hw_timer_t *timer = NULL;
//Written by Chayathon Rungrueang 6530300082
void ARDUINO_ISR_ATTR onTimer() {
  static bool led3 = false;
  digitalWrite(16, led3);
  led3 = !led3;
}

int present = 0;
int state = 0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(2, OUTPUT); // LED 1
  pinMode(16, OUTPUT); // LED 2
  pinMode(17, OUTPUT); // LED 3
  pinMode(18, OUTPUT); // LED 4
  pinMode(19, OUTPUT); // LED 5

   digitalWrite(16, LOW);
  timer = timerBegin(1000000);  
  timerAttachInterrupt(timer, &onTimer);
  timerAlarm(timer, 100000, true, 0); // counter led1

}

//true
//false
void loop() {
  int future = millis();
  if(future - present >= 500)
  {
    
    present = future;
    if(state == 1)
    {
      digitalWrite(17,true); // LED3
      digitalWrite(2,false); // LED1
      digitalWrite(18,false); // LED4
      digitalWrite(19,false); // LED5
    }
    if(state == 2 ) 
    {

      digitalWrite(17,false); // LED3
      digitalWrite(2,true); // LED1
      digitalWrite(18,false); // LED4
      digitalWrite(19,false); // LED5
    }
    if(state == 3)
    {
      digitalWrite(17,true); // LED3
      digitalWrite(2,false); // LED1
      digitalWrite(18,true); // LED4
      digitalWrite(19,false); // LED5
    }
    if(state == 4)
    {
      digitalWrite(17,false); // LED3
      digitalWrite(2,true); // LED1
      digitalWrite(18,false); // LED4
      digitalWrite(19,false); // LED5

    }
    if(state == 5)
    {
      digitalWrite(17,true); // LED3
      digitalWrite(2,false); // LED1
      digitalWrite(18,false); // LED4
      digitalWrite(19,false); // LED5

    }
    if(state == 6)
    {
      digitalWrite(17,false); // LED3
      digitalWrite(2,true); // LED1
      digitalWrite(18,true); // LED4
      digitalWrite(19,true); // LED5
    }
    state++;

    if(state == 7)
    {
      state = 0;
    }
  }

}