Blink

This program is about

• Turns on an LED on for one second, then off for one second, repeatedly.

Important - Most Arduinos have an on-board LED you can control. On the Uno and

                  Leonardo, it is attached to digital pin 13. If you're unsure what

                  pin the on-board LED is connected to on your Arduino model, check

                  the documentation.

According to the above selection set a LED(+ pin) to 13th pin of the arduino board. Then it's (-) pin should connect arduino board ground port.

void setup() {  // initialize digital pin 13 as an output.

  pinMode(13, OUTPUT);

}

void loop() {// the loop function runs over and over again forever

  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)

  delay(1000);              // wait for a second

  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW

  delay(1000);              // wait for a second

}

Write this code in compiler. Then verify -> Upload.

• the setup function runs once when you press reset or power the board.

After upload code to the arduino. You will see the blinking LED.