print("Sirene policial")

import machine
import time
from machine import PWM, Pin

led_1 = machine.Pin(2,machine.Pin.OUT)
led_2 = machine.Pin(4,machine.Pin.OUT)
i = 0


while True:
    tone = PWM(Pin(0,Pin.OUT), freq = 500, duty = 512)
    led_1.value(1)
    led_2.value(0)
    time.sleep(0.25)
    tone.deinit()

    tone = PWM(Pin(0,Pin.OUT), freq = 300, duty = 512)
    led_2.value(1)
    led_1.value(0)
    time.sleep(0.25)
    i+=1
    tone.deinit()
    print( "Número de ciclos: "+ str(i))