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

#define DHTPIN 8
#define DHTTYPE DHT22
#define LED_PIN 6 // Define the digital pin connected to the LED

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);
  Serial.println("Temperature Monitoring System");
  lcd.begin(16, 2);
  dht.begin();

  pinMode(LED_PIN, OUTPUT);   // Configure the LED pin as an output
  digitalWrite(LED_PIN, LOW); // Ensure the LED is initially turned OFF
}

void loop() {
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  delay(1000);

  //Displays on LCD
  lcd.setCursor(0, 0);
  lcd.println("Temp="); lcd.print(t); lcd.println("C");
  lcd.setCursor(0, 1);
  lcd.println("Humidity="); lcd.print(h); lcd.println("%");

  //Display on serial monitor screen
  Serial.print("Temp= "); Serial.print(t); Serial.println(" C");
  Serial.print("Humidity= "); Serial.print(h); Serial.println(" %");

  // The LED is activated whenever the measured temperature exceeds 30°C.

  if (t > 30) {
    digitalWrite(LED_PIN, HIGH);
  }
  else {
    digitalWrite(LED_PIN, LOW);
  }
}