import machine
from machine import Pin,PWM
import utime,math
from utime import sleep,sleep_us
echo=Pin(12,Pin.IN)
trig=Pin(13,Pin.OUT)
pwm=PWM(Pin(2),freq=50,duty=0)
def Servo(servor,angle):
    pwm.duty(int(((angle)/180*2+0.5)/20*1023))
while True:
    trig.value(0)
    sleep_us(2)
    trig.value(1)
    sleep_us(10)
    trig.value(0)
    x=machine.time_pulse_us(echo,1)
    distance=(0.034*x)/2
    print('distance:',distance, 'cm')
    if distance>5:
        Servo(2,90)
        sleep(1)
    else: 
        Servo(2,0)
        sleep(1)