#include <LiquidCrystal_I2C.h>

#define LCD_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2

LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLUMNS, LCD_ROWS);

int ledm = 13;
int ledy = 12;
int ledj = 11;
int buzzer = 10;
int potpin = A0;
int value;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(ledm, OUTPUT);
pinMode(ledy, OUTPUT);
pinMode(ledj, OUTPUT);
pinMode(buzzer, OUTPUT);
pinMode(potpin, INPUT);

 lcd.begin(16,2);
  lcd.init();
  lcd.backlight();

  lcd.setCursor(5,0);
  lcd.print("WASPADA");

  lcd.setCursor(0,4);
  lcd.print(" ADA ANJING GLK ");
}

void loop() {
  // put your main code here, to run repeatedly:
value = analogRead(potpin);
tone(buzzer, value);
if(value > 200){
  digitalWrite(ledj, HIGH); 
}
else{
  digitalWrite(ledj, LOW);
}
if(value > 400){
  digitalWrite(ledy, HIGH);  
}
else{
  digitalWrite(ledy, LOW);
}
if(value > 800){
  digitalWrite(ledm, HIGH);  
}
else{
  digitalWrite(ledm, LOW);
}
if (value < 800) {
    lcd.noBacklight(); // Matikan backlight jika nilai di bawah ambang
  } else {
    lcd.backlight();   // Hidupkan backlight jika nilai di atas ambang
  }

  delay(100); // Delay untuk menghindari flickeri
}