void setup() {
  // put your setup code here, to run once:

  pinMode(0, OUTPUT);
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:

  for(unsigned char i = 0; i < 3; i++)
  {
    digitalWrite(i, HIGH);
    delay(1000);
    digitalWrite(i, LOW);
    delay(1000);
  }

}