from machine import Pin,Timer
import utime
timer=Timer()
trigger = Pin(14, Pin.OUT)
echo = Pin(15, Pin.IN)
led=Pin(16,Pin.OUT)
distance=0
def get_distance(timer):
    global distance
    trigger.high()
    utime.sleep(0.00001)
    trigger.low()
    while echo.value() == 0:
        start = utime.ticks_us()
    while echo.value() == 1:
        stop = utime.ticks_us()
        
    duration = stop - start
    distance = (duration * 0.0343) / 2
    print("The distance from object is ",distance,"cm")
    return distance

timer.init(freq=1, mode=Timer.PERIODIC, callback=get_distance)
while True:
    if distance<5:
        led.value(1)
    else:
        led.value(0)