int a=0;
#define   LED_BUILTIN 12

void setup() {

 pinMode(LED_BUILTIN, OUTPUT);
  // put your setup code here, to run once:
 while(a<8){
  digitalWrite( LED_BUILTIN, HIGH);
  delay(2000);
  digitalWrite(LED_BUILTIN, LOW);
  delay(2000);
  a++;

  }
  
}

void loop() {
 
  
  
}