int buzzer = 8;
int LED = 7;
int flame_sensor = 4;
int flame_detected;

void setup()
{ 
 Serial.begin(9600); 
 pinMode(buzzer, OUTPUT);
 pinMode(LED, OUTPUT); 
 pinMode(flame_sensor, INPUT);
}

void loop()
{ 
 flame_detected = digitalRead(flame_sensor); 
 if (flame_detected == 1) 
 {    
  Serial.println("Flame detected...! take action immediately."); 
  digitalWrite(buzzer, HIGH);  
  digitalWrite(LED, HIGH);    
  delay(200);    
  digitalWrite(LED, LOW);    
   delay(200);  
 }  
else 
{    
  Serial.println("No flame detected. stay cool");       

  digitalWrite(buzzer, LOW); 
  digitalWrite(LED, LOW);  
  }  
  delay(1000);
}