#include<DHT.h>

#define DHT_PIN 2        
#define DHT_TYPE DHT22

DHT dht(DHT_PIN, DHT_TYPE);
int Buzer_Pin = 13;


void setup() {
  pinMode(Buzer_Pin,OUTPUT);
   dht.begin();          
}

void loop() {
  static unsigned long lastSensorRead = 0;

  if (millis() - lastSensorRead > 2000) {
    float temperature = dht.readTemperature();
    if(temperature>=40)
    {
      tone(Buzer_Pin,1000);
    }
    else{
      noTone(Buzer_Pin);
    }
    lastSensorRead = millis();
}
}