int ledPin = 2; // LED connected to pin 4
void setup() {
	pinMode(ledPin, OUTPUT); //Pin 13 is set as OUTPUT
} 
void loop() {
 	digitalWrite(ledPin, HIGH); // set the LED ON
 	delay(1000); // wait for a second 
 	digitalWrite(ledPin, LOW); // set the LED OFF
 	delay(1000); // wait for a second
 }