const int Switch=4;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(2, OUTPUT);
  pinMode(12, OUTPUT);
  //
  pinMode(Switch, INPUT);
}

void loop() {
  int a=digitalRead(Switch);
  Serial.println(a);
  if(a==1){
  digitalWrite(12 ,HIGH);
  digitalWrite(2, HIGH);
  delay(300);
  digitalWrite(12 , LOW);
  digitalWrite(2, LOW);
  delay(300);
}
else
  digitalWrite(12 , LOW);
  Serial.println("0");
}