const int Switch=34;
void setup() {
  Serial.begin(115200);
 pinMode(26, OUTPUT);
 pinMode(27, OUTPUT);
 pinMode(12, OUTPUT);
 pinMode(34, OUTPUT);
pinMode(Switch, INPUT);
}

void loop() {
  int a=digitalRead(Switch);
  if(a==1){
   digitalWrite(34, HIGH);
   delay(1000); 
   digitalWrite(34, LOW);
   delay(1000);
  digitalWrite(26,HIGH);
  delay(2000);
  digitalWrite(26,LOW);
  digitalWrite(27,HIGH);
  delay(2000);
  digitalWrite(27,LOW);
  digitalWrite(12,HIGH);
  delay(2000);
  digitalWrite(12,LOW);
  digitalWrite(27,HIGH);
  delay(2000);
  digitalWrite(27,LOW);
 }
 else{
 digitalWrite(34, LOW);
}
}