int pin2 = 2;

void setup()  
{  
    pinMode(2, OUTPUT); // Set pin 2 as OUTPUT
}  

void loop()  
{  
     digitalWrite(2, HIGH); // Turn on the LED on pin 2
    delay(1000);            // Wait for 1 second
    
    digitalWrite(2, LOW);   // Turn off the LED on pin 2
    delay(1000);            // Wait for 1 second
}