#include <LiquidCrystal_I2C.h>

#define ECHO_PIN 2
#define TRIG_PIN 3
#define buzzer 4
#define ledmerah 13
#define ledkuning 12
#define ledhijau 11
#define ledputih 10
#define ledbiru 9

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  pinMode(ledmerah, OUTPUT);
  pinMode(ledkuning, OUTPUT);
  pinMode(ledhijau, OUTPUT);
  pinMode(ledputih, OUTPUT);
  pinMode(ledbiru, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(buzzer, OUTPUT);

  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

  digitalWrite(ledmerah, HIGH);
  digitalWrite(ledkuning, HIGH);
  digitalWrite(ledhijau, HIGH);
  digitalWrite(ledputih, HIGH);
  digitalWrite(ledbiru, HIGH);
  tone(4,300,500);
  lcd.setCursor(0,0);
  lcd.print(" PngkrPntuAirDpk");
  lcd.setCursor(5,1);
  lcd.print("oleh");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("   Tio Andrew");
  lcd.setCursor(0,1);
  lcd.print(" Univ Siber Asia");
  delay(3000);
  digitalWrite(ledmerah, LOW);
  digitalWrite(ledkuning, LOW);
  digitalWrite(ledhijau, LOW);
  digitalWrite(ledputih, LOW);
  digitalWrite(ledbiru, LOW);
  digitalWrite(buzzer, LOW);
  lcd.clear();
}

float kedalaman() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int durasi = pulseIn(ECHO_PIN, HIGH);

  return 400-durasi * 0.034 / 2;
}

void updateDisplay(int kdlm, int status) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Kdlmn :");
  lcd.setCursor(7, 0);
  lcd.print(kdlm);
  lcd.setCursor(14, 0);
  lcd.print("cm");
  lcd.setCursor(0, 1);
  lcd.print("Status :");
  lcd.setCursor(9, 1);

  switch (status) {
    case 5:
      lcd.print("Siaga 4");
      digitalWrite(ledmerah, HIGH);
      digitalWrite(ledkuning, LOW);
      digitalWrite(ledhijau, LOW);
      digitalWrite(ledputih, LOW);
      digitalWrite(ledbiru, LOW);
      tone(4, 800, 1000);
      delay(1000);
      break;

    case 4:
      lcd.print("Siaga 3");
      digitalWrite(ledmerah, LOW);
      digitalWrite(ledkuning, HIGH);
      digitalWrite(ledhijau, LOW);
      digitalWrite(ledputih, LOW);
      digitalWrite(ledbiru, LOW);
      delay(1000);
      break;

    case 3:
      lcd.print("Siaga 2");
      digitalWrite(ledmerah, LOW);
      digitalWrite(ledkuning, LOW);
      digitalWrite(ledhijau, HIGH);
      digitalWrite(ledputih, LOW);
      digitalWrite(ledbiru, LOW);
      delay(1000);
      break;
 
    case 2:
      lcd.print("Siaga 1");
      digitalWrite(ledmerah, LOW);
      digitalWrite(ledkuning, LOW);
      digitalWrite(ledhijau, LOW);
      digitalWrite(ledputih, HIGH);
      digitalWrite(ledbiru, LOW);
      delay(1000);
      break; 
    default:
      lcd.print("Aman");
      digitalWrite(ledmerah, LOW);
      digitalWrite(ledkuning, LOW);
      digitalWrite(ledhijau, LOW);
      digitalWrite(ledputih, LOW);
      digitalWrite(ledbiru, HIGH);
      delay(1000);
      break;      
  }

  lcd.clear();
  delay(100);
}

void loop() {
  float kdlm = kedalaman();

  if (kdlm > 370) {
    updateDisplay(kdlm, 5);
  } else if (kdlm >= 320 && kdlm < 370) {
    updateDisplay(kdlm, 4);
  } else if (kdlm >= 270 && kdlm < 320) {
    updateDisplay(kdlm, 3);
  } else if (kdlm >= 220 && kdlm < 270) {
    updateDisplay(kdlm, 2);
  } else {
    updateDisplay(kdlm, 1);
  }
}