from machine import Pin
import time

print("Hello, ESP32!")

trig = Pin(5, Pin.OUT)
echo = Pin(14, Pin.IN)
buzzer = Pin(13, Pin.OUT)

def get_distance():
    trig.off()
    time.sleep_us(2)
    trig.on()
    time.sleep_us(10)
    trig.off()
    
    while echo.value() == 0:
        pulse_start = time.ticks_us()
    while echo.value() == 1:
        pulse_end = time.ticks_us()
    
    pulse_duration = time.ticks_diff(pulse_end, pulse_start)
    distance = (pulse_duration * 0.0343) / 2
    return distance

def buzz():
    buzzer.on()
    time.sleep(0.1)
    buzzer.off()
    time.sleep(0.1)


while True:
    distance = get_distance()
    print("Distance:", distance, "cm")
    
    if distance < 50:
        buzz()
    
    time.sleep(1)