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

#define DHTPIN 3       // Digital pin connected to DHT22
#define DHTTYPE DHT22  // DHT 22 (AM2302) sensor type
#define POT_PIN A3     // Analog pin connected to potentiometer

// Initialize the LCD with I2C address 0x27 (common for 20x4 LCDs with I2C module)
LiquidCrystal_I2C lcd(0x27, 20, 4);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  lcd.begin(16, 2);    // Initialize the LCD with 16 columns and 2 rows
  lcd.backlight();     // Turn on the backlight
  dht.begin();         // Initialize the DHT sensor
  Serial.begin(9600); 
}

void loop() {

  delay(1000);
  lcd.clear();

  // Read temperature and humidity from DHT22
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int potValue = analogRead(POT_PIN);

  // Check if readings failed and exit early to avoid displaying 'NaN'
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    char tempStr[7];
    char humiStr[7];

    dtostrf(temperature, 3, 2, tempStr);
    dtostrf(humidity, 3, 2, humiStr);
  }

  // Display Temperature and Humidity on LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print((char)223);
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");

  // Display Potentiometer value on LCD
  lcd.setCursor(0, 2);
  lcd.print("Pot. Val: ");
  lcd.print(potValue);

}