In this chapter, you will learn how to get the LED to flash on an Arduino board. This is one of the simplest projects that you can undertake.
// this runs only once on power upvoidsetup(){pinMode(13,OUTPUT);}// the loop function runs continuously until the device is powered downvoidloop(){digitalWrite(13,HIGH);// turn on LEDdelay(1000);// wait for a seconddigitalWrite(13,LOW);// turn off LEDdelay(1000);// wait for a second}