In the last example - http://www.mikroblog.net/arduino/arduino-basics/more-arduino-and-led-examples.php we showed you some examples of flashing multiple LEDs, now this code worked OK but there is a more efficient way of doing the same action. We use loops to initialize the LEDs and then again for switching the LEDs on...
LED
In the first basic tutorial we showed a couple of simple LED examples, here is another couple to try A reminder of the schematic if you need it [caption.