#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

#define pin_PIR1 13
#define pin_LDR 32
#define pin_Buzzer 12
#define pin_LED 23

int status_PIR1 = LOW;
int nilai_PIR1 = 0;

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


// Fungsi aktifasi komponen Buzzer
void buzzer_Aktif(int val){
  if (val == 1) {
    // Buzzer berbunyi
    tone(pin_Buzzer, 150); 
  } else if (val == 0){
    // Buzzer mati
    noTone(pin_Buzzer);
  }   
}

// Fungsi aktifasi Sensor PIR 1
void sensor_PIR1(){
  // Baca data dari sensor PIR 1
  nilai_PIR1 = digitalRead(pin_PIR1); 
  // Jika objek terdeteksi 
  if (nilai_PIR1 == HIGH) {        
    if (status_PIR1 == LOW) {
      Serial.println("Sensor PIR 1 Mendeteksi Gerakan");      
      buzzer_Aktif(1);
      status_PIR1 = HIGH;
    }
  // Jika objek tidak terdeteksi
  } else { 
    if (status_PIR1 == HIGH) {
      Serial.println("Sensor PIR 1 Tidak Mendeteksi Gerakan");
      buzzer_Aktif(0);      
      status_PIR1 = LOW;
    }
  }
}

// Fungsi aktifasi Sensor LDR
void sensor_LDR(){  
  int analogValue = analogRead(pin_LDR);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  lcd.setCursor(0, 0);
  lcd.print("Cahaya: ");
  if (lux > 100) {
    lcd.print("Terang");
    digitalWrite(pin_LED, LOW);
  } 
  else {
    lcd.print("Gelap  ");
    digitalWrite(pin_LED, HIGH);
  }

  lcd.setCursor(0, 1);
  lcd.print("Lux: ");
  lcd.print(lux);
  lcd.print("          ");
  
  delay(100);
}

void setup() {
  Serial.begin(115200);
  
  // Konfigurasi PIN Output
  pinMode(pin_Buzzer, OUTPUT);
  pinMode(pin_LED, OUTPUT);

  // Konfigurasi PIN Input
  pinMode(pin_PIR1, INPUT);
  pinMode(pin_LDR, INPUT); 

  // Konfigurasi LCD output
  lcd.init();
  lcd.backlight();


  // Kondisi awal LED mati
  digitalWrite(pin_LED, LOW);  
}

void loop() {
  sensor_PIR1();
  sensor_LDR();  
}