#include <LiquidCrystal_I2C.h>

#define TRIG_PIN 3
#define ECHO_PIN 2 
#define BUZZER_PIN 7
#define redLED_PIN 6
#define greenLED_PIN 4 

LiquidCrystal_I2C lcd(0x27, 16, 2);


void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
Serial.println(" Ultrasonic Sensor Initialized");

pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
pinMode(BUZZER_PIN, OUTPUT);
pinMode(redLED_PIN, OUTPUT);
pinMode(greenLED_PIN, OUTPUT);

lcd.init();
lcd.backlight();

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);

  long duration = pulseIn(ECHO_PIN, HIGH);
  int distance = duration * 0.034 /2;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  lcd.setCursor(0, 2);
  if (distance < 10 ) {
    Serial.println("Status: Low Water level");
    lcd.print("Status: Low");
    digitalWrite(greenLED_PIN, HIGH);
    digitalWrite(redLED_PIN, LOW);
    tone(BUZZER_PIN, 1500, 500);
  } else {
    Serial.println("Status: High Water Level");
    lcd.print("Status: High");
    digitalWrite(redLED_PIN, HIGH);
    digitalWrite(greenLED_PIN, LOW);
    tone(BUZZER_PIN, 1000, 500);
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(" WAN ANUAR IMAN ");
 
  lcd.setCursor(0, 1);
  lcd.print("Water level: ");
  lcd.print(distance);
  lcd.print(" cm");

  delay(2000);

}