#define LED_INTERN 2
#define LED_BLINK_ON_MS 100
#define LED_BLINK_OFF_MS 2000

#define PORT_1 5
#define PORT_2 4
#define PORT_3 14
#define PORT_4 12
#define PORT_DELAY_MS 2000

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_INTERN, OUTPUT);
  pinMode(PORT_1, OUTPUT);
  pinMode(PORT_2, OUTPUT);
  pinMode(PORT_3, OUTPUT);
  pinMode(PORT_4, OUTPUT);
  
  delay(PORT_DELAY_MS);
  digitalWrite(PORT_1, HIGH);
  delay(PORT_DELAY_MS);
  digitalWrite(PORT_2, HIGH);
  delay(PORT_DELAY_MS);
  digitalWrite(PORT_3, HIGH);
  delay(PORT_DELAY_MS);
  digitalWrite(PORT_4, HIGH);
}

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

  digitalWrite(LED_INTERN, LOW);
  delay(LED_BLINK_ON_MS);
  digitalWrite(LED_INTERN, HIGH);
  delay(LED_BLINK_OFF_MS);
}