#define FLAME_SENSOR 34   
#define GAS_SENSOR   35   
#define ALERT_PIN    21

void setup() {
  pinMode(FLAME_SENSOR, INPUT);
  pinMode(GAS_SENSOR, INPUT);
  pinMode(ALERT_PIN, OUTPUT);
  Serial.begin(115200);
}

void loop() {
  int flame = digitalRead(FLAME_SENSOR);
  int gas   = digitalRead(GAS_SENSOR);

  if (flame == 1 || gas == 1) {  
    
    digitalWrite(ALERT_PIN, 1); 
    delay(300);
    digitalWrite(ALERT_PIN, 0);  
    delay(300);
    Serial.println(" Danger! Flame or Gas Detected!");
  } else {
    digitalWrite(ALERT_PIN, 0);  
    Serial.println(" Safe: No Flame, No Gas");
  }
}