from hcsr04 import HCSR04
import time
import machine 

buzzer_pin = machine.Pin(0, machine.Pin.OUT)
buzzer = machine.PWM(buzzer_pin)

buzzer.freq(1047)
sensor = HCSR04(trigger_pin=12,
                echo_pin=14,
                echo_timeout_us=1000000)

while True:
    distancia = sensor.distance_cm()
    if distancia < 100:
        buzzer.duty(50) #Som
        time.sleep(1)
    else:
        buzzer.duty(0)  #Mudo
        time.sleep(1)