#define led1 5
#define led2 12


void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);

}

void loop() {
  digitalWrite(led1, HIGH);
  delay(500);
  digitalWrite(led2, LOW);
  delay(500);

  digitalWrite(led1, LOW);
  delay(500);
  digitalWrite(led2, HIGH);
  delay(500);
  

}