#include "DHT.h"
#define  DHTPIN 4
#define DHTTYPE DHT22 

DHT dht(DHTPIN, DHTTYPE);
int led = 2;
int buzzer = 3;

void setup() {
Serial.begin(9600);
Serial.println(F("Contoh Penggunaan Sensor DHT22!"));
dht.begin();
pinMode(led, OUTPUT);
pinMode(buzzer, OUTPUT);
}

void loop() {
float temperature = dht.readTemperature();
float humidity = dht.readHumidity();

Serial.print(F("Humidity: "));
Serial.print(humidity);
Serial.print(F("% Temperature: ")); Serial.print(temperature);
Serial.println(F("C"));

// Wait a few seconds between measurements.
delay(2000);

  if (temperature <21){ 
    digitalWrite(led, HIGH);
    digitalWrite(buzzer, HIGH);
    delay(1000);
  }

  if(temperature >21){
    digitalWrite(led, LOW);
  }
}