print("+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=")
print("\n\t      Reverse Parking System")
print("\n\t\t\tBy:\n")
print("\t[Muhammad Irfan Bin Mohd Fardaus]")
print("\t\t   (7/11/2024)\n")
print("+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=")

#import library
import HC_SR04
from machine import Pin, PWM
from utime import sleep

#pin declare
TRIG = Pin(13, Pin.IN)
ECHO = Pin(14, Pin.IN)
LED = Pin(33, Pin.OUT)
buzzer = PWM(Pin(25, Pin.OUT))

#para declare
sensor_delay = 0.5


#object declare
reverse_sensor = HC_SR04.HCSR04(trigger_pin = TRIG, echo_pin = ECHO)


#main program
while True:
  distance_wall = reverse_sensor.distance_cm()
  print(f"The car is {distance_wall:.2f}cm from the wall.")

  if distance_wall <= 40:
        buzzer.init(freq=1000, duty=2)
        LED.on()
        sleep(0.05)
        buzzer.init(freq=1000, duty=0)
        LED.off()
        sleep(0.05)

  elif 41 <= distance_wall <= 100:
        buzzer.init(freq=1000, duty=10)
        LED.on()
        sleep(0.2)
        buzzer.init(freq=1000, duty=0)
        LED.off()
        sleep(0.2)

  elif 101 <= distance_wall <= 200:
        buzzer.init(freq=1000, duty=10)
        LED.on()
        sleep(0.5)
        buzzer.init(freq=1000, duty=0)
        LED.off()
        sleep(0.5)
      
  else:
        LED.off()
        buzzer.init(freq=1000, duty=0)
        sleep(sensor_delay)