#include "DHT.h" 
#define DHTPIN 5 
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
float temp;
float hum;
int led = 3;
void setup(){
  dht.begin();
  Serial.begin(9600);
  pinMode(led, OUTPUT);
}

void loop() {
  temp = dht.readTemperature();
  Serial.print("temp: ");
  Serial.print(temp);
  Serial.print("'C ");
  Serial.println(" ");
  delay(1000);
  if (temp >= 30) {
    digitalWrite(led, HIGH);
  }
  else {
    digitalWrite(led, LOW);
  }
}