#include <LiquidCrystal_I2C.h>
#include <NewPing.h>

#define TRIG_PIN 2
#define ECHO_PIN 1
#define MAX_DISTANCE 200


#define LED1 13
#define LED2 12
#define LED3 11


NewPing sonar(TRIG_PIN, ECHO_PIN, MAX_DISTANCE);

LiquidCrystal_I2C lcd(0x27, 16, 2); 

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);

  Serial.begin(9600);
  lcd.begin(16, 2);  
  lcd.backlight();   
  
  lcd.setCursor(0, 0);
  lcd.print("Deteksi Ketinggian");
  lcd.setCursor(0, 1);
  lcd.print("Air/Banjir");
  delay(2000);  
}

void loop() {
  int distance = sonar.ping_cm();
  Serial.print("Jarak: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance >= 0 && distance <= 20) {  
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("Status: BANJIR");
    digitalWrite(LED1, HIGH);    
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);   
  } 
  else if (distance > 20 && distance <= 50) { 
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("Status: HATI-HATI");
    digitalWrite(LED1, LOW);     
    digitalWrite(LED2, HIGH); 
    digitalWrite(LED3, LOW);  
  } 
  else { 
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("Status: AMAN");
    digitalWrite(LED1, LOW);    
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, HIGH);  
  }

  delay(500);  
}