Using the Pmod LED with Arduino Uno

/************************************************************************
*
* Test of the Pmod LED
*
*************************************************************************
* Description: Pmod_LED
* LEDs light successively one after the other,
* and then turn off.
*
* Material
* 1. Arduino Uno
* 2. Pmod LED
*
************************************************************************/

void setup()
{
for (int i=2; i<=5; i++) // configuration of pins 2 to 5 in output
 {
pinMode(i,OUTPUT);
 }
}

void loop()
{
for(int i = 2; i<=5; i++) // 4 LEDs turn on
 {
digitalWrite(i,HIGH);
delay(250);
 }
for(int i = 2; i<=5; i++) // 4 LEDs turn off
  {
digitalWrite(i,LOW);
  }
delay(250);
}