#include <LiquidCrystal_I2C.h>
#define ECHO_PIN 2
#define TRIG_PIN 3
#define buzzer 4
#define ledmerah 13
#define ledkuning 12
#define ledhijau 11

LiquidCrystal_I2C lcd(0x27,20,4);

void setup(){
  pinMode(ledmerah, OUTPUT);
  pinMode(ledkuning, OUTPUT);
  pinMode(ledhijau, 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);
  
  lcd.setCursor(0,0);
  lcd.print("Detektor Banjir");
  lcd.setCursor(5,1);
  lcd.print("oleh");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Khaeldro");
  lcd.setCursor(0,1);
  lcd.print(" YOOOO ");
  delay(3000);
  digitalWrite(ledmerah, LOW);
  digitalWrite(ledkuning, LOW);
  digitalWrite(ledhijau, 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 loop(){
  float kdln = kedalaman();
  if(kdln > 370){
    digitalWrite(ledmerah, HIGH);
    digitalWrite(ledkuning, LOW);
    digitalWrite(ledhijau, LOW);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Kdlm: ");
    lcd.print(kdln);
    lcd.setCursor(7,0);
    lcd.print("cm");
    lcd.setCursor(0,1);
    lcd.print("Status: Bahaya");
    tone(4,800,1000);
    delay(1000);
    lcd.clear();
    delay(100);
  } else if(kdln >= 320 && kdln < 370){
    digitalWrite(ledmerah, LOW);
    digitalWrite(ledkuning, HIGH);
    digitalWrite(ledhijau, LOW);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Kdlm: ");
    lcd.print(kdln);
    lcd.setCursor(7,0);
    lcd.print("cm");
    lcd.setCursor(0,1);
    lcd.print("Status: Siaga");
    delay(1000);
    lcd.clear();
    delay(100);
  } else {
    digitalWrite(ledmerah, LOW);
    digitalWrite(ledkuning, LOW);
    digitalWrite(ledhijau, HIGH);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Kdlm: ");
    lcd.print(kdln);
    lcd.setCursor(7,0);
    lcd.print("cm");
    lcd.setCursor(0,1);
    lcd.print("Status: Aman");
    delay(1000);
    lcd.clear();
    delay(100);
  }
}