start_time

  # First 7 seconds: slow beep (1 second)
  if elapsed < 7000:
    buzzer.freq(392)
    buzzer.duty_u16(32768)
    sleep_ms(200)
    buzzer.duty_u16(0)
    sleep_ms(800)

  elif elapsed < 10000:
    buzzer.freq(440)
    buzzer.duty_u16(32768)
    sleep_ms(100)
    buzzer.duty_u16(0)
    sleep_ms(200)


  else:
    buzzer.freq(261)
    buzzer.duty_u16(32768)
    sleep_ms(1000)
    buzzer.duty_u16(0)
    break