#include "DHTesp.h"
#define DHTTYPE DHT22
#define LDR_PIN 4
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd (0x27,20,4);

const int DHT_PIN = 12;

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

DHTesp dhtSensor;

void setup () {
 
Serial.begin(115200);


dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

pinMode(LDR_PIN, INPUT);

lcd.init();
lcd.backlight();
}

void loop() {
 
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
  delay(1000);

  int analogValue = analogRead(4);
  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.println("Date: 22/8/2022");
 delay(2000);
  lcd.setCursor(0,1);
lcd.println("Time: 9:30 PM");
delay(2000);
 
  lcd.setCursor(2, 2);
  lcd.print("Room: ");
  if (lux > 50) {
    lcd.print("Light!");
  } else {
    lcd.print("Dark  ");
  }

  lcd.setCursor(2, 3);
  lcd.print("Lux: ");
  lcd.print(lux);
  lcd.print("          ");

  delay(100);
}