Code (C++)

/*
Test with 5-pin Led+Push button.

Flash the LED every 1 s.
Read the button state and print to serial.

NB; needs an external pull down on pin 'pushButtonPin'. Works with 4.7k.
*/

// constants won't change. Used here to set a pin number:
const int ledPin = 5;					// the number of the LED pin
const int pushButtonPin = 6;
const long interval = 1000;				// interval at which to blink (milliseconds)

int ledState = LOW;						// ledState used to set the LED
unsigned long previousMillis = 0;       // will store last time LED was updated

void setup() {
	// set the digital pin as output:
	pinMode(ledPin, OUTPUT);
	pinMode(pushButtonPin, INPUT);

	Serial.begin(9600);
}

void loop() {
	// 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();

	// LED stuff
	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);
	}

	// Push button
	int buttonState = digitalRead(pushButtonPin);
	Serial.println(buttonState);
}