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

#define DHT_pin 4
#define DHT_type DHT22
DHT dht(DHT_pin,DHT_type);

#define I2C_ADDR 0x27
#define LCD_columns 16 
#define LCD_lines 2

#define LDR_pin 25 
#define LED_pin 34
#define sw1 D2


LiquidCrystal_I2C lcd(I2C_ADDR, LCD_columns, LCD_lines);

float ADC_value = 0.0048828125;

void setup() {
  
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  pinMode(LDR_pin,INPUT);
  dht.begin();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.println("Hello, ESP32!");
}

void loop() {
  temp();
  delay(3000);
  humi();
  delay(3000);
  ldr();
  delay(3000);
}

void temp(){
  float temperture = dht.readTemperature();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Temp = "+String(temperture));
}

void humi(){
  float humidity = dht.readHumidity();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("humi = "+String(humidity));
}

void ldr(){
  float ldr_data = analogRead(LDR_pin);
  int lux = int((250.000000/(ADC_value*ldr_data))-50.000000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("ldr =");
  lcd.print(lux);
}