#include<DHT.h>

#define DHTPIN 8
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);
void setup() {
  // put your setup code here, to run once:
  pinMode(3, OUTPUT);
  Serial.begin(9600);
  delay(1000);
  Serial.println("DHT22 Test");
  dht.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
delay(2000);

float humidity=dht.readHumidity();
float temperature=dht.readTemperature();

if(isnan(humidity) || isnan(temperature)) {
  Serial.println("Failed to read from DHT sensor!");
    return;
}
if(temperature>45) {
  analogWrite(3,200);//here 200 value is freq value which must be between 0-255
  }
else{
  analogWrite(3, 0);
}
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C");
}
//DHT - DIGITAL TEMPERATURE AND HUMIDITY
//TWO MODELS SENSOR AVAILABLE - DHT11, DHT22
//VCC - EITHER 5V OR 3.3V OR VIN PIN(IF AVAILABLE)
//SDA - SERIAL DATA ANALYSIS
//GND - GROUND PIN (ANY OF THREE)