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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int trigger = 9;   
const int echo = 10;   
const int buzzer = 11; 
const int ledm = 13;
const int ledk = 4;
const int ledh = 3;



void setup() {
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(ledm, OUTPUT);
  pinMode(ledk, OUTPUT);
  pinMode(ledh, OUTPUT);
  Serial.begin(9600); 


  lcd.init();      // Initialize the LCD
  lcd.backlight(); // Turn on the backlight
 
}

void buzzer_dangkal(){
  tone(buzzer, 200);
  delay(500);
  tone(buzzer, 200);
  delay(500);
  tone(buzzer, 200);
  delay(500);
  noTone(buzzer);
}
void buzzer_cukup(){
  tone(buzzer, 100);
  delay(500);
  tone(buzzer, 100);
  delay(500);
  tone(buzzer, 100);
  delay(500);
  noTone(buzzer);
}
void buzzer_waspada(){
  tone(buzzer, 500);
  delay(500);
  tone(buzzer, 500);
  delay(500);
  tone(buzzer, 500);
  delay(500);
  noTone(buzzer);
}
void buzzer_bahaya(){
  tone(buzzer, 1000);
  delay(500);
  tone(buzzer, 1000);
  delay(500);
  tone(buzzer, 1000);
  delay(500);
  noTone(buzzer);
}

void loop() {
  digitalWrite(trigger, LOW);
  delayMicroseconds(5);
  digitalWrite(trigger, HIGH);
  delayMicroseconds(13);
  digitalWrite(trigger, LOW);
  long duration = pulseIn(echo, HIGH);
  long kedalaman = (duration * 0.0343) / 2;
  lcd.setCursor(0, 0);
  lcd.print("Kedalaman: ");
  lcd.print(kedalaman);
  lcd.print("cm");
  lcd.setCursor(0, 1);
  lcd.print("Status: ");


  if(kedalaman > 100){
    digitalWrite(ledh, LOW);
    digitalWrite(ledk, LOW);
    digitalWrite(ledm, HIGH);
   
  }
  else if(kedalaman < 100 && kedalaman > 50){
    digitalWrite(ledh, LOW);
    digitalWrite(ledk, HIGH);
    digitalWrite(ledm, LOW);
   
  }
  else if(kedalaman < 50 && kedalaman > 20){
    digitalWrite(ledk, LOW);
    digitalWrite(ledh, HIGH);
    digitalWrite(ledm, LOW);
   lcd.setCursor(8, 1);
    lcd.print("Dangkal ");
    buzzer_dangkal();
    delay(100);
  }
   else if(kedalaman <=20){
    digitalWrite(ledk, LOW);
    digitalWrite(ledh, LOW );
    digitalWrite(ledm, LOW);
}
}