# 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.OUT)
frequency=5000
led=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  
    brightness = int(1023 * (1 - (distance / max_distance)))
    led.duty(brightness)
    print('Distance',distance)
    print('Brightness',brightness)
    time.sleep(2)