#include "DHT.h"

#define DHTPIN 2     // What pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
#define Led 4

int maxTemp = 27;

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(Led, OUTPUT);
  Serial.begin(9600); 
  dht.begin();
}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);
  
  // Read temperature as Celsius
  float t = dht.readTemperature();
  // Check if any reads failed and exit early (to try again).
  // isnan = If signal is not a number
  if (isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  if(t > maxTemp) {
      digitalWrite(Led, HIGH);
  } else {
     digitalWrite(Led, LOW); 
  }
  Serial.print("Temperature: "); 
  Serial.print(t);
  Serial.println(" °C ");
}