/* Program 1-3: Toggling LED
 * 
 */
const int LED = 13;         /* LED */
const int mydelay = 750;   /* delay size */

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

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