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

LiquidCrystal_I2C lcd(0x27, 20, 4);  

const int trigPin = 5; 
const int echoPin = 18; 
const int greenLedPin = 4; 
const int yellowLedPin = 2; 
const int redLedPin = 15; 

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);

  lcd.init();
  lcd.backlight();
}

void loop() {
  long duration, distance;
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  
  distance = (duration * 0.034) / 2;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  lcd.setCursor(0, 0);
  lcd.print("SENSOR BANJIR");
  lcd.setCursor(0, 1);
  lcd.print("POLJAN CIPARAY");
  lcd.setCursor(0, 2);
  lcd.print("CITARUM");
  lcd.setCursor(0, 3);

  if (distance >= 180) {
    digitalWrite(greenLedPin, HIGH);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(redLedPin, LOW);
    lcd.setCursor(0, 3);
    lcd.print("Status : Aman      ");
  } else if (distance >= 150 && distance < 180) {
    digitalWrite(greenLedPin, LOW);
    digitalWrite(yellowLedPin, HIGH);
    digitalWrite(redLedPin, LOW);
    lcd.setCursor(0, 3);
    lcd.print("Status : Siaga 1    ");
  } else if (distance >= 120 && distance < 150) {
    digitalWrite(greenLedPin, LOW);
    digitalWrite(yellowLedPin, HIGH); 
    digitalWrite(redLedPin, LOW);
    lcd.setCursor(0, 3);
    lcd.print("Status : Siaga 2    ");
  } else {
    digitalWrite(greenLedPin, LOW);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(redLedPin, HIGH); 
    lcd.setCursor(0, 3);
    lcd.print("Status : Siaga 3    ");
  }
  
  delay(1000);
}