// Nattawut Sirakaw 116430205008-6
#define LED_1 15
#define LED_2 2
#define Delayms 500

void setup() 
{
  pinMode(LED_1, OUTPUT);
  pinMode(LED_2, OUTPUT);
}

void loop() 
{
  digitalWrite(LED_1, HIGH);
  digitalWrite(LED_2, HIGH);
  delay(Delayms);
  digitalWrite(LED_1,LOW);
  digitalWrite(LED_2,LOW);
  delay(Delayms);
  digitalWrite(LED_1, HIGH);
  delay(Delayms);
  digitalWrite(LED_1,LOW);
  delay(Delayms);
  digitalWrite(LED_2, HIGH);
  delay(Delayms);
  digitalWrite(LED_2,LOW);
  delay(Delayms);
}