#define LED_RED 4
#define LED_GREEN 5

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:  
  if(millis() % 1000 < 500)
  {
   digitalWrite(LED_RED, HIGH);
  }
  else
  {
    digitalWrite(LED_RED, LOW);
  }
  if(millis() % 2000 < 1000)
  {
    digitalWrite(LED_GREEN, HIGH);
  }
  else
  {
    digitalWrite(LED_GREEN, LOW);
  }


}