millis_and_finite_state_machine_micro_copy__copy_22052023

const int buttonPin = 8;
int last_button_value = HIGH;   // pin 2 is HIGH when button is not pressed
const int ledPin = 9;
uint8_t state=0 ;

void setup()
{
  pinMode( buttonPin, INPUT_PULLUP);
  pinMode( ledPin, OUTPUT);
}


void loop()
{

  bool buttonPressed = false;
bool buttonReleased = false;
  int button_value = digitalRead( buttonPin);

  if( button_value != last_button_value)
  {
    if( button_value == LOW)  // low is button pressed
    {
      buttonPressed = true;
    }
    else
    {
      buttonReleased = true;
    }
    last_button_value = button_value;
  }

  switch( state)
  {
    case 0:
    digitalWrite( ledPin, LOW);
    state = 1;
    break;

    case 1:
    if( buttonPressed)
      {
        state = 2;
      }
      break;

    case 2:
      digitalWrite( ledPin, HIGH);
       if( buttonPressed)
      {
       state = 3;
       }
      break;

    case 3:
     digitalWrite(9, (millis() / 500) % 2);
     if( buttonPressed)
     {
      state = 4;
     }
      break;

    case 4:
     digitalWrite(9, (millis() / 167) % 2);
      if( buttonPressed)
      {

        state = 5;
      }
      break;

      case 5:
     digitalWrite(9, (millis() / 34) % 2);
      if( buttonPressed)
      {

        state = 6;
      }
      break;

      case 6:
     digitalWrite(9, (millis() / 20) % 2);
      if( buttonPressed)
      {

        state = 7;
      }
      break;
      case 7:
     digitalWrite(9, (millis() / 8) % 2);
      if( buttonPressed)
      {

        state = 8;
      }
      break;
      case 8:
     digitalWrite(9, (millis() / 4) % 2);
      if( buttonPressed)
      {

        state = 0;
      }
      break;
  }
}