#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#include "RTClib.h"
#define SERIAL_OPTION 0
#define LDR_PIN 2
#define DHTPIN 2
#define DHTTYPE DHT22

byte led1 = 3, led2 = 4, led3 = 5;

// LDR Characteristics
const float GAMMA = 0.7;
const float RL10 = 50;

LiquidCrystal_I2C lcd(0x27, 20, 4);
DHT dht(DHTPIN, DHTTYPE);

RTC_DS1307 rtc;




void setup() {
  pinMode(LDR_PIN, INPUT);

  lcd.clear();
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  dht.begin();
}

void loop() {

  DateTime time = rtc.now();
  int analogValue = analogRead(A0);
  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, 1);
  lcd.print(time.hour());
  lcd.print(":");
  lcd.print(time.minute());
  lcd.setCursor(7, 1);
  lcd.print("L:");
  lcd.print(lux);



  float t = dht.readTemperature();
  if (isnan(t)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  lcd.setCursor(0, 0);
  lcd.print(t);
  lcd.print("C");


  if (t >= 25) {
    digitalWrite(led1, 1);
  };
  if (lux >= 500) {
    digitalWrite(led2, 1);
  };
  if (time.hour() >14) {
    digitalWrite(led3, 1);
  };

  delay(100);
}