#define LED 13
long int x;

void setup() {
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
  x = millis();
}
void loop() {
  if(x + 1000 < millis()){
    digitalWrite(LED, HIGH);
  }
    if(x + 2000 < millis()){
    digitalWrite(LED, HIGH);
    x = millis();
  }
  Serial.print("*");
  }