int mode=0;
int zone_1=2;
int zone_2=3;
int zone_3=4;
int zone_4=5;
int zone_5=6;
int zone_6=7;
int zone_7=8;
int zone_8=9;
int zone_9=10;
int zone_10=11;
int zone_11=12;
int zone_12=13;

int area1=A0;
int area2=A1;
int area3=A2;
int area4=A3;

int buzzer=A4;


void setup() {
  pinMode(A0, INPUT_PULLUP);
  pinMode(A1, INPUT_PULLUP);
  pinMode(A2, INPUT_PULLUP);
  pinMode(A3, INPUT_PULLUP);
  
  for(int i=2;i<=13;i++)
  {
  pinMode(i,OUTPUT);
  }
  design();
  design();
  design();
  design();

}

void loop() {
  int state_A0=digitalRead(A0);
  int state_A1=digitalRead(A1);
  int state_A2=digitalRead(A2);
  int state_A3=digitalRead(A3);

  if(state_A0== LOW){mode=1;}
  if(state_A1== LOW){mode=2;}
  if(state_A2== LOW){mode=3;}
  if(state_A3== LOW){mode=4;}
  

  if(mode==1){fire_zone1();}
  else{digitalWrite(13,LOW);}
   if(mode==2){digitalWrite(12,HIGH);}
  else{digitalWrite(12,LOW);}
   if(mode==3){digitalWrite(11,HIGH);}
  else{digitalWrite(11,LOW);}
   if(mode==4){digitalWrite(10,HIGH);}
  else{digitalWrite(10,LOW);}
}
void fire_zone1()
 {
  for (int i=500;i <=5000;i+100){
  tone(buzzer,i);
  delay(100);
  }
  }