from machine import Pin, PWM
import time

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

led = Pin(15, Pin.OUT)
buzzer = PWM(Pin(14))
buzzer.duty_u16(0)

def get_distance():
    trig.low()
    time.sleep_us(2)
    trig.high()
    time.sleep_us(10)
    trig.low()

    while echo.value() == 0:
        start = time.ticks_us()
    while echo.value() == 1:
        end = time.ticks_us()

    duration = time.ticks_diff(end, start)
    distance = (duration * 0.0343) / 2
    return distance

while True:
    dist = get_distance()

    # LED condition (<10 cm)
    if dist < 10:
        led.value(1)
    else:
        led.value(0)

    # Buzzer condition (<50 cm)
    if dist < 50:
        buzzer.freq(100)
        buzzer.duty_u16(30000)
    else:
        buzzer.duty_u16(0)

    time.sleep(0.1)