int led_do=2;
int led_xanh=4;
int led_vang=7;
void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600);
 pinMode(led_do, OUTPUT);
 pinMode(led_xanh, OUTPUT);
 pinMode(led_vang, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  for (int i= 0; i<10; i++)
  {
    digitalWrite(led_xanh, HIGH);
    delay(500);
    digitalWrite(led_xanh, LOW);
    delay(500);
  }
  for (int i= 0; i<10; i++)
  {
    digitalWrite(led_do, HIGH);
    delay(500);
    digitalWrite(led_do, LOW);
    delay(500);
  }
  for (int i= 0; i<5; i++)
  {
    digitalWrite(led_vang, HIGH);
    delay(500);
    digitalWrite(led_vang, LOW);
    delay(500);
  }
}