from machine import time_pulse_us , Pin
import time

#define the trig and Echo PIn

TRIG_PIN = 14
ECHO_PIN = 12
lED = 27

trig = Pin(TRIG_PIN,Pin.OUT)
echo = Pin(ECHO_PIN,Pin.IN)
led = Pin(lED,Pin.OUT)

def get_distance():
    trig.value(1)
    time.sleep_ms(10)
    trig.value(0)
    
    #wait to recieve
    duration = time_pulse_us(echo,1,300000)

    #print(duration)

    #calculate distance in cm
    distance = (duration * 0.0343) // 2

    return distance
def open_led(distance):
    if distance < 200:
        led.value(1)
    else:
        led.value(0)


while True:
    obj_distance = get_distance()
    open_led(obj_distance)

    #print(f'distance : {obj_distance}')