//Example from String to Int https://www.arduino.cc/en/Tutorial/StringToIntExample
void setup() {
  // initialize serial:
  Serial.begin(4800);
   pinMode(13, OUTPUT);


}
String inString = "";
int b = 0;
void loop() {
if (Serial.available()>0)
  {

      int inChar = Serial.read();
    if (isDigit(inChar)) {
      // convert the incoming byte to a char
      // and add it to the string:
      inString += (char)inChar;
    }
    // if you get a newline, print the string,
    // then the string's value:
    if (inChar == '\n') {
      Serial.print("Value:");
      Serial.println(inString.toInt());
      b = inString.toInt();
      Serial.print("String: ");
      Serial.println(inString);
      // clear the string for new input:
      inString = "";
    }

    }
    if(b>5){
      Serial.println("LIGHT");
    digitalWrite(13,HIGH);}
    else{
    digitalWrite(13,LOW);

  }

}