from machine import Pin
from time import sleep_us, sleep_ms, ticks_us, ticks_diff

trigger = Pin(2, Pin.OUT)
echo = Pin(3, Pin.IN)
botao = Pin(4, Pin.IN, Pin.PULL_UP)

def medir_distancia():
    trigger.off()
    sleep_us(2)

    trigger.on()
    sleep_us(10)
    trigger.off()
 
    while echo.value() == 0:
        pass
        inicio = ticks_us()

    while echo.value() == 1:
        pass
        fim = ticks_us()

    duracao = ticks_diff(fim, inicio)
    distancia = (duracao / 2) / 29.1

    return distancia

while True:
    if botao.value() == 0:
        soma = 0

        for i in range(5):
            d = medir_distancia()
            soma += d
            sleep_ms(100)

        media = soma / 5
        media_mm = media *10
        print("Média: {:05.2f} mm".format(media_mm)) 

        sleep_ms(500)