// works!

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



}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(13, HIGH);
digitalWrite(12, LOW);  // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(13, LOW);
digitalWrite(12, HIGH);  // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}