#include <Arduino.h>

int pin = 3;

void setup() {
  pinMode(pin, OUTPUT);
}

void loop() {
  digitalWrite(pin, HIGH);   
  delay(100);               
  digitalWrite(pin, LOW);    
  delay(100);      
  digitalWrite(pin, HIGH);   
  delay(500);               
  digitalWrite(pin, LOW);    
  delay(500);                 
}