void setup() {
  // put your setup code here, to run once:
pinMode(LED_BUILTIN, OUTPUT);
pinMode(12, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  LED_BILNK();
}

void LED_BILNK() {
  digitalWrite(12, HIGH);
  delay(1000);
  digitalWrite(12,LOW);
  delay(1000);
}