from machine import Pin, time_pulse_us
import time
trig = Pin(3, Pin.OUT)
echo = Pin(2, Pin.IN)
led = Pin(14, Pin.OUT)
b = Pin(15, Pin.OUT)
while True:
    trig.low()
    time.sleep_us(2)
    trig.high()
    time.sleep_us(10)
    trig.low()
    t = time_pulse_us(echo, 1)
    d = t / 58
    print("Distance:", d)
    if d < 50:
        led.on()
        b.on()
    else:
        led.off()
        b.off()
    time.sleep(1)