#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <RTClib.h>

RTC_DS3231 myRTC;

#define DHTPIN 14
#define DHTTYPE DHT22
#define LDRPIN 33
DHT dhtku(DHTPIN,DHTTYPE);

LiquidCrystal_I2C lcdKita(0x27, 16, 2);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  dhtku.begin();
  myRTC.begin();
  lcdKita.init(); 
  lcdKita.backlight();
  splashScreen();

  myRTC.adjust(DateTime(F(__DATE__), F(__TIME__)));
}

void loop() {
  // put your main code here, to run repeatedly:
  DateTime now = myRTC.now();
  int tahun = now.year();
  int bulan = now.month();
  int tanggal = now.day();
  int jam = now.hour();
  int menit = now.minute();
  int detik = now.second();

  float temp = dhtku.readTemperature();
  float hum = dhtku.readHumidity();

  // Membaca Sensor LDR
  float adcLdr = analogRead(LDRPIN);
  float lux = adc2Lux(adcLdr);

  tampilkan(tahun,bulan,tanggal,jam,menit,detik,temp,hum,lux);
  
}

void tampilkan(int year, int month, int day, int hour, int minute, int second, float t, float h, float l){
  lcdKita.setCursor(0,0);
  lcdKita.print("Date: ");
  lcdKita.print(year);
  lcdKita.print("/");
  lcdKita.print(month);
  lcdKita.print(":");
  lcdKita.print(day);

  lcdKita.setCursor(0,1);
  lcdKita.print("Time: ");
  lcdKita.print(hour);
  lcdKita.print(":");
  lcdKita.print(minute);
  lcdKita.print(":");
  lcdKita.print(second);
  delay(2000);
  lcdKita.clear();
  
  lcdKita.setCursor(0,0);
  lcdKita.print("T:");
  lcdKita.print(t);

  lcdKita.setCursor(8,0);
  lcdKita.print("H:");
  lcdKita.print(h);

  lcdKita.setCursor(3,1);
  lcdKita.print("L:");
  lcdKita.print(l,2);
  delay(3000); // this speeds up the simulation
  lcdKita.clear();
}


void splashScreen(){
  lcdKita.setCursor(5,0);
  lcdKita.print("EDSPERT");
  delay(3000);
  lcdKita.clear();

  lcdKita.setCursor(5,0);
  lcdKita.print("SYSTEM");
  lcdKita.setCursor(3,1);
  lcdKita.print("MONITORING");
  delay(3000);
  lcdKita.clear();
}


float adc2Lux(int adcValue){
  const float GAMMA = 0.7;
  const float RL10 = 33;
  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;
}