Here is a simple demostration of led chaser using ARDUINO 

ATMEGA328PU MICROCONTROLLER(ARDUINO)


PROGRAM

void setup() {

   pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
}

 // the loop function runs over and over again forever
void loop() {
  digitalWrite(2, HIGH);   // turn the LED on (HIGH is the voltage level)
delay(200);//wait 200 milli seconds
  digitalWrite(2, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(3, HIGH); 
  delay(200);           
  digitalWrite(3, LOW); 


  digitalWrite(4, HIGH); 
  delay(200);           
  digitalWrite(4, LOW); 

  digitalWrite(5, HIGH); 
  delay(200);           
  digitalWrite(5, LOW); 


    digitalWrite(6, HIGH); 
  delay(200);           
  digitalWrite(6, LOW); 


  digitalWrite(7, HIGH);               
  delay(200);
digitalWrite(7, LOW);

   digitalWrite(8, HIGH); 
  delay(200);
         digitalWrite(8, LOW); 

   digitalWrite(9, HIGH);
           delay(200);
      digitalWrite(9, LOW);

 }