// Import the required library to setup the LCD
#include <LiquidCrystal_I2C.h>

#define TRIG_PIN 18
#define ECHO_PIN 19
#define RED_LED 32
#define GREEN_LED 33

// Setup the LCD
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);

  // Initilize the display and display the intial message
  LCD.init();
  LCD.backlight();
  LCD.setCursor(1, 0);
  LCD.print("PARKING");
  LCD.setCursor(1, 1);
  LCD.print("ASSISTANT");
  delay(1000);
  LCD.clear();
}

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  
  int duration = pulseIn(ECHO_PIN, HIGH);
  int distance = duration * 0.034 / 2;

  if(distance > 50){
    digitalWrite(GREEN_LED, HIGH);
    digitalWrite(RED_LED, LOW);

  }else{
    digitalWrite(RED_LED, HIGH);
    digitalWrite(GREEN_LED, LOW);
  }


  // Display the distance
  LCD.setCursor(1, 0);
  LCD.print("Distance in CM");
  LCD.setCursor(7, 1);
  LCD.print(distance);

  // Wait for a moment before the next reading
  delay(200);
}