#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); 
int triggerPin = 2; 
int echoPin = 3;   
int greenLedPin = 4;
int redLedPin = 5;

long totalDistance = 0;

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
}

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

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

  totalDistance += distance;

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Current Dist: ");
  lcd.print(distance);
  lcd.print(" cm");

  lcd.setCursor(0, 1);
  lcd.print("Total Dist: ");
  lcd.print(totalDistance);
  lcd.print(" cm");

  if (distance > 100) {
    digitalWrite(greenLedPin, HIGH);
  } else {
    digitalWrite(greenLedPin, LOW); 
  }

  if (totalDistance > 300) {
    digitalWrite(redLedPin, HIGH);
  } else {
    digitalWrite(redLedPin, LOW);
  }

  delay(500);
}