void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
pinMode(13,OUTPUT);
pinMode(12,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(13, HIGH);
digitalWrite(12, HIGH);
Serial.println("light on");
delay(500);
digitalWrite(13, LOW);
digitalWrite(12, LOW);
Serial.println("light off");
delay(500);
}