# implement upython script for reverse parking system 
import machine
from machine import Pin,PWM
import time

Trigger = Pin(23, Pin.OUT)
Echo = Pin(22, Pin.IN)
frequency = 5000
buzzer = PWM(Pin(14), frequency)

while True:
    Trigger.value(0)
    time.sleep_us(2)
    Trigger.value(1)
    time.sleep_us(10)
    Trigger.value(0)
    totaltime = machine.time_pulse_us(Echo, 1)
    distance = (totaltime * 0.034) / 2
    max_distance = 400
if distance < max_distance:
    buzzer.duty(50)
    print('Distance:', distance, 'cm')
else:
    buzzer.duty(0)

while True:
    measure_distance()
    time.sleep(0.1)