int
	
	 Led =
	
	 13
	
	 ;
	
	// define LED Interface
	
	
int
	
	 buttonpin =
	
	 10
	
	;
	
	 // define the key switch sensor interface
	
	
int
	
	 val ;
	
	// define numeric variables val
	
	
void
	
	 setup ()
	
	
{
	
	
  pinMode (
	
	Led,
	
	 OUTPUT)
	
	;
	
	 // define LED as output interface
	
	
  pinMode (
	
	buttonpin,
	
	 INPUT)
	
	;
	
	 // define the key switch sensor output interface
	
	
}
	
	
void
	
	 loop ()
	
	
{
	
	
  val =
	
	 digitalRead (
	
	buttonpin)
	
	;
	
	 // digital interface will be assigned a value of 3 to read val
	
	
    if
	
	 (
	
	val ==
	
	 HIGH)
	
	  // When the key switch when the sensor detects a signal, LED flashes
	
	
  {
	
	
    digitalWrite (
	
	Led,
	
	 HIGH)
	
	;
	
	
  }
	
	
  else
	
	
  {
	
	
    digitalWrite (
	
	Led,
	
	 LOW)
	
	;
	
	
  }
	
	
}