// will quickly become a bigger number than can be stored in an int.

long interval = 1000;

// interval at which to blink (milliseconds)

void setup() {

// set the digital pin as output:

pinMode(ledPin, OUTPUT);

}

void loop()

{

// here is where you'd put code that needs to be running all the time.

// check to see if it's time to blink the LED; that is, if the

// difference between the current time and last time you blinked

// the LED is bigger than the interval at which you want to

// blink the LED.

unsigned long currentMillis = millis();

if(currentMillis - previousMillis > interval) {

// save the last time you blinked the LED

previousMillis = currentMillis;

// if the LED is off turn it on and vice-versa:

if (ledState == LOW)

ledState = HIGH;

else

ledState = LOW;

// set the LED with the ledState of the variable:

digitalWrite(ledPin, ledState);

}

}

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