#define  led 13 
#define   led2 11 






void setup() {
  pinMode(led, OUTPUT);
  pinMode(led2, OUTPUT);
}

void loop() {
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led2, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
  delay(1000);
  digitalWrite(led2, LOW);
  delay(1000);
}