#define LED1 23
#define LED2 21
#define LED3 19
#define BUTTON 22

int bStatus = 0;
unsigned long bt = 0;

void setup() {
  Serial.begin(9600);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP); //  sd nội trở tránh floating state
  bt = millis(); // tương tự halgetick
}

void loop() {
  while(digitalRead(BUTTON) == 0) // an nut
  {
    if(millis() - bt > 100) // khu nhieu, chong rung
    {
      bStatus = bStatus + 1;
    }
    bt = millis();
  }
  if(bStatus % 3 == 0)
  {
    digitalWrite(LED1,LOW);
    delay(200);
    digitalWrite(LED2,LOW);
    delay(200);
    digitalWrite(LED3,LOW);
    delay(200);
  }
  else if(bStatus % 3 == 1)
  {
    digitalWrite(LED1,1);
    delay(200);
    digitalWrite(LED2,1);
    delay(200);
    digitalWrite(LED3,1);
    delay(200);
  }
  else if(bStatus % 3 == 2)
  {
    digitalWrite(LED1,1);
    digitalWrite(LED2,0);
    digitalWrite(LED3,0);
    delay(200);
    digitalWrite(LED1,0);
    digitalWrite(LED2,1);
    digitalWrite(LED3,0);
    delay(200);
    digitalWrite(LED1,0);
    digitalWrite(LED2,0);
    digitalWrite(LED3,1);
    delay(200);
  }
  
}