void setup() {
  // put your setup code here, to run once:
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(12, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(9, HIGH); delay(500);
  digitalWrite(9, LOW); delay(500);
  digitalWrite(10, HIGH); delay(500);
  digitalWrite(10, LOW); delay(500);
  digitalWrite(12, HIGH); delay(500);
  digitalWrite(12, LOW); delay(500);
}