from HCSR04 import HCSR04
import time
import machine
sensor = HCSR04(13, 12)
led1 = machine.Pin(14, machine.Pin.OUT)
led2 = machine.Pin(27, machine.Pin.OUT)

while True:
    d = sensor.distance_mm()
    if d < 800:
        print('!!')
        led2.on()
        time.sleep(5)
        led2.off()
    print('dist', d)
    time.sleep(0.5)