byte teller =0;

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  do{
    digitalWrite(LED_BUILTIN, HIGH);
    delay(500);
    digitalWrite(LED_BUILTIN, LOW);
    delay(500);
    teller ++;
  }while (teller < 10);
teller = 0;
do{
    digitalWrite(LED_BUILTIN, HIGH);
    delay(1000);
    digitalWrite(LED_BUILTIN, LOW);
    delay(1000);
    teller ++;
  }while (teller < 10);
  while(1);
}