Blink the LED on and off with 500 ms time delay using Arduino UNO board.

 

Program:

int led = 13;

// the setup routine runs once when you press reset:

void setup() {

 // initialize the digital pin as an output.

 pinMode(led, OUTPUT);

}

// the loop routine runs over and over again forever:

void loop() {

 digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)

 delay(1000); // wait for a second

 digitalWrite(led, LOW); // turn the LED off by making the voltage LOW

 delay(1000); // wait for a second

}