#include "DHT.h"  
#include "pitches.h"

#define DHPIN 2
#define DHTTYPE DHT22
#define BUZZER_PIN 10 
#define PUSH_BTN_PIN 7
#define LED_PIN 8
DHT dht(DHPIN,DHTTYPE);
int BTN_STATE = false; 

void setup() {
  Serial.begin(115200);
  Serial.println(F("DHT22 Example"));
  dht.begin();
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(PUSH_BTN_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);
}

void loop() { 

  // put your main code here, to run repeatedly:

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

if(isnan(temperature) || isnan(humidity)){
  Serial.println(F("Failed to read from DHT sensor"));
  return;
}else{
   
   
  if(digitalRead(PUSH_BTN_PIN) == true){ 
    BTN_STATE = !BTN_STATE;  
    digitalWrite(LED_PIN, BTN_STATE);
   // Serial.println(F("fire alarm off")); 
   // digitalWrite(BUZZER_PIN, LOW); 
  } 
  if((temperature > 40) && (BTN_STATE == false)){
    digitalWrite(LED_PIN, HIGH);
    Serial.println(F("fire alarm on")); 
    tone(BUZZER_PIN, NOTE_C4);
    digitalWrite(BUZZER_PIN, HIGH);
  }else{
    digitalWrite(LED_PIN, LOW);
    Serial.println(F("fire alarm off:fine temperature"));
    digitalWrite(BUZZER_PIN, LOW);
    noTone(BUZZER_PIN); 
  }
}
Serial.print(F("Humidity: "));
Serial.print(humidity);
Serial.print(F("% Temperature: "));
Serial.print(temperature);
Serial.println(F("C"));

delay(2000);
}