void setup()
{
  pinMode(12, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(2, OUTPUT);
}

void loop()
{
  digitalWrite(12, HIGH);
  digitalWrite(8, LOW);
  digitalWrite(2, LOW);
  delay(150); // Wait for 150 millisecond(s)
  digitalWrite(12, LOW);
  digitalWrite(8, HIGH);
  digitalWrite(2, LOW);
  delay(150); // Wait for 150 millisecond(s)
  digitalWrite(12, LOW);
  digitalWrite(8, LOW);
  digitalWrite(2, HIGH);
  delay(150); // Wait for 150 millisecond(s)
}