//Library
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

//Inisialisai variabel
int ldrPin = A0; 
int ledPin = 2; 
int ledPin2 = 4;
int ledPin3 = 5;  
const float GAMMA = 0.7; 
const float RL10 = 50; 
#define pirPin 3
#define buzzer 10
int statusPir = LOW;
int gerakanPir; 

Servo myservo;
int sudut;

int pos = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2); 

void setup() {
  myservo.attach(9);
  // put your setup code here, to run once:
  pinMode(ledPin, OUTPUT); 
  pinMode(ledPin2, OUTPUT); 
  pinMode(ledPin3, OUTPUT); 
  lcd.init(); 
  lcd.backlight(); 
  pinMode(pirPin, INPUT); 
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT); 
  pinMode(buzzer, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int ldrValue = analogRead(ldrPin); 
  float voltase = ldrValue / 1024. * 5; 
  float resistansi = 2000 * voltase / (1-voltase / 5); 
  float kecerahan = pow(RL10 * 1e3 * pow(10, GAMMA) / resistansi, (1/GAMMA)); 

//LCD menampilkan nilai sesuai dengan kondisi
  lcd.setCursor(0, 0); 
  lcd.print("Cahaya: "); 

//jika nilai >50 maka kondisi dalam keadaan terang dan LED akan mati
  if(kecerahan > 50){ 
    lcd.print("Terang"); 
    digitalWrite(ledPin, LOW);
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin3, LOW);

//jika nilai <=250 maka kondisi dalam keadaan gelap dan LED akan menyala
  }if (kecerahan <= 250){
    lcd.print("Gelap");
    digitalWrite(ledPin, HIGH);
    digitalWrite(ledPin2, HIGH);
    digitalWrite(ledPin3, HIGH);

  }
  
//kode stup LCD
  lcd.setCursor(0, 1); 
  lcd.print("Lux: ");
  lcd.print(kecerahan);
  lcd.print("     ");

  delay(100);
  gerakanPir = digitalRead(pirPin); 

//jika terdeteksi gerakan LED akan meyala secara berkedip dan Buzzer akan berbunyi
  if(gerakanPir==HIGH){ 
    tone(buzzer, 10);
    digitalWrite(ledPin, HIGH);
    digitalWrite(ledPin3, HIGH);
    digitalWrite(ledPin2, HIGH);

//jika Undeteksi maka LED dan Buzzer akan mati
    if(statusPir==LOW){ 
      Serial.println("Ada Gerakan!!!"); 
      statusPir=HIGH; 
    }
  }
  else { 
    digitalWrite(ledPin, LOW);
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin3, LOW); 
    if(statusPir==HIGH){ 
      noTone(buzzer);
      Serial.println("Tidak Ada Gerakan!"); 
      statusPir=LOW;
    }
  }
  
}