/* Program 2-1: Toggling a pin 
*/
const int Pin5 = 5;         /* Pin5 */

void setup() {
    pinMode(Pin5, OUTPUT);   /* set pin 5 as output */
}	

void loop() {
    digitalWrite(Pin5,HIGH); /* turn on the pin 5 */
    delay(750);             /* delay 750 ms */
    digitalWrite(Pin5,LOW);  /* turn off the pin 5 */
    delay(750);             /* delay 750 ms */
}