#define LED_Pin 2

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_Pin, OUTPUT);
  
  digitalWrite(LED_Pin, HIGH);
  delay(3000);//3000ms
  digitalWrite(LED_Pin, LOW);
  delay(3000);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(LED_Pin, HIGH);
  delay(500);
  digitalWrite(LED_Pin, LOW);
  delay(500);
}