#include <DHT.h>

#define DHTPIN 3     
#define DHTTYPE DHT22 

DHT dht(DHTPIN, DHTTYPE);
float temp;
float hum;
int relaypin = 4;

void setup() {
  dht.begin();
  Serial.begin(9600);
  pinMode(relaypin, OUTPUT);
  digitalWrite(relaypin, LOW); 
}

void loop() {
  temp = dht.readTemperature();
  hum = dht.readHumidity();
  
  Serial.print("Temperature: ");
  Serial.print(temp);
  Serial.println(" °C");

  Serial.print("Humidity: ");
  Serial.print(hum);
  Serial.println(" %");

  if (temp > 40 && hum < 50) {
    digitalWrite(relaypin, HIGH);
    Serial.println("Relay ON");
  } else {
    digitalWrite(relaypin, LOW);
    Serial.println("Relay OFF");
  }
  
  delay(1000);
}