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

// Inisialisasi LCD I2C (alamat, jumlah kolom, jumlah baris)
LiquidCrystal_I2C lcd(0x27, 16, 2);

#define ldr_pin A0
#define button_pin 2
#define buzz 11
#define led_pin1 12
#define led_pin2 13

const float GAMMA = 0.7;
const float RL10 = 50;

int ldr_value, button_value;

void setup() {
  lcd.init();
  lcd.backlight();

  Serial.begin(9600);
  pinMode(ldr_pin, INPUT);
  pinMode(button_pin, INPUT);
  pinMode(led_pin1, OUTPUT);
  pinMode(led_pin2, OUTPUT);
  pinMode(buzz, OUTPUT);
  }

void loop() {
  ldr_value = analogRead(ldr_pin);
  button_value = digitalRead(button_pin);

  //Serial.println(button_value);
  float voltage = ldr_value / 1024.0 * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  Serial.println(lux);
  if(lux > 350) {
    lcd.setCursor(1, 1);
    lcd.print("ADA MALING!!!!!");
    digitalWrite(led_pin1, HIGH);
    digitalWrite(led_pin2, LOW);
    delay(1000);
    digitalWrite(led_pin1, LOW);
    digitalWrite(led_pin2, HIGH);
    delay(1000);
  }
  else{
    lcd.clear();
    digitalWrite(led_pin1, LOW);
    tone(buzz ,100, 1000);
  }
}