#include <DHT.h>
#define DHTPIN 4     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22 
#define led 2
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));
  dht.begin();
  pinMode(led, OUTPUT);
}

void loop() {
  delay(2000);
  float t = dht.readTemperature();
  float hic = dht.computeHeatIndex(t, false);
  Serial.print(F("Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  if(t>40){
    digitalWrite(led, HIGH);
  }
  else digitalWrite(led, LOW);
}