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

void loop() {
  int switchcase = digitalRead(4);
  if ( switchcase ==1 )
  {

    digitalWrite(12,HIGH);
  }
  else{
    digitalWrite(12, LOW);
  }
  }