void
	
	 setup ()
	
	
{
	
	
   pinMode (
	
	13
	
	,
	
	 OUTPUT)
	
	;
	
	 // define the digital output interface 13 feet
	
	
}
	
	
void
	
	 loop ()
	
	 {
	
	
   digitalWrite (
	
	13
	
	,
	
	 HIGH)
	
	;
	
	 // open the laser head
	
	
   delay (
	
	1000
	
	)
	
	;
	
	 // delay one second
	
	
   digitalWrite (
	
	13
	
	,
	
	 LOW)
	
	;
	
	 // turn off the laser head
	
	
   delay (
	
	1000
	
	)
	
	;
	
	 // delay one second
	
	
}