//========= DHT22 Sensor ================//
#include <DHT.h>
const int DHTPIN = 12;
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);     // Membuat Object
float temperature;
float humidity;

//========= LDR Sensor ================//
const int LDRSensor = 32;
float intensitasCahaya;  //Lux

//========= PIR Motion Sensor ================//
const byte PIRSENSOR = 4;
bool motion;
String Smotion; 

//========== OLED Declaration ==========//
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

//========== RTC Declaration ==========//
#include <RTClib.h> 
RTC_DS3231 rtc;
String currentTime;


void setup() {
  Serial.begin(115200);
  
  // Initialize DHT sensor
  dht.begin();  
  pinMode(DHTPIN, INPUT);
  pinMode(LDRSensor, INPUT);
  pinMode(PIRSENSOR, INPUT);
  
  // Initialize OLED
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    while (true);  // Stop if OLED initialization fails
  }
  delay(2000);
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(25, 15);
  display.println("EDSPERT");
  display.setCursor(20, 40);
  display.println("BOOTCAMP");
  display.display();
  delay(2000);
  display.clearDisplay();

  // Initialize RTC
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (true);
  }

  // Sync RTC with compile time (Only run once to set time)
  if (rtc.lostPower()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  temperature = dht.readTemperature();       // Membaca nilai suhu
  humidity = dht.readHumidity();    // Membaca nilai kelembapan

  int nilaiADC = analogRead(LDRSensor);
  intensitasCahaya = intensitas(nilaiADC); // Conversi ADC ke Lux

  motion = digitalRead(PIRSENSOR);
  if(motion == 1){Smotion = "Detected";}
  else{Smotion = "Undetected";}

  Serial.print("Suhu : ");
  Serial.print(temperature);
  Serial.print("\tKelembapan : ");
  Serial.print(humidity);
  Serial.print("\tIntensitas : ");
  Serial.print(intensitasCahaya);
  Serial.print("\tObject : ");
  Serial.println(Smotion);

  delay(1000);

  DateTime now = rtc.now();
  currentTime = formatDateTime(now);

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);

  // Title
  display.setCursor(15, 0);
  display.print("NILAI PARAMETER");
  display.setCursor(15,3);
  display.print("_______________");


  // Temperature
  display.setCursor(8, 14);
  display.print("Temp : "); 
  display.print(temperature, 2); 
  display.print(" ");
  display.print((char)247);  // Degree symbol
  display.print("C");

  // Humidity
  display.setCursor(8, 24);
  display.print("Humi : "); 
  display.print(humidity, 2); 
  display.print(" %");

  // Light
  display.setCursor(8, 34);
  display.print("Light: "); 
  display.print(intensitasCahaya, 2); 
  display.print(" Lux");

  // Motion 
  display.setCursor(8, 44);
  display.print("Obj  : "); 
  display.print(motion ? "Detected" : "Undetected");

  // Current Time
  display.setCursor(5, 54);
  display.print(time);

  display.display();
}


//========= Format RTC Time =========//
String formatDateTime(DateTime now) {
  char buffer[20];
  sprintf(buffer, "%04d/%02d/%02d %02d:%02d:%02d", 
          now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second());
  return String(buffer);
}

//================  LDR Sensor ==========//
// Fungsi untuk mengconversi nilai ADC menjadi Intensitas
float intensitas(int adcValue){
  // These constants should match the photoresistor's "gamma" and "rl10" attributes
  const float GAMMA = 0.7;
  const float RL10 = 33;;
  // Convert the analog value into lux value:
  float voltage = adcValue / 4096. * 3.3;
  float resistance = 2000 * voltage / (1 - voltage / 3.3);
  float luxValue = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  return luxValue;
}