from machine import Pin
import time
trig=Pin(5,Pin.OUT)
echo=Pin(4,Pin.IN)
led1=Pin(9,Pin.OUT)
led2=Pin(12,Pin.OUT)
while True:
    trig.off
    time.sleep_us(2)
    trig.on()
    time.sleep_us(2)
    trig.off()
    while echo.value()==0:
        siga=time.ticks_us()
    while echo.value()==1:
        sigb=time.ticks_us()
    tm=sigb-siga
    d=(tm*0.0343)/2
    if(d>50):
        led1.value(1)
        led2.value(0)
    else:
        led1.value(0)
        led2.value(1)
    print(d)
    time.sleep(1)