from machine import Pin
import time
trigger_pin = machine.Pin(1, machine.Pin.OUT)
echo_pin = machine.Pin(2, machine.Pin.IN)
LED=Pin(3,Pin.OUT)
distance=0
def measure_distance():
    trigger_pin.value(1)
    time.sleep_us(10)
    trigger_pin.value(0)
    while echo_pin.value() == 0:
        pulse_start = time.ticks_us()
    while echo_pin.value() == 1:
        pulse_end = time.ticks_us()
    pulse_duration = pulse_end - pulse_start
    distance = (pulse_duration / 2) / 29.1 
    return distance
try:
    while True:
        distance = measure_distance()
        print("Distance:", distance, "cm")
        time.sleep(1)
        if(distance<10):
          LED.value(1)
        else:
          LED.value(0)
except KeyboardInterrupt:
    print("Measurement stopped by user")