#include<DHT.h>
#include<Adafruit_Sensor.h>
#define DHTPIN 2 // what digital pin we're connected to
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);
const int led=10;
void setup() {
Serial.begin(9600);
dht.begin();
pinMode(led, OUTPUT);
}
void loop() {
// Wait a few seconds between measurements.
delay(2000);
float h = dht.readHumidity();
float t = dht.readTemperature();
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) ) {
Serial.println("Failed to read from DHT sensor!");
return;
}
if(t>20){
  digitalWrite(led, HIGH);
}
else{
  digitalWrite(led, LOW);
}
Serial.print("H");
Serial.print(h);
Serial.print(" %\t");
Serial.print("T");
Serial.print(t);
Serial.println(" *C ");
}