from machine import Pin, time_pulse_us
from time import sleep_ms, sleep_us

trigger = Pin(21, Pin.OUT)
echo = Pin(23, Pin.IN)

while True:
    trigger.off()
    sleep_us(5)
    trigger.on()
    sleep_us(10)
    trigger.off()

    t = time_pulse_us(echo, 1)
        
    d = t / 5.88

    print (f"Distância:{d:.2f}mm")
    sleep_ms(2000)