Fritzing

This is very simple project with arduino in witch u make LED blink. 

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Conect LEDs anode to arduino pin 13 and cathode to arduino GND pin.

Code is very simple:

 

void setup() {

Serial.begin(9600); // Start serial monitor

pinMode(13, OUTPUT); // set pin 13 as output pin

}

void () {

digitalWrite(13, HIGH); //set pin 13 as high pin

Serial.write("LED: on"); //write on serial monitor that led is on

delay(500);  //wait half of second

digitalWrite(13, LOW);  //set pin 13 as low pin

Serial.write("LED: off"); //write on serial monitor that led is off

delay(500); //wait half of second again

}