from machine import Pin
import utime

trig = Pin(2, Pin.OUT)
echo = Pin(3, Pin.IN)
buzzer = Pin(18, Pin.OUT)

def ultra():
    trig.value(0)
    utime.sleep_us(2)
    trig.value(1)
    utime.sleep_us(5)
    trig.value(0)
    while echo.value() == 0:
        signaloff = utime.ticks_us()
    while echo.value() == 1:
        signalon = utime.ticks_us()
    timepassed = signalon - signaloff
    distance = (timepassed * 0.0343) / 2
    if distance < 50:
        buzzer.on()
        utime.sleep_ms(100)
        buzzer.off()
        utime.sleep_ms(100)
        print("Obstacle detected! Distance:", distance, "cm")
    else:
        print("The distance from object is ", distance, "cm")

while True:
    ultra()
    utime.sleep(1)