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The basic blink program

//This is the basic blink program.

int ledPin = 13; // LED connected to digital pin 13

// The setup() method runs once, when the sketch starts

void setup() {

// initialize the digital pin as an output:

pinMode(ledPin, OUTPUT);

}

// the loop() method runs over and over again,

// as long as the Arduino has power

void loop()

{

digitalWrite(ledPin, HIGH); // set the LED on

delay(100); // wait for a second

digitalWrite(ledPin, LOW); // set the LED off

delay(1000); // wait for a second

}