void setup() {

  pinMode(13, OUTPUT);
  pinMode(12, INPUT);
  Serial.begin(9600);
}


void loop() {
  int value = 0;
    String input = "";
  while(Serial.available() > 0)
  {
    input += (char) Serial.read();
    delay(5);
  }

  if(input == "on")
    digitalWrite(13, HIGH);
  else if (input == "off")
    digitalWrite(13, LOW);
  value = digitalRead(12);
  Serial.println(value);


}