#define LED_2 2 //LED_2 Pin D2
#define LED_3 4 //LED_3 Pin D4
#define LED_4 5 //LED_4 Pin D5
#define DelayMS 250 //0.5 วินาที

void setup() 
{
  pinMode(LED_2, OUTPUT); 
  pinMode(LED_3, OUTPUT);
  pinMode(LED_4, OUTPUT);
}

void loop() 
{
  digitalWrite(LED_2, HIGH);
  digitalWrite(LED_3, HIGH);
  digitalWrite(LED_4, HIGH);
  delay(DelayMS);
  digitalWrite(LED_2, LOW);
  digitalWrite(LED_3, LOW);
  digitalWrite(LED_4, LOW);
  delay(DelayMS);

  digitalWrite(LED_2, LOW);
  delay(DelayMS);
  digitalWrite(LED_2, HIGH);
  delay(DelayMS);
  digitalWrite(LED_3, LOW);
  delay(DelayMS);
  digitalWrite(LED_3, HIGH);
  delay(DelayMS);
  digitalWrite(LED_4, LOW);
  delay(DelayMS);
  digitalWrite(LED_4, HIGH);
  delay(DelayMS);

  digitalWrite(LED_4, LOW);
  delay(DelayMS);
  digitalWrite(LED_3, LOW);
  delay(DelayMS);
  digitalWrite(LED_2, LOW);
  delay(DelayMS);

  digitalWrite(LED_2, HIGH);
  digitalWrite(LED_3, HIGH);
  digitalWrite(LED_4, HIGH);
  delay(DelayMS);
  digitalWrite(LED_2, LOW);
  digitalWrite(LED_3, LOW);
  digitalWrite(LED_4, LOW);
  delay(DelayMS);

  digitalWrite(LED_2, HIGH);
  digitalWrite(LED_3, HIGH);
  digitalWrite(LED_4, HIGH);
  delay(DelayMS);
  digitalWrite(LED_2, LOW);
  digitalWrite(LED_3, LOW);
  digitalWrite(LED_4, LOW);
  delay(1000);
}