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

#define Trig_Pin 2
#define Echo_Pin 4
#define Buzzer 5
#define LED_PIN3 14
#define LED_PIN2 12
#define LED_PIN 13

float duration_us, distance_cm, m;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
    
  pinMode(Trig_Pin, OUTPUT);
  pinMode(Echo_Pin, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(LED_PIN2, OUTPUT);
  pinMode(LED_PIN3, OUTPUT);
  pinMode(Buzzer, OUTPUT);

  lcd.init();                      
  lcd.backlight();                
  
}
void loop() {
  
  digitalWrite(Trig_Pin, HIGH);
  delay(10); 
  digitalWrite(Trig_Pin, LOW);
  
  duration_us = pulseIn(Echo_Pin, HIGH);
  distance_cm = 0.017 * duration_us;
  m = distance_cm/100;

  lcd.setCursor(0, 0);
  lcd.print("kedalaman: " + String(m, 2) +"m");
    
  if (distance_cm < 70) {
    Serial.println("AMAN");
    digitalWrite(LED_PIN3, HIGH);
    digitalWrite(LED_PIN2, LOW);
    digitalWrite(LED_PIN, LOW);
    noTone(Buzzer);
    lcd.setCursor(0,1);
    lcd.print("Status : Aman  ");
  }
    
  if (distance_cm >= 70 && distance_cm < 150){
    Serial.println("SIAGA");
    digitalWrite(LED_PIN3, LOW);
    digitalWrite(LED_PIN2, HIGH);
    digitalWrite(LED_PIN, LOW);
    noTone(Buzzer);
    lcd.setCursor(0,1);
    lcd.print("Status : Siaga ");
  }
    
  if (distance_cm > 150) {
    Serial.println("BAHAYA");
    digitalWrite(LED_PIN3, LOW);
    digitalWrite(LED_PIN2, LOW);
    digitalWrite(LED_PIN, HIGH);
    tone(Buzzer,800);
    delay(500);
    noTone(Buzzer);
    lcd.setCursor(0,1);
    lcd.print("Status : Bahaya");
  }
    
  Serial.print("kedalaman air: ");
  Serial.print(m);
  Serial.println("m");

  delay(500);
}