#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#define DHTPIN 2 
#define DHTTYPE DHT22  
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 24, 4);
const float GAMMA = 0.7;
const float RL10 = 50;
const int ledPin = 8;
void setup() {
  pinMode(ledPin, OUTPUT);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  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));
  if(lux<400){
    digitalWrite(ledPin, HIGH);
  } else{
    digitalWrite(ledPin, LOW);
  }
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  Serial.print("Освітленість: ");
  Serial.print(lux);
  Serial.println(" lux ");
  Serial.print("Вологість: ");
  Serial.print(h);
  Serial.print(" %  Температура: ");
  Serial.print(t);
  Serial.println(" °C ");
  lcd.setCursor(0, 0);
  lcd.print("T: ");
  lcd.print(t);
  lcd.print(" C ");
  lcd.setCursor(0, 1);
  lcd.print("H: ");
  lcd.print(h);
  lcd.print(" % ");
  lcd.setCursor(0, 2);
  lcd.print("P: ");
  lcd.print(lux);
  lcd.print(" lux");
  delay(2000);
}